CN104954052A - Multiple-input multiple-output antenna transmitting-receiving circuit - Google Patents
Multiple-input multiple-output antenna transmitting-receiving circuit Download PDFInfo
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- CN104954052A CN104954052A CN201410123855.3A CN201410123855A CN104954052A CN 104954052 A CN104954052 A CN 104954052A CN 201410123855 A CN201410123855 A CN 201410123855A CN 104954052 A CN104954052 A CN 104954052A
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Abstract
The invention discloses a multiple-input multiple-output antenna transmitting-receiving circuit, and the circuit comprises a radio frequency transmitter and a plurality of transmitting-receiving units. Each transmitting-receiving unit comprises an antenna, a power amplifier, a low-noise amplifier, a first switching unit, and a second switching unit. The power amplifier is used for the power amplification of a to-be-transmitted signal outputted by the radio frequency transmitter, so as to transmit the to-be-transmitted signal. The low-noise amplifiers are used for the amplification of radio frequency signals received by the antennas, so as to transmit the radio frequency signals to a radio frequency transceiver. The first switching units and the second switching units are used for switching a transmitting path according to the transmitting-receiving state of the radio frequency transceiver. The circuit is additionally provided with the switching units so as to achieve the switching of the transmitting path, thereby achieving the isolation of the transmitting path with a receiving path, effectively inhibiting harmonic interference generated between the transmitting path and the receiving path, and improving the isolation degree of adjacent antennas.
Description
Technical field
The present invention relates to multi-input/output antenna transmission circuit, particularly relate to a kind of switch that utilizes to increase the multi-input/output antenna transmission circuit of isolation between antennas.
Background technology
In multi-input/output antenna transmission circuit, usual meeting arranges the transmit/receive switch being used for switching transmission path and RX path at the receiving terminal of antenna, because transmit/receive switch cannot reach the requirement of high-isolation usually, when radio-frequency (RF) transceiver via power amplifier transmission when radiofrequency signal is to antenna, the radiofrequency signal transmitted can be coupled to RX path and produce damage to low noise amplifier or radio-frequency (RF) transceiver, simultaneously because multi-input/output antenna transmission circuit exists multiple antenna, also there is radiated interference each other in multiple antenna, and then affect the transmitting power of antenna.Therefore, it can improve radiofrequency signal coupled interference to design a kind of multi-input/output antenna transmission circuit, and promoting antenna transmission power becomes a large research topic.
Summary of the invention
In view of this, need provide a kind of multi-input/output antenna transmission circuit, it can improve radiofrequency signal coupled interference, promotes the transmitting power of antenna.
Embodiment of the present invention provides a kind of multi-input/output antenna transmission circuit, comprises radio-frequency (RF) transceiver and multiple Transmit-Receive Unit, and each Transmit-Receive Unit includes antenna, power amplifier, low noise amplifier, the first switch element and second switch unit.Described power amplifier is electrically connected on described radio-frequency (RF) transceiver, and the signal to be transmitted for exporting described radio-frequency (RF) transceiver carries out power amplification to be gone out by described antenna transmission.Described low noise amplifier is electrically connected on described radio-frequency (RF) transceiver, and the radiofrequency signal for receiving described antenna amplifies to be sent to described radio-frequency (RF) transceiver.Described first switch element comprises common port, first end and the second end, described common port is electrically connected on described antenna, described first end is electrically connected on described power amplifier, for selecting to connect described antenna and described power amplifier according to the reiving/transmitting state of described radio-frequency (RF) transceiver, or described antenna and described low noise amplifier.Described second switch unit comprises common port, first end and the second end, described common port is electrically connected on the second end of described first switch element, described first end is electrically connected on described low noise amplifier, described second end ground connection, for selecting according to the reiving/transmitting state of described radio-frequency (RF) transceiver the second end connecting described low noise amplifier and described first switch element, or connect the second end and the earth terminal of described first switch element.
Preferably, described power amplifier also comprises enable pin, for controlling the running status of described power amplifier according to the reiving/transmitting state of radio-frequency (RF) transceiver, when described radio-frequency (RF) transceiver is in emission state, described power amplifier is in running order, second end of described first switch element and described earth terminal conducting, when described radio-frequency (RF) transceiver is in accepting state, described power amplifier is in resting state, the second end of described first switch element and described low noise amplifier conducting.
Preferably, described second switch unit comprises the first electric capacity, the second electric capacity, diode, inductance, resistance and the 3rd electric capacity.Described first electric capacity one end be electrically connected on described first switch element the second end.Described second electric capacity one end is electrically connected on the other end of described first electric capacity, and the other end is electrically connected on described low noise amplifier.Described diode cathode is electrically connected on the common port of described first electric capacity and described second electric capacity, minus earth.Described inductance one end is electrically connected on the common port of described first electric capacity and described second electric capacity.Described resistance one end is electrically connected on the other end of described inductance, and the other end is electrically connected on described radio-frequency (RF) transceiver.Described 3rd electric capacity, one end is electrically connected on the common port of described inductance and described resistance, other end ground connection.
Embodiment of the present invention provides a kind of multi-input/output antenna transmission circuit, comprises radio-frequency (RF) transceiver and multiple Transmit-Receive Unit, and each Transmit-Receive Unit includes antenna, power amplifier, low noise amplifier, the first switch element and second switch unit.Described power amplifier is electrically connected on described radio-frequency (RF) transceiver, and the signal to be transmitted for exporting described radio-frequency (RF) transceiver carries out power amplification to be gone out by described antenna transmission.Described low noise amplifier is electrically connected on described radio-frequency (RF) transceiver, and the radiofrequency signal for receiving described antenna amplifies to be sent to described radio-frequency (RF) transceiver.Described first switch element comprises common port, first end and the second end, described common port is electrically connected on described antenna, described first end is electrically connected on described power amplifier, described second end is electrically connected on described low noise amplifier, for selecting to connect described antenna and described power amplifier according to the reiving/transmitting state of described radio-frequency (RF) transceiver, or described antenna and described low noise amplifier.Described second switch unit comprises common port, first end and the second end, described common port is electrically connected on described low noise amplifier, described first end is electrically connected on described radio-frequency (RF) transceiver, described second end ground connection, for selecting to connect described low noise amplifier and described radio-frequency (RF) transceiver according to the reiving/transmitting state of described radio-frequency (RF) transceiver, or connect described low noise amplifier and earth terminal.
Preferably, described power amplifier also comprises enable pin, for controlling the running status of described power amplifier according to the reiving/transmitting state of radio-frequency (RF) transceiver, when described radio-frequency (RF) transceiver is in emission state, described power amplifier is in running order, and described low noise amplifier and described earth terminal conducting, when described radio-frequency (RF) transceiver is in accepting state, described power amplifier is in resting state, described low noise amplifier and described radio-frequency (RF) transceiver conducting.
Preferably, described second switch unit comprises the first electric capacity, the second electric capacity, diode, inductance, resistance and the 3rd electric capacity.Described first electric capacity one end is electrically connected on described low noise amplifier.Described second electric capacity one end is electrically connected on the other end of described first electric capacity, and the other end is electrically connected on described radio-frequency (RF) transceiver.Described diode cathode is electrically connected on the common port of described first electric capacity and described second electric capacity, minus earth.Described inductance one end is electrically connected on the common port of described first electric capacity and described second electric capacity.Described resistance one end is electrically connected on the other end of described inductance, and the other end is electrically connected on described radio-frequency (RF) transceiver.Described 3rd electric capacity one end is electrically connected on the common port of described inductance and described resistance, other end ground connection.
Above-mentioned multi-input/output antenna transmission circuit carries out transceiver path switching by setting up switch element, realize isolation transmission path and RX path, restrained effectively the humorous wave interference that transmission path and RX path produce each other, improve isolation between antennae simultaneously, and then improve transmitting power and the transmission range of antenna.
Accompanying drawing explanation
Fig. 1 is the module map in multi-input/output antenna transmission circuit one execution mode of the present invention.
Fig. 2 is the module map in another execution mode of multi-input/output antenna transmission circuit of the present invention.
Fig. 3 is the circuit diagram in multi-input/output antenna transmission circuit one execution mode in Fig. 1.
Fig. 4 is the circuit diagram in multi-input/output antenna transmission circuit one execution mode in Fig. 2.
Main element symbol description
Multi-input/output antenna transmission circuit 100,100a, 100b, 100c
Radio-frequency (RF) transceiver 10
Transmit-Receive Unit 20a, 20b, 20c
Power amplifier 202
Low noise amplifier 204
First switch element 206,206a
Second switch unit 208,208a
Antenna 210
Single-pole double-throw switch (SPDT) SW1
First to the 3rd electric capacity C1, C2, C3
Diode D1
Inductance L 1
Resistance R1
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Fig. 1 is the module map of multi-input/output antenna transmission circuit 100 in an embodiment of the present invention.In the present embodiment, multi-input/output antenna transmission circuit 100 comprises radio-frequency (RF) transceiver 10 and multiple Transmit-Receive Unit 20a, 20b, 20c (in the present embodiment, only for three, but be not limited with three, can comprise be less than or more than three Transmit-Receive Units), to realize transmitting or the reception of multiple signals.Each Transmit-Receive Unit 20a, 20b, 20c include power amplifier 202, low noise amplifier 204, first switch element 206, second switch unit 208 and antenna 210.Power amplifier 202 is electrically connected on radio-frequency (RF) transceiver 10, and the signal to be transmitted that power amplifier 202 radio frequency transceiver 10 exports carries out power amplification to be launched by antenna 210.Low noise amplifier 204 is electrically connected on radio-frequency (RF) transceiver 10, and the radiofrequency signal that low noise amplifier 204 pairs of antennas 210 receive amplifies to be sent to radio-frequency (RF) transceiver 10.First switch element 206 comprises common port, first end and the second end, the common port of the first switch element 206 is electrically connected on antenna 210, the first end of the first switch element 206 is electrically connected on power amplifier 202, first switch element 206 is selected to connect antenna 210 and power amplifier 202 according to the reiving/transmitting state of radio-frequency (RF) transceiver 10, or connect antenna 210 and low noise amplifier 204, thus select current transmission path to be transmission path or be RX path.Second switch unit 208 comprises common port, first end and the second end, the common port of second switch unit 208 is electrically connected on the second end of the first switch element 206, the first end of second switch unit 208 is electrically connected on low noise amplifier 204, second end ground connection of second switch unit 208, second switch unit 208 selects according to the reiving/transmitting state of radio-frequency (RF) transceiver 10 the second end connecting low noise amplifier 204 and the first switch element 206, or connects the second end and the earth terminal of the first switch element 206.
It should be noted that, in the present embodiment, first switch element 206 all has isolation effect with second switch unit 208, first switch element 206 and second switch unit 208 can be used to the signal to be transmitted after the amplification that isolated power amplifier 202 exports, and avoid high-power signal to be transmitted be coupled to the input of low noise amplifier 204 and damage radio-frequency (RF) transceiver 10.When radio-frequency (RF) transceiver 10 is in emission state, first switch element is connected power amplifier 202 and is launched by antenna 210 with signal to be transmitted radio-frequency (RF) transceiver 10 exported with antenna 210, simultaneously the common port of second switch unit 208 and its second end conducting, make the second end and the earth terminal conducting of the first switch element 206.
For example, when only having two Transmit-Receive Units 20a, 20b to be in emission state in three Transmit-Receive Units 20a, 20b, 20c, the first switch element 206 that now Transmit-Receive Unit 20a, 20b comprises connects power amplifier 202 and antenna 210, the first switch element 206 that Transmit-Receive Unit 20c comprises disconnects the connection of power amplifier 202 and antenna 210, and the second switch unit 208 that Transmit-Receive Unit 20a, 20b, 20c comprise connects the second end and the earth terminal of the first switch element 206.Multi-input/output antenna transmission circuit 100 makes multi-input/output antenna transmission circuit 100 when emission state by second switch unit 208 conducting ground connection, even if the antenna 210 that the Transmit-Receive Unit 20c that existence is not carried out launching can comprise through it receives other Transmit-Receive Units 20a, the radiofrequency signal that 20b launches, also ground can be conducting to by the second switch unit 208 in Transmit-Receive Unit 20c, thus avoid Transmit-Receive Unit 20a, 20b, interference is mutually there is between 20c, promote the peak power output of antenna 210, and then improve transmitting range and the efficiency of transmission of antenna 210, also radiofrequency signal Transmit-Receive Unit 20c can being avoided to receive is sent to the input of low noise amplifier 204 and damages radio-frequency (RF) transceiver 10.In other execution modes of the present invention, when multi-input/output antenna transmission circuit 100 comprises the Transmit-Receive Unit of more than four, its operation principle is identical with three Transmit-Receive Units 20a, 20b, 20c, so no longer describe in detail.
It should be noted that, low noise amplifier 204 can adjust according to side circuit layout with the electrical connection of second switch unit 208, Fig. 2 is in another embodiment of the present invention, the electrical connection of low noise amplifier 204 and second switch unit 208, its operation principle is similar to second switch unit 208 to the low noise amplifier 204 in Fig. 1, so no longer describe in detail.
Fig. 3 is the circuit diagram of multi-input/output antenna transmission circuit 100b in an embodiment of the present invention.In the present embodiment, the circuit framework of Transmit-Receive Unit 20a, 20b, 20c is all identical with operation principle, therefore is only described in detail with Transmit-Receive Unit 20a below.Transmit-Receive Unit 20a comprises power amplifier 202, low noise amplifier 204, first switch element 206a, second switch unit 208a and antenna 210.Power amplifier 202 comprises enable pin, be used for controlling according to the reiving/transmitting state of radio-frequency (RF) transceiver 10 running status of power amplifier 202, when radio-frequency (RF) transceiver 10 is in emission state, the enable pin of power amplifier 202 is high level, power amplifier 202 is in running order, second end of the first switch element 206a is connected with earth terminal, when radio-frequency (RF) transceiver 10 is in accepting state, the enable pin of power amplifier 202 is low level, power amplifier 202 is in resting state, second end of the first switch element 206a is connected with low noise amplifier 204.
In the present embodiment, the first switch element 206a is single-pole double-throw switch (SPDT) SW1, and single-pole double-throw switch (SPDT) SW1 comprises common port, first end and the second end.The common port of single-pole double-throw switch (SPDT) SW1 is electrically connected on antenna 210, the first end of single-pole double-throw switch (SPDT) SW1 is electrically connected on power amplifier 202, second end of single-pole double-throw switch (SPDT) SW1 is electrically connected on second switch unit 208, and multi-input/output antenna transmission circuit 100a carries out the switching of transmission path and RX path by single-pole double-throw switch (SPDT) SW1.In other execution modes of the present invention, the first switch element 206a also can be transistor switch, or other have the switch module of single-input double-output.
Second switch unit 208a comprises the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, diode D1, inductance L 1 and resistance R1.One end of first electric capacity C1 is electrically connected on second end of single-pole double-throw switch (SPDT) SW1.One end of second electric capacity C2 is electrically connected on the other end of the first electric capacity C1, and the other end of the second electric capacity C2 is electrically connected on low noise amplifier 204.The positive pole of diode D1 is electrically connected on the common port of the first electric capacity C1 and the second electric capacity C2, the minus earth of diode D1.Inductance L 1 one end is electrically connected on the common port of the first electric capacity C1 and the second electric capacity C2.One end of resistance R1 is electrically connected on the other end of inductance L 1, and the other end of resistance R1 is electrically connected on the common port of radio-frequency (RF) transceiver 10 and power amplifier 202 enable pin.One end of 3rd electric capacity C3 is electrically connected on the common port of inductance L 1 and resistance R1, the other end ground connection of the 3rd electric capacity C3.
For example, when Transmit-Receive Unit 20a is in emission state, the enable pin of power amplifier 202 is high level, diode D1 conducting, the other end ground connection of the first electric capacity C1, thus isolate the interference of low noise amplifier 204 and power amplifier 202, other are not in the Transmit-Receive Unit 20b of emission state simultaneously, the first electric capacity C1 that the radiofrequency signal that 20c receives also is comprised by it connects to ground, thus realize avoiding Transmit-Receive Unit 20b, the radiofrequency signal that 20c receives is sent to its low noise amplifier 204 comprised and then damages radio-frequency (RF) transceiver 10, improve the isolation between adjacent antenna.When Transmit-Receive Unit 20a is in accepting state, the enable pin of power amplifier 202 is low level, diode D1 ends, the radiofrequency signal that antenna 210 receives is sent to low noise amplifier 204 by the first electric capacity C1, the second electric capacity C2, then is sent to radio-frequency (RF) transceiver 10 after low noise amplifier 204 amplifies.
Fig. 4 is the circuit diagram of multi-input/output antenna transmission circuit 100c in an embodiment of the present invention.In the present embodiment, input multi-output antenna transmission circuit 100b in input multi-output antenna transmission circuit 100c and Fig. 3 is substantially identical, difference is only that the low noise amplifier 204 inputted in multi-output antenna transmission circuit 100c changes, so no longer describe in detail with the electrical connection of second switch unit 208a.
Above-mentioned multi-input/output antenna transmission circuit carries out transceiver path switching by setting up switch element, realize isolation transmission path and RX path, restrained effectively the humorous wave interference that transmission path and RX path produce each other, improve isolation between antennae simultaneously, and then improve transmitting power and the transmission range of antenna.
Claims (6)
1. a multi-input/output antenna transmission circuit, comprise radio-frequency (RF) transceiver and multiple Transmit-Receive Unit, it is characterized in that, each Transmit-Receive Unit includes:
Antenna;
Power amplifier, is electrically connected on described radio-frequency (RF) transceiver, and the signal to be transmitted for exporting described radio-frequency (RF) transceiver carries out power amplification to be gone out by described antenna transmission;
Low noise amplifier, is electrically connected on described radio-frequency (RF) transceiver, and the radiofrequency signal for receiving described antenna amplifies to be sent to described radio-frequency (RF) transceiver;
First switch element, comprise common port, first end and the second end, described common port is electrically connected on described antenna, described first end is electrically connected on described power amplifier, for selecting to connect described antenna and described power amplifier according to the reiving/transmitting state of described radio-frequency (RF) transceiver, or connect described antenna and described low noise amplifier; And
Second switch unit, comprise common port, first end and the second end, described common port is electrically connected on the second end of described first switch element, described first end is electrically connected on described low noise amplifier, described second end ground connection, for selecting according to the reiving/transmitting state of described radio-frequency (RF) transceiver the second end connecting described low noise amplifier and described first switch element, or connect the second end and the earth terminal of described first switch element.
2. multi-input/output antenna transmission circuit as claimed in claim 1, it is characterized in that, described power amplifier also comprises enable pin, for controlling the running status of described power amplifier according to the reiving/transmitting state of radio-frequency (RF) transceiver, when described radio-frequency (RF) transceiver is in emission state, described power amplifier is in running order, second end of described first switch element and described earth terminal conducting, when described radio-frequency (RF) transceiver is in accepting state, described power amplifier is in resting state, second end of described first switch element and described low noise amplifier conducting.
3. multi-input/output antenna transmission circuit as claimed in claim 1, it is characterized in that, described second switch unit comprises:
First electric capacity, one end be electrically connected on described first switch element the second end;
Second electric capacity, one end is electrically connected on the other end of described first electric capacity, and the other end is electrically connected on described low noise amplifier;
Diode, positive pole is electrically connected on the common port of described first electric capacity and described second electric capacity, minus earth;
Inductance, one end is electrically connected on the common port of described first electric capacity and described second electric capacity;
Resistance, one end is electrically connected on the other end of described inductance, and the other end is electrically connected on described radio-frequency (RF) transceiver; And
3rd electric capacity, one end is electrically connected on the common port of described inductance and described resistance, other end ground connection.
4. a multi-input/output antenna transmission circuit, comprise radio-frequency (RF) transceiver and multiple Transmit-Receive Unit, it is characterized in that, each Transmit-Receive Unit includes:
Antenna;
Power amplifier, is electrically connected on described radio-frequency (RF) transceiver, and the signal to be transmitted for exporting described radio-frequency (RF) transceiver carries out power amplification to be gone out by described antenna transmission;
Low noise amplifier, is electrically connected on described radio-frequency (RF) transceiver, and the radiofrequency signal for receiving described antenna amplifies to be sent to described radio-frequency (RF) transceiver;
First switch element, comprise common port, first end and the second end, described common port is electrically connected on described antenna, described first end is electrically connected on described power amplifier, described second end is electrically connected on described low noise amplifier, for selecting to connect described antenna and described power amplifier according to the reiving/transmitting state of described radio-frequency (RF) transceiver, or connect described antenna and described low noise amplifier; And
Second switch unit, comprise common port, first end and the second end, described common port is electrically connected on described low noise amplifier, described first end is electrically connected on described radio-frequency (RF) transceiver, described second end ground connection, for selecting to connect described low noise amplifier and described radio-frequency (RF) transceiver according to the reiving/transmitting state of described radio-frequency (RF) transceiver, or connect described low noise amplifier and earth terminal.
5. multi-input/output antenna transmission circuit as claimed in claim 4, it is characterized in that, described power amplifier also comprises enable pin, for controlling the running status of described power amplifier according to the reiving/transmitting state of radio-frequency (RF) transceiver, when described radio-frequency (RF) transceiver is in emission state, described power amplifier is in running order, described low noise amplifier and described earth terminal conducting, when described radio-frequency (RF) transceiver is in accepting state, described power amplifier is in resting state, described low noise amplifier and described radio-frequency (RF) transceiver conducting.
6. multi-input/output antenna transmission circuit as claimed in claim 4, it is characterized in that, described second switch unit comprises:
First electric capacity, one end is electrically connected on described low noise amplifier;
Second electric capacity, one end is electrically connected on the other end of described first electric capacity, and the other end is electrically connected on described radio-frequency (RF) transceiver;
Diode, positive pole is electrically connected on the common port of described first electric capacity and described second electric capacity, minus earth;
Inductance, one end is electrically connected on the common port of described first electric capacity and described second electric capacity;
Resistance, one end is electrically connected on the other end of described inductance, and the other end is electrically connected on described radio-frequency (RF) transceiver; And
3rd electric capacity, one end is electrically connected on the common port of described inductance and described resistance, other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410123855.3A CN104954052B (en) | 2014-03-28 | 2014-03-28 | Multi-input/output antenna transmission circuit |
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| CN201410123855.3A CN104954052B (en) | 2014-03-28 | 2014-03-28 | Multi-input/output antenna transmission circuit |
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| CN104954052B CN104954052B (en) | 2018-08-07 |
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