CN211352192U - Frequency conversion receiving and transmitting circuit based on 2.4GWIFi - Google Patents
Frequency conversion receiving and transmitting circuit based on 2.4GWIFi Download PDFInfo
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- CN211352192U CN211352192U CN202020285453.4U CN202020285453U CN211352192U CN 211352192 U CN211352192 U CN 211352192U CN 202020285453 U CN202020285453 U CN 202020285453U CN 211352192 U CN211352192 U CN 211352192U
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Abstract
The utility model relates to the field of communication circuits, in particular to a frequency conversion transceiver circuit based on 2.4GWIFi, which comprises a transmitting circuit, a receiving circuit and a radio frequency transceiver switch connected with the transmitting circuit and the receiving circuit; the transmitting circuit comprises a frequency mixer, a first-stage power amplifier circuit, a second-stage power amplifier circuit and a third-stage power amplifier circuit; the receiving circuit comprises a first-stage amplifying circuit and a second-stage amplifying circuit. The utility model discloses can adjust first frequency, dynamic adjustment transmit power amplification and receive gain, remove to adapt to receiving and dispatching parameter according to the index of WIFI chip, reach the advantage that the matching degree is high, strong adaptability, range of application are wide.
Description
Technical Field
The utility model relates to a communication circuit field especially relates to a frequency conversion transceiver circuit based on 2.4 GWIFi.
Background
With the development of communication technologies, WIFI has become one of the most popular communication technologies, and its application range is wide, speed is fast, and so on, so that almost all communication devices have the necessary function. In the non-consumption industry field, the communication technology requirements are higher, such as non-civil frequency range communication, long distance, high speed and the like, and the requirements lead the non-civil frequency range communication of <2.4G to be adopted in the common 2.4 GWIFISI communication in an up-down frequency conversion mode, so that the confidentiality is improved; meanwhile, the power and the sensitivity of the received and transmitted signals need to be increased, and the characteristic of longer transmission distance than the common 2.4 GWIFISI is achieved.
The local oscillator of the frequency mixer of the traditional frequency conversion circuit is relatively fixed, so that the intermediate frequency output is also fixed, and meanwhile, the transmitting power and the receiving gain are also relatively fixed, so that the final product has the disadvantages of singleness, limited application range and the like.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a frequency conversion transceiver circuit based on 2.4 GWIFi.
In order to solve the technical problem, the technical scheme of the utility model is that:
a frequency conversion transceiving circuit based on 2.4GWIFi comprises a transmitting circuit, a receiving circuit and a radio frequency transceiving switch connected with the transmitting circuit and the receiving circuit,
the transmission circuit includes:
the mixer is used for mixing with the 2.4GWIFi signal and then outputting a radio frequency signal;
the first-stage power amplification circuit is connected with the frequency mixer and is used for amplifying the radio frequency signal;
the second-stage power amplifier circuit comprises a first pi-type attenuation network and a second-stage power amplifier chip PA2, wherein the first pi-type attenuation network is connected with the first-stage power amplifier circuit; the second-stage power amplifier chip PA2 is connected with the first pi-type attenuation network and used for carrying out power amplification on the output signal;
the third-stage power amplification circuit is connected with the second-stage power amplification circuit and is used for carrying out power amplification on an output signal of the second-stage power amplification circuit;
the receiving circuit includes:
the first-stage amplifying circuit is connected with the radio frequency transceiving switch and is used for amplifying the received signal;
and the secondary amplifying circuit is connected with the primary amplifying circuit and is used for amplifying the output signal of the primary amplifying circuit.
Preferably, the first-stage power amplifier circuit includes:
a band-pass filter BPF1 connected with the mixer, and a primary power amplifier chip PA1 connected with the band-pass filter BPF 1.
Preferably, the three-stage power amplifier circuit includes: the power amplifier comprises a three-stage power amplifier chip PA3 connected with a two-stage power amplifier chip PA2 and a low-pass filter LPF1 connected with a three-stage power amplifier chip PA 3.
Preferably, the first-stage amplifying circuit includes:
the low noise amplifier LNA1 is connected with the radio frequency transceiving switch and is used for amplifying the received signal;
the second pi-type attenuation network is connected with the low noise amplifier LNA 1;
the band-pass filter BPF2 is connected with the second pi-type attenuation network and used for filtering;
preferably, the two-stage amplifying circuit includes:
a low noise amplifier LNA2, and a low pass filter LPF2 connected to the low noise amplifier LNA2, wherein the low pass filter LPF2 outputs a signal to the mixer.
Preferably, the signal output end of the mixer is further connected with a 2.4G band-pass filter BPF3 for filtering mixed frequency components except 2.4G
Compare prior art, the utility model has the advantages that:
the utility model discloses can adjust first frequency, dynamic adjustment transmit power amplification and receive gain, remove to adapt to receiving and dispatching parameter according to the index of WIFI chip, reach the advantage that the matching degree is high, strong adaptability, range of application are wide.
Drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a circuit diagram of a mixer;
FIG. 3 is a circuit diagram of a first stage power amplifier circuit;
FIG. 4 is a circuit diagram of a two-stage power amplifier circuit;
FIG. 5 is a circuit diagram of a three-stage power amplifier circuit;
FIG. 6 is a circuit diagram of the RF transmit/receive switch;
FIG. 7 is a circuit diagram of a one-stage amplification circuit;
FIG. 8 is a circuit diagram of a two-stage amplification circuit;
fig. 9 is a diagram of the band pass filter BPF3 and its peripheral circuits.
Reference numerals: 100. a first-stage power amplifier circuit; 200. a secondary power amplifier circuit; 201. a first pi-type attenuation network; 300. a third-stage power amplifier circuit; 400. a first-stage amplifying circuit; 401. a second pi-type attenuator network; 500. and a secondary amplifying circuit.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.
Example (b):
referring to fig. 1, the present embodiment provides a frequency conversion transceiver circuit based on 2.4GWiFi, which includes a transmitting circuit, a radio frequency transceiver Switch, and a receiving circuit.
Wherein the transmission circuit begins from the WIFI transmitting terminal, and it includes: the Mixer, the first-stage power amplifier circuit 100, the second-stage power amplifier circuit 200 and the third-stage power amplifier circuit 300;
the Mixer mainly comprises a chip RFFC2071A and a peripheral circuit, and is configured with corresponding local oscillation parameters according to the required output frequency F0 so as to achieve the functions of transceiving and up-down frequency conversion; the specific circuit connection relationship is shown in fig. 2; therefore, the 2.4G WIFI signal is output to the Mixer through the WIFI chip, the local oscillator signal is generated by the Mixer, the local oscillator signal is mixed with the 2.4G signal and then the radio frequency signal of F0 is output, and the down-conversion work of the signal is completed.
Since the 2.4 GWIFII signal is very small, the analog WIFI signal value is 0dbm, and 10db of attenuation is brought by the Mixer after down-conversion, the power value of the F0 signal is-10 dbm after mixing output, the power is very small, and the signal can be transmitted after further amplification.
Therefore, the transmitting circuit in this embodiment further includes a first-stage power amplifier circuit 100, which is connected to the Mixer and mainly includes: a band-pass filter BPF1 connected with the Mixer, a primary power amplifier chip PA1 connected with the band-pass filter BPF1, and a peripheral circuit, wherein the specific circuit connection relationship is shown in fig. 3; the band-pass filter BPF1 is used for filtering mixing components except for F0, and a chip U5 with the model number of SF5128 is adopted; the primary power amplifier chip PA1 adopts a chip U1011 with the model number of TQP3M 9036; thus, a first-stage power amplifier is completed by a first-stage power amplifier chip PA1, the gain is 20db, and the mixed frequency component is filtered by a band-pass filter BPF1 in front of a first-stage power amplifier chip PA1, which is specifically shown in FIG. 3.
In this embodiment, the secondary power amplifier circuit 200 includes a first pi-type attenuation network 201, a secondary power amplifier chip PA2, and a peripheral circuit, where the first pi-type attenuation network 201 is connected to the primary power amplifier circuit 100, and a specific connection relationship is shown in fig. 4.
As shown in fig. 4, the first pi-type attenuation network 201 includes a resistor R1, a resistor R2, and a resistor R3, wherein a first end of the resistor R1 is connected to a first end of the resistor R2 and then connected to an output end of the first-stage power amplifier circuit 100; the second end of the resistor R2 is connected with the first end of the resistor R3 and then is connected to the input end of the secondary power amplifier chip PA 2; the second end of the resistor R1 and the second end of the resistor R3 are both grounded.
In this embodiment, the second-stage power amplifier chip PA2 adopts a chip U1117 with model TQP7M9102, as shown in fig. 4; through the arrangement, a two-stage power amplifier is completed by the PA2, the gain is 20db, and the first pi-type network 201 before the PA2 completes the signal attenuation work, so that the input power of the PA2 is in a linear range, as shown in FIG. 4.
In this embodiment, the third-stage power amplifier circuit 300 is connected to the second-stage power amplifier circuit 200, and specifically includes a third-stage power amplifier chip PA3 connected to the second-stage power amplifier chip PA2, a low pass filter LPF1 connected to the third-stage power amplifier chip PA3, and a peripheral circuit. The specific circuit connection relationship is shown in fig. 5.
The three-stage power amplifier chip PA3 adopts a chip U1009 with the model number of RFPA 3800; the low pass filter LPF1 adopts a chip U4 with model number LFL21902MTC1a018, as shown in fig. 5 specifically, so that a PA3 completes three-stage power amplification, and the low pass filter LPF1 after the PA3 has gain of 15db to filter out high frequency components.
The gain of the three-level power amplifier is 45db in total, the first pi-type attenuation network 201 can realize 0-45db dynamic adjustable output, and the index requirements of products can be better met.
In this embodiment, the rf Switch mainly includes a chip U1010 with a model of RFSW8000, and a peripheral circuit, and the specific circuit connection relationship is as shown in fig. 6, in which an input end of the rf Switch is connected to an output end of the transmitting circuit, and an output end of the rf Switch is connected to an input end of the receiving circuit, so that signal switching is completed through the rf Switch, and then the transmitted signal is transmitted to the antenna and finally received by the receiving circuit.
The receiving circuit in this embodiment includes a first-stage amplifying circuit 400 and a second-stage amplifying circuit 500, specifically:
the first-stage amplifying circuit 400 is connected to the rf transceiving switch, and includes a low noise amplifier LNA1 connected to the rf transceiving switch, a second pi-type attenuation network 401 connected to the low noise amplifier LNA1, a band-pass filter BPF2 connected to the second pi-type attenuation network 401, and peripheral circuits, and the specific circuit connection relationship is shown in fig. 7.
As shown in fig. 7, the LNA1 uses a chip U1017 with model TQP3M9036 to amplify the received signal;
the second pi-type attenuator network 401 shown in FIG. 7 includes resistors R7, R8, and R11; a first end of the resistor R7 is connected with a first end of the resistor R8 and then connected with an output end of the low noise amplifier LNA 1; the first end of the resistor R11 is connected with the second end of the resistor R8 and then is connected with the input end of the band-pass filter BPF 2; the second end of the resistor R7 and the resistor R11 are grounded.
As shown in fig. 7, the bandpass filter BPF2 employs a chip U1018 model SF 5128.
The two-stage amplifying circuit 500 in the present embodiment includes a low noise amplifier LNA2, a low pass filter LPF2 connected to the low noise amplifier LNA2, and peripheral circuits; the specific circuit connection relationship of the low pass filter LPF2 to output a signal to the Mixer is shown in fig. 8.
As shown in fig. 8, the low noise amplifier LNA2 uses a chip U1 of model TQP3M 9036; the low pass filter LPF2 uses a chip U2 model LFL21902MTC1a 018.
In the receiving circuit, after the receiving circuit is switched from a radio frequency transceiver, the receiving circuit is amplified by two stages of LNA1 and LNA2, out-of-band interference caused by an antenna is filtered by a low pass filter LPF2, the out-of-band interference is filtered by a band pass filter BPF2, and the two stages of LNA bring about 40db of gain in total.
The receiving circuit part adopts LNA1 and LNA2 two-stage amplification, so that the gain of 40db can be obtained totally, the dynamic adjustable gain of 0-40db can be realized through the second pi-type attenuation network 401, and the receiving circuit part can be used by matching with different WIFI chips to meet the requirement of high sensitivity.
Signals enter the Mixer after being amplified by the LNA1 and the LNA2, and the up-conversion function of the signals is realized through the local oscillator configured by the Mixer, so that the signals work at 2.4G. However, since the up-converted signal will bring other mixing components and require further filtering, in this embodiment, the signal output terminal of the Mixer is further connected to a 2.4G band-pass filter BPF3 and peripheral circuits, as shown in fig. 9; to filter out mixing components other than 2.4G.
The band-pass filter BPF3 is a chip U1008 with model 885062.
The frequency conversion transceiving circuit scheme designed by the embodiment can realize up-down frequency conversion output of any frequency band, realize selection of different frequency bands in various industries, and can be used as an ad hoc network front-end scheme. Secondly, the transmitting power and the receiving gain can be optimized, and various receiving and transmitting indexes such as non-attenuation transmitting of power, high-sensitivity receiving of signals and the like are achieved according to the index requirements of the WIFI chip and the specification requirements of products. The circuit design is simple, the occupied area is small, and the transportability, the realizability and the reliability are high.
Above only the typical example of the utility model discloses, in addition, the utility model discloses can also have other multiple concrete implementation manners, all adopt the technical scheme that equivalent replacement or equivalent transform formed, all fall in the utility model discloses the scope of claiming.
Claims (6)
1. Frequency conversion transceiver circuit based on 2.4GWIFi, its characterized in that: the radio frequency transceiver comprises a transmitting circuit, a receiving circuit and a radio frequency transceiving switch connected with the transmitting circuit and the receiving circuit;
the transmission circuit includes:
the mixer is used for mixing with the 2.4GWIFi signal and then outputting a radio frequency signal;
the first-stage power amplification circuit is connected with the frequency mixer and is used for amplifying the radio frequency signal;
the second-stage power amplifier circuit comprises a first pi-type attenuation network and a second-stage power amplifier chip PA2, wherein the first pi-type attenuation network is connected with the first-stage power amplifier circuit; the second-stage power amplifier chip PA2 is connected with the first pi-type attenuation network and used for carrying out power amplification on the output signal;
the third-stage power amplification circuit is connected with the second-stage power amplification circuit and is used for carrying out power amplification on an output signal of the second-stage power amplification circuit;
the receiving circuit includes:
the first-stage amplifying circuit is connected with the radio frequency transceiving switch and is used for amplifying the received signal;
and the secondary amplifying circuit is connected with the primary amplifying circuit and is used for amplifying the output signal of the primary amplifying circuit.
2. The 2.4 GWIFi-based frequency conversion transceiver circuit of claim 1, wherein: the first-stage power amplifier circuit comprises:
a band-pass filter BPF1 connected with the mixer, and a primary power amplifier chip PA1 connected with the band-pass filter BPF 1.
3. The 2.4 GWIFi-based frequency conversion transceiver circuit of claim 2, wherein: the three-stage power amplifier circuit comprises: the power amplifier comprises a three-stage power amplifier chip PA3 connected with a two-stage power amplifier chip PA2 and a low-pass filter LPF1 connected with a three-stage power amplifier chip PA 3.
4. A 2.4 GWiFi-based variable frequency transceiver circuit according to any of claims 1-3, wherein: the first-stage amplifying circuit includes:
the low noise amplifier LNA1 is connected with the radio frequency transceiving switch and is used for amplifying the received signal;
the second pi-type attenuation network is connected with the low noise amplifier LNA 1;
and the band-pass filter BPF2 is connected with the second pi-type attenuation network and used for filtering.
5. The 2.4 GWIFi-based frequency conversion transceiver circuit of claim 4, wherein: the two-stage amplifying circuit includes:
a low noise amplifier LNA2, and a low pass filter LPF2 connected to the low noise amplifier LNA2, wherein the low pass filter LPF2 outputs a signal to the mixer.
6. The 2.4 GWIFi-based frequency conversion transceiver circuit of claim 5, wherein: the signal output end of the mixer is also connected with a 2.4G band-pass filter BPF3 for filtering the mixed frequency components except 2.4G.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020285453.4U CN211352192U (en) | 2020-03-10 | 2020-03-10 | Frequency conversion receiving and transmitting circuit based on 2.4GWIFi |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020285453.4U CN211352192U (en) | 2020-03-10 | 2020-03-10 | Frequency conversion receiving and transmitting circuit based on 2.4GWIFi |
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| CN211352192U true CN211352192U (en) | 2020-08-25 |
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| CN202020285453.4U Active CN211352192U (en) | 2020-03-10 | 2020-03-10 | Frequency conversion receiving and transmitting circuit based on 2.4GWIFi |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152661A (en) * | 2020-09-07 | 2020-12-29 | Oppo广东移动通信有限公司 | Antenna assembly, radio frequency system and customer premises equipment |
| CN112713869A (en) * | 2021-03-24 | 2021-04-27 | 杭州字节信息技术有限公司 | Front-end transmitting power adjustable circuit based on SX1302 and SX1250 and working method thereof |
-
2020
- 2020-03-10 CN CN202020285453.4U patent/CN211352192U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152661A (en) * | 2020-09-07 | 2020-12-29 | Oppo广东移动通信有限公司 | Antenna assembly, radio frequency system and customer premises equipment |
| CN112713869A (en) * | 2021-03-24 | 2021-04-27 | 杭州字节信息技术有限公司 | Front-end transmitting power adjustable circuit based on SX1302 and SX1250 and working method thereof |
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