CN216490461U - Anti-interference wireless signal receiver circuit - Google Patents
Anti-interference wireless signal receiver circuit Download PDFInfo
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- CN216490461U CN216490461U CN202123272942.XU CN202123272942U CN216490461U CN 216490461 U CN216490461 U CN 216490461U CN 202123272942 U CN202123272942 U CN 202123272942U CN 216490461 U CN216490461 U CN 216490461U
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Abstract
The utility model discloses an anti-interference wireless signal receiver circuit, which comprises a signal pre-regulator and at least one stage of amplifier which are connected in series; the signal pre-regulator comprises a large signal path and a small signal path which are connected in parallel; the small signal path is provided with a preamplifier; the small signal path is used for amplifying the signal received by the radio frequency antenna into a signal with a preset intensity range; the large signal path is used for modulating the signal received by the radio frequency antenna into a signal with a preset intensity range. The utility model discloses a parallelly connected preset ware of big signal path and little signal path can effectually avoid low noise amplifier to receive interference signal's influence or even destroy, adapts to different signal power.
Description
Technical Field
The utility model belongs to the wireless communication field, more specifically relates to an anti-interference wireless signal receiver circuit.
Background
In a general receiver architecture, a signal is received by an antenna, and then passes through a Low Noise Amplifier (LNA) and a second stage signal amplifier. When strong signal interference is encountered, the performance of a receiver is interfered, the error rate is reduced, and the quality of a received signal is reduced. In severe cases, signal blocking may occur, resulting in receiver inoperability. In extreme cases, this can lead to receiver amplifier burn-out.
At present, active devices such as a limiter, an attenuator and a switch are generally adopted, so that the problems can be partially solved, but more noises, insertion loss and stray are introduced, and the performance of the low-noise amplifier in normal operation is influenced.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides an anti-jamming wireless signal receiver circuit, its aim at realizes signal power through parallelly connected big signal path and small signal path and selects, solves the low noise amplifier's that interfering signal leads to influence from this, finally leads to signal quality decline, signal blocking's technical problem.
To achieve the above object, according to one aspect of the present invention, there is provided a wireless signal receiver circuit including a signal pre-regulator and at least one stage of amplifier connected in series;
the signal pre-regulator comprises a large signal path and a small signal path which are connected in parallel; the small signal path is provided with a preamplifier; the small signal path is used for amplifying the signal received by the radio frequency antenna into a signal with a preset intensity range; the large signal path is used for modulating the signal received by the radio frequency antenna into a signal with a preset intensity range.
Preferably, the wireless signal receiver circuit has a signal strength range covered by the large signal path and a signal strength range covered by the small signal path, which are connected.
Preferably, the large signal path and the small signal path of the wireless signal receiver circuit are coupled in parallel by a passive coupler.
Preferably, the large signal path and the small signal path of the wireless signal receiver circuit are connected in parallel end to end by passive coupler coupling.
Preferably, the preamplifier provided in the small signal path of the wireless signal receiver circuit is a low noise amplifier.
Preferably, the small signal path of the wireless signal receiver circuit comprises a controller, and the controller is connected to the control end of the preamplifier according to a control signal generated by signal strength.
Preferably, the controller of the wireless signal receiver circuit is a T-type biaser, which generates a dc control signal to access the control terminal of the preamplifier.
Preferably, the large signal path of the wireless signal receiver circuit is provided with a pre-attenuator.
Preferably, the wireless signal receiver circuit comprises a radio frequency antenna, and the radio frequency antenna is connected with the pre-regulator.
Preferably, the wireless signal receiver circuit comprises an analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the amplifier.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
the utility model discloses a parallelly connected preset ware of big signal path and little signal path can effectually avoid low noise amplifier to receive interference signal's influence or even destroy, adapts to different signal power.
In the preferred scheme, a passive circuit is adopted, so that the protection of the low-noise amplifier circuit can be realized by using the minimum insertion loss, and the demodulation of large signals and small signals can be considered. The method is generally used in the fields of anti-interference receivers, electronic countermeasures, military radars, military radio stations, satellite communication, communication base stations, mobile phones and the like.
Drawings
Fig. 1 is a schematic diagram of a circuit structure of a wireless signal receiver provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a circuit structure of a wireless signal receiver provided in embodiment 2 of the present invention;
fig. 3 is a schematic diagram of a circuit structure of a wireless signal receiver provided in embodiment 3 of the present invention. The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the antenna comprises a radio frequency antenna 1, a passive coupler 2, a T-shaped biaser 3, an AND preamplifier 4, an amplifier 5, an analog-to-digital conversion module 6 and an attenuator 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
The utility model provides a wireless signal receiver circuit, which is characterized in that the wireless signal receiver circuit comprises a signal pre-regulator and at least one stage of amplifier which are connected in series;
the signal pre-regulator comprises a large signal path and a small signal path which are connected in parallel; generally, the signal strength range covered by a via is contiguous with the signal strength range covered by the small signal via. Through a certain selection mechanism, when the signal is small, the signal enters a second-stage amplifier through the first-stage amplification of a small signal path, and then the signal is demodulated; when the signal strength reaches a certain degree, a large signal path is selected to directly enter the second-stage amplifier or enter the second-stage amplifier after attenuation, so that the demodulation of large signals and small signals is realized, and the possibility of damaging the preamplifier due to interference signals is reduced.
In the preferred scheme, the large signal path and the small signal path are coupled in parallel by adopting a passive coupler; more preferably, the beat signal path and the small signal path are connected in parallel end to end by passive coupler coupling. By adopting the passive coupler, the preamplifier can be protected by using the minimum insertion loss, and more noises, insertion loss and stray are avoided.
The small signal path is provided with a preamplifier; the preamplifier is preferably a Low Noise Amplifier (LNA); the small signal path comprises a T-shaped biaser, and a direct current control signal generated by the T-shaped biaser is accessed to the control end of the pre-attenuator. The small signal path is used for amplifying the signal received by the radio frequency antenna into a signal with a preset intensity range. When the signal is too strong, the direct current control signal generated by the T-shaped biaser can directly close the preamplifier, so that the preamplifier is automatically protected from being burnt.
The large signal path is provided with a pre-attenuator and is used for attenuating the signal received by the radio frequency antenna into a signal with a preset intensity range;
the utility model provides a signal receiver circuit, control device can adopt passive device to realize completely, and loss, noise of introducing are because active devices such as switch, and the response is faster simultaneously, and the reliability is higher.
The following are examples:
example 1
As shown in fig. 1, the signal receiver circuit provided in this embodiment includes a radio frequency antenna, a pre-modulator, an amplifier, and an analog-to-digital conversion module (ADC) connected in series; after the wireless signal is received by the radio frequency antenna, the wireless signal is accessed to a signal receiver circuit.
The pre-regulator comprises a small signal path and a large signal path which are connected in parallel by a passive coupler from head to tail; the T-type biaser generates a direct current control signal to be connected to a control end of the low noise amplifier, and when the signal is overlarge, a small signal path is directly cut off, and the Low Noise Amplifier (LNA) is closed. The large signal path is provided with an attenuator which modulates the signal received by the radio frequency antenna into a signal with a preset intensity range. The small signal path and the large signal path are connected in parallel to enter the second-stage amplifier or enter the second-stage amplifier after being attenuated in the large signal path. Preferably by adding a switching circuit
And after the second-stage amplifier amplifies the signal, the signal is accessed to an analog-to-digital conversion module for signal demodulation.
Example 2
As shown in fig. 2, the signal receiver circuit provided in this embodiment includes a radio frequency antenna, a pre-modulator, an amplifier, and an analog-to-digital conversion module (ADC) connected in series; after being received by the radio frequency antenna, the wireless signals are accessed to a signal receiver circuit.
The pre-regulator comprises a small signal path and a large signal path which are connected in parallel by a passive coupler from head to tail; the wireless signals are subjected to power distribution through a passive coupler, the passive coupler adopts DC0900P10 in the embodiment, and the output power of a coupling port of the passive coupler is 10dB less than that of an Input end; the upstream passive coupler is coupled with a port to access a small signal path, the small signal path is connected with a T-shaped biaser (Bias-T) and a Low Noise Amplifier (LNA) (the reference model of the low noise amplifier is BGU8051, the brand name is NXP https:// www.nxp.com/products/radio-frequency/rf-amplifiers-low-medium-power/low-noise-amplifiers-LNAs/LNAs-for-wireless-infrastructure/low-noise-high-li-noise-amplifier: BGU8051) in series, the T-shaped biaser generates a direct current control signal to access a control terminal of the low noise amplifier, and when the signal is overlarge, the small signal path is directly cut off, and the Low Noise Amplifier (LNA) is turned off. The coupling port is connected to a large signal path, and the large signal path is provided with an attenuator for modulating the signal received by the radio frequency antenna into a signal within a preset intensity range. The small signal path and the large signal path are connected in parallel to enter the second-stage amplifier or enter the second-stage amplifier after being attenuated in the large signal path.
And after the second-stage amplifier amplifies the signal, the signal is accessed to an analog-to-digital conversion module for signal demodulation.
Example 3
As shown in fig. 3, the signal receiver circuit provided in this embodiment includes a radio frequency antenna, a pre-modulator, an amplifier, and an analog-to-digital conversion module (ADC) connected in series; after the wireless signal is received by the radio frequency antenna, the wireless signal is accessed to a signal receiver circuit.
The pre-regulator comprises a small signal path and a large signal path which are connected in parallel by a passive coupler from head to tail; the wireless signals are subjected to power distribution through a passive coupler, the passive coupler adopts DC0900P10 in the embodiment, and the output power of a coupling port of the passive coupler is 10dB less than that of an Input end; the upstream passive coupler is coupled with a port to access a small signal path, the small signal path is connected with a T-shaped biaser (Bias-T) and a Low Noise Amplifier (LNA) (the reference model of the low noise amplifier is BGU8051, the brand name is NXP https:// www.nxp.com/products/radio-frequency/rf-amplifiers-low-medium-power/low-noise-amplifiers-LNAs/LNAs-for-wireless-infrastructure/low-noise-high-li-noise-amplifier: BGU8051) in series, the T-shaped biaser generates a direct current control signal to access a control terminal of the low noise amplifier, and when the signal is overlarge, the small signal path is directly cut off, and the Low Noise Amplifier (LNA) is turned off. The coupling port is connected to a large signal path, the large signal path is provided with an attenuator, and the signal received by the radio frequency antenna is modulated into a signal within a preset intensity range. The small signal path and the large signal path are connected in parallel through a downstream passive coupler and then are connected into a second-stage amplifier, the small signal path is connected into a coupling port or an input port of the downstream passive coupler, and the large signal path is connected into an output port or a coupling port at the downstream; when the signal strength reaches a certain degree, the signal directly enters a second-stage amplifier or enters the second-stage amplifier after being attenuated in a large signal path.
Assuming a degree of coupling of 10dB and a 3dB intermediate attenuator, the signal at the input of the second stage amplifier circuit is now 23dB less than the signal before the first stage LNA
And after the second-stage amplifier amplifies the signal, the signal is accessed to an analog-to-digital conversion module for signal demodulation.
The scheme adopts the passive coupler, and minimum insertion loss and noise are introduced when the LNA normally works in a small signal scene. The passive coupler can bypass the large signal around the first-stage LNA, is directly connected to the second-stage amplifier, and plays a role in demodulating the large signal when the first-stage LNA is switched off. Meanwhile, radio frequency large signals in the circuit are converted into direct current control signals through the Bias-T, the first-stage LNA is directly turned off, and the LNA is prevented from being burnt.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A wireless signal receiver circuit is characterized by comprising a signal pre-regulator and at least one stage of amplifier which are connected in series;
the signal pre-regulator comprises a large signal path and a small signal path which are connected in parallel; the small signal path is provided with a preamplifier; the small signal path is used for amplifying the signal received by the radio frequency antenna into a signal with a preset intensity range; the large signal path is used for modulating the signal received by the radio frequency antenna into a signal with a preset intensity range.
2. The wireless signal receiver circuit of claim 1, wherein the large signal path covers a range of signal strengths that is contiguous with a range of signal strengths covered by the small signal path.
3. The wireless signal receiver circuit of claim 1 or 2, wherein the large signal path and the small signal path are coupled in parallel using a passive coupler.
4. The wireless signal receiver circuit of claim 3, wherein the large signal path and the small signal path are coupled in parallel end-to-end using a passive coupler.
5. The wireless signal receiver circuit of claim 1 or 2, wherein the preamplifier disposed in the small signal path is a low noise amplifier.
6. The wireless signal receiver circuit of claim 1 or 2, wherein the small signal path includes a controller that accesses the control terminal of the preamplifier in accordance with a control signal generated by a signal strength.
7. The wireless signal receiver circuit of claim 6, wherein the controller is a T-biaser that generates a DC control signal coupled to the control terminal of the preamplifier.
8. A wireless signal receiver circuit according to claim 1 or 2, wherein the large signal path is provided with a pre-attenuator.
9. A wireless signal receiver circuit according to claim 1 or 2, comprising a radio frequency antenna, the radio frequency antenna being connected to the pre-regulator.
10. The wireless signal receiver circuit of claim 9, comprising an analog-to-digital conversion module, the analog-to-digital conversion module coupled to the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123272942.XU CN216490461U (en) | 2021-12-24 | 2021-12-24 | Anti-interference wireless signal receiver circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123272942.XU CN216490461U (en) | 2021-12-24 | 2021-12-24 | Anti-interference wireless signal receiver circuit |
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| CN216490461U true CN216490461U (en) | 2022-05-10 |
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| CN202123272942.XU Active CN216490461U (en) | 2021-12-24 | 2021-12-24 | Anti-interference wireless signal receiver circuit |
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