CN210518283U

CN210518283U - Miniaturized high-sensitivity large-dynamic broadband receiving device

Info

Publication number: CN210518283U
Application number: CN201921702487.2U
Authority: CN
Inventors: 甘明; 李永强; 尹文丰; 屈明伟
Original assignee: Guangzhou Haige Communication Group Inc Co
Current assignee: Guangzhou Haige Communication Group Inc Co
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-05-12
Anticipated expiration: 2029-10-11

Abstract

The utility model discloses a big dynamic broadband receiving arrangement of miniaturized high sensitivity, broadband receiving arrangement adopts integrated circuit, integrated circuit includes: the device comprises an antenna, a protection circuit, a band-pass filter, a low-noise amplifier, a step attenuator and an analog-to-digital converter; the antenna, the protection circuit and the band-pass filter are sequentially connected, the output end of the band-pass filter is connected with the movable end of the first single-pole double-throw switch, and the first fixed end of the first single-pole double-throw switch is connected with the input end of the low-noise amplifier. The utility model discloses a big dynamic broadband receiving arrangement of miniaturized high sensitivity adopts integrated circuit, has replaced traditional discrete component, consequently, the broadband receiving arrangement of this scheme has improved producibility, reliability, has promoted radio frequency indexes such as dynamic range.

Description

Miniaturized high-sensitivity large-dynamic broadband receiving device

Technical Field

The utility model relates to a signal reception technical field, concretely relates to big dynamic broadband receiving arrangement of miniaturized high sensitivity.

Background

With the increasing world military competition, the shortwave communication part depends on the fixed infrastructure which is easy to destroy, and has the characteristics of quickly recovering communication and the like, so that the shortwave communication part is still applied to the large scale in the military and civil fields. However, the application frequency range of short-wave communication is extremely narrow, only 1.6 MHz-30 MHz is provided, even if all channels are 3kHz, only 9467 channels can be accommodated, some special civil radio stations are removed, the remaining available frequency points are very few, and the electromagnetic compatibility environment of short waves is relatively complex, so the dynamic range and the sensitivity are two very important indexes.

Since the appearance of short-wave communication in 2010, the short-wave communication has adopted a traditional narrowband communication mode, the narrowband communication uses a superheterodyne architecture, a narrowband receiver generally has a bandpass filter with a narrow frequency range on a channel, and can filter out unwanted signals other than useful signals, and a schematic block diagram is shown in fig. 1. Therefore, the anti-interference capability is strong, the requirement on the in-band dynamic range is low, and the requirement can be met by 50-60 dB generally.

In recent years, short-wave communication also adopts a broadband receiver method. However, the implementation of the wideband receiver is different from that of the narrowband receiver, and although some of the wideband receivers also use a superheterodyne architecture, there is no narrowband filter on the channel, so that the in-band interference signal cannot be filtered. The research and development of broadband receivers are long, but the current radio frequency front end is still in the research stage and does not reach the reliable production state of products. For example, the method has the disadvantages of low producibility, high power consumption, complex debugging and the like. Particularly, a front-end amplifier of the broadband receiver adopts a discrete device mode, a functional block diagram of the front-end amplifier is shown in fig. 2, the mode has the characteristics of low noise coefficient, good nonlinearity and the like, but the mode has high requirements on printed board wiring, high debugging difficulty, power consumption close to 2.2W, volume close to 10mm x 10mm, an input and output transformer adopts an enameled wire winding mode, the consistency cannot be guaranteed, and the requirements on wiring are extremely high. Meanwhile, the front-end attenuator of the existing broadband receiver adopts a fixed large attenuation mode, an analog AGC (automatic gain control circuit) part consists of fixed attenuators, the smaller the step is, the more switches are needed, and the schematic block diagram of the mode is shown in fig. 3, which is not favorable for realizing AGC.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of above prior art existence, provide a big dynamic broadband receiving arrangement of miniaturized high sensitivity that the debugging degree of difficulty is low, the low power dissipation is high and the reliability is high.

The purpose of the utility model is realized through the following technical scheme:

a miniaturized high-sensitivity large-dynamic broadband receiving device, which adopts an integrated circuit, the integrated circuit comprising: the device comprises an antenna, a protection circuit, a band-pass filter, a low-noise amplifier, a step attenuator and an analog-to-digital converter; the antenna, the protection circuit and the band-pass filter are sequentially connected, the output end of the band-pass filter is connected with the movable end of the first single-pole double-throw switch, the first immovable end of the first single-pole double-throw switch is connected with the input end of the low-noise amplifier, the second immovable end of the first single-pole double-throw switch is connected with the second immovable end of the second single-pole double-throw switch, the output end of the low-noise amplifier is connected with the first immovable end of the second single-pole double-throw switch, the movable end of the second single-pole double-throw switch is connected with the input end of the step attenuator, and the output end of the step attenuator is connected with the analog-to-digital converter.

Preferably, the protection circuit comprises a gas discharge tube, a current limiter, a clamping diode and a limiter which are connected in sequence; the gas discharge tube is used for inhibiting the surge voltage of hundreds of volts to tens of thousands of volts; the current limiter is used for carrying out secondary protection on the transient large signal; the clamping diode is used for limiting a signal to be below 3V; the limiter is used for limiting the output signal to be about +11 dBm.

Preferably, the clamp diode comprises 4 BAS216 tubes.

Compared with the prior art, the utility model have following advantage:

the miniaturized high-sensitivity large-dynamic broadband receiving device adopts an integrated circuit to replace the traditional discrete component, so that the broadband receiving device improves the producibility and the reliability and improves the radio frequency indexes such as the dynamic range. Meanwhile, the power consumption is reduced, the area of a printed board is reduced, and the debugging difficulty is reduced.

The integrated circuit includes: the device comprises an antenna, a protection circuit, a band-pass filter, a low-noise amplifier, a step attenuator and an analog-to-digital converter; namely, the automatic gain control circuit is composed of a step attenuator, which is particularly convenient for the realization of the broadband receiving device of the scheme. The broadband receiving device of the scheme has high sensitivity through calculation.

Drawings

Fig. 1 shows a schematic block diagram of a superheterodyne receiver used for conventional narrowband communication.

Fig. 2 shows a circuit diagram of a low noise amplifier of a prior art wideband receiving rf front end.

Fig. 3 shows a schematic block diagram of a conventional step attenuator for a wideband receiving rf front end.

Fig. 4 shows a schematic structural diagram of a miniaturized high-sensitivity large dynamic broadband receiving device according to the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Referring to fig. 4, a miniaturized, highly sensitive and highly dynamic broadband receiving device employs an integrated circuit, which includes: an antenna 11, a protection circuit 12(ATT), a band pass filter 13(BPF), a low noise amplifier 15(LNA), a step attenuator 17, and an analog-to-digital converter 18 (ADC); the antenna 11, the protection circuit 12 and the band-pass filter 13 are connected in sequence, the output end of the band-pass filter 13 is connected with the movable end of the first single-pole double-throw switch 14, the first immovable end of the first single-pole double-throw switch 14 is connected with the input end of the low-noise amplifier 15, the second immovable end of the first single-pole double-throw switch 14 is connected with the second immovable end of the second single-pole double-throw switch 16, the output end of the low-noise amplifier 15 is connected with the first immovable end of the second single-pole double-throw switch 16, the movable end of the second single-pole double-throw switch 16 is connected with the input end of the step attenuator 17, and the output end of the step attenuator 17 is connected with the analog-to-digital converter 18.

In this embodiment, the protection circuit 12 includes a gas discharge tube, a current limiter, a clamping diode and a limiter connected in sequence; the gas discharge tube is used for inhibiting the surge voltage of hundreds of volts to tens of thousands of volts; the current limiter is used for carrying out secondary protection on the transient large signal; the clamping diode is used for limiting a signal to be below 3V; still further, the clamp diode includes 4 BAS216 tubes. The limiter is used for limiting the output signal to be about +11 dBm. Specifically, the gas discharge tube can suppress surge voltage of hundreds of volts to tens of thousands of volts, can absorb surge current of up to ten thousand amperes, and is used for lightning protection. After the primary lightning protection, the signal passes through the TBU series of over-current and over-voltage secondary protection (current limiter), so that an instantaneous large signal is prevented from entering a channel and is protected by the TBU in series connection. And a third stage adopts a bidirectional high-speed clamping diode to limit the signal to be below 3V. The bidirectional high-speed clamping diode selects 4 BAS216 tubes to form bidirectional protection, and the single BAS216 has reaction time of 4ns, so that the back-end voltage can be quickly protected. The fourth-stage protection adopts a broadband amplitude limiter, when an input signal is larger than +12dBm, the signal is protected, the output is limited to be about +11dBm, and the continuous wave large signal circuit is not damaged.

After passing through the protection circuit 12, the signal is sent to the band pass filter 13, so that overload distortion of the band pass filter 13 can be prevented. The band-pass filter 13 can be configured according to actual needs to filter out the out-of-band interference signals.

Then, the signal is sent to a preamplifier (low noise amplifier 15), which has the advantages of low noise coefficient, low distortion, and the like, can be controlled to be enabled or disabled according to the magnitude of the input signal, and when the preamplifier is enabled, amplification of about 15dB can be generated, so that the sensitivity of the whole channel is improved.

After passing through the preamplifier, the signal goes to a step attenuator 17. When the signal is too large, the step attenuator 17 operates first, and the noise coefficient deteriorates by 1-2 dB within the attenuation range of 1-3 dB, so that the dynamic range of about 1dB can be improved.

After passing through the step attenuator 17, the signal goes to a high speed ADC. With the development of integrated circuit technology, the conversion rate of the 16-bit ADC can reach more than 100MSPS, and the requirement of short-wave frequency band radio frequency direct sampling can be met.

The method for calculating the reference sensitivity of the miniaturized high-sensitivity large-dynamic broadband receiving device comprises the following steps:

according to the formula S-174 +10lgB + NF + SNR, the reference sensitivity is mainly determined by the noise figure, the lower the noise figure, the higher the sensitivity. Through simulation, the system noise coefficient NF is less than or equal to 10.55dB, the corresponding sensitivity is better than S-174 +10lg3000+10.55+ 12-116.67 (dBm), the actual test value is less than or equal to-120 dBm and is far higher than the traditional superheterodyne receiver-116 dBm.

The dynamic range calculation method of the miniaturized high-sensitivity large-dynamic broadband receiving device comprises the following steps:

dynamic range refers to the ability of a receiver to monitor both large and small signals. Through the test, the gain of the whole machine channel is about 21dB, the saturation level of the ADC is about +7dBm, and therefore, the saturation level of the whole machine is as follows: and the +7-21 is-14 dBm, a margin of 6dB is reserved, and the dynamic range of the whole machine is about 100dB (the small signal output signal power is 12 dB).

The AGC (automatic gain control circuit) is an important component of the receiver and is composed of a step attenuator 17. When the input signal is too large, it can increase proper attenuation value to make the channel in linear working region and ensure AD not saturated, and when the input signal is too small, it can release attenuation value to raise receiving sensitivity and make the input signal of receiver be in a balanced state.

The low noise amplifier 15 is turned off by connecting the moving terminal and the second fixed terminal of the first single pole double throw switch 14 and the moving terminal and the second fixed terminal of the second single pole double throw switch 16. The flexibility of AGC is increased by a method of enabling or closing the low noise amplifier 15, and the simulation shows that the integral noise coefficient is only increased by 1dB at the moment of LNA switching, so that the requirements can be met.

The miniaturized high-sensitivity large-dynamic broadband receiving device is mainly applied to a new generation of short-wave broadband communication receiver and a reconnaissance receiver.

Compared with the prior art, the integrated circuit is used for replacing the traditional discrete component, so that the power consumption of the whole machine is lower than that of the original machine, the size is small, the complexity is reduced, and the corresponding degree is reduced.

The above-mentioned specific implementation is the preferred embodiment of the present invention, can not be right the utility model discloses the limit, any other does not deviate from the technical scheme of the utility model and the change or other equivalent replacement modes of doing all contain within the scope of protection of the utility model.

Claims

1. A miniaturized high-sensitivity large-dynamic broadband receiving device is characterized in that the broadband receiving device adopts an integrated circuit, and the integrated circuit comprises: the device comprises an antenna, a protection circuit, a band-pass filter, a low-noise amplifier, a step attenuator and an analog-to-digital converter;

the antenna, the protection circuit and the band-pass filter are sequentially connected, the output end of the band-pass filter is connected with the movable end of the first single-pole double-throw switch, the first immovable end of the first single-pole double-throw switch is connected with the input end of the low-noise amplifier, the second immovable end of the first single-pole double-throw switch is connected with the second immovable end of the second single-pole double-throw switch, the output end of the low-noise amplifier is connected with the first immovable end of the second single-pole double-throw switch, the movable end of the second single-pole double-throw switch is connected with the input end of the step attenuator, and the output end of the step attenuator is connected with the analog-to-digital converter.

2. The miniaturized high-sensitivity large-dynamic broadband receiving device according to claim 1, wherein: the protection circuit comprises a gas discharge tube, a current limiter, a clamping diode and an amplitude limiter which are connected in sequence;

the gas discharge tube is used for inhibiting the surge voltage of hundreds of volts to tens of thousands of volts;

the current limiter is used for carrying out secondary protection on the transient large signal;

the clamping diode is used for limiting a signal to be below 3V;

the limiter is used for limiting the output signal to be about +11 dBm.

3. The miniaturized high-sensitivity large-dynamic broadband receiving device according to claim 2, characterized in that: the clamp diode includes 4 BAS216 tubes.