CN113949397B - Gain-adjustable anti-interference broadband receiver - Google Patents
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Abstract
The invention discloses a gain-adjustable anti-interference broadband receiver, which comprises modes of automatically adjusting gain and manually adjusting gain, wherein a main control module automatically controls a numerical control attenuator and a variable gain amplifier to be the process of automatically adjusting the gain of the receiver, and an external control module manually adjusts the numerical control attenuator and the variable gain amplifier to be the process of manually adjusting the gain of the receiver.
Description
Technical Field
The invention relates to the technical field of receivers, in particular to an anti-interference broadband receiver with adjustable gain.
Background
The receiver is an indispensable component in the field of wireless communication, the normal work of communication equipment such as radar, satellite, broadcasting and the like can not be separated from the receiver, and the receiver mainly carries out frequency conversion processing on received high-frequency signals and changes the high-frequency signals into intermediate-frequency signals with lower frequency and capable of directly carrying out AD sampling processing. The performance level of the receiver directly determines the quality of the received signal.
With the development of technology and the improvement of chip manufacturing level, the performance index of the receiver is higher and higher. However, some performance indicators of the receiver are mutually restrictive, for example, increasing the gain reduces the noise figure of the whole receiver, but increasing the gain simultaneously results in reducing the dynamic range of the receiver. In addition, as more and more frequency bands are used in commercial use, the electromagnetic environment is more and more complex, so that the requirement on the performance index of the receiver in the complex electromagnetic environment is continuously improved, and the finding of a balance among the performance indexes is more complex.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the anti-interference broadband receiver with adjustable gain, which has the characteristics of adjustable gain, anti-interference and large dynamic range and can meet the performance index requirements of the receiver in a complex electromagnetic environment.
In order to achieve the purpose, the invention adopts the following technical scheme that:
an anti-interference broadband receiver with adjustable gain comprises the following components: the system comprises a receiving antenna, a numerical control attenuator, a switch filter bank, a primary frequency conversion processing module, a variable gain amplifier, a secondary frequency conversion processing module, an intermediate frequency output processing module, a main control module and a detection module;
the receiving antenna is used for receiving signals and sending the received signals to the numerical control attenuator; the digital control attenuator, the switch filter bank, the primary frequency conversion processing module, the variable gain amplifier, the secondary frequency conversion processing module and the intermediate frequency output processing module are sequentially connected according to the transmission direction of signals, and are used for sequentially processing the signals received by the receiving antenna to obtain intermediate frequency signals, and the intermediate frequency signals are output by the intermediate frequency output processing module;
the intermediate frequency output processing module is connected with the main control module, and an output signal of the intermediate frequency output processing module, namely an intermediate frequency signal, is sent to the main control module;
the primary frequency conversion processing module is connected with the detection module, an output signal of the primary frequency conversion processing module, namely a primary frequency conversion signal, is sent to the detection module, and the detection module is used for detecting the output signal of the primary frequency conversion processing module to obtain a detection signal;
the detection module is connected with the main control module, and an output signal of the detection module, namely a detection signal, is sent to the main control module;
the main control module is connected with the variable gain amplifier and automatically controls the signal amplification amount of the variable gain amplifier according to the output signal of the intermediate frequency output processing module;
the main control module is connected with the numerical control attenuator and automatically controls the signal attenuation of the numerical control attenuator according to the output signal of the detection module.
The main control module is provided with a power saturation value of a primary variable frequency signal and a power saturation value of an intermediate frequency signal;
the main control module calculates and processes an output signal of the intermediate frequency output processing module, namely an intermediate frequency signal, calculates the power of the intermediate frequency signal, and reduces the signal amplification amount of the variable gain amplifier if the power of the intermediate frequency signal reaches the power saturation value of the intermediate frequency signal, namely the power of the intermediate frequency signal reaches the saturation state;
the main control module calculates and processes the output signal of the detection module, namely the detection signal, calculates the power of the detection signal, and increases the signal attenuation of the numerical control attenuator if the power of the detection signal reaches the power saturation value of the primary variable frequency signal, namely the power of the detection signal reaches the saturation state.
The receiver further comprises: a status indication module;
the state indicating module is connected with the main control module, and the main control module sends the power saturation state of the detection signal and the power saturation state of the intermediate frequency signal to the state indicating module respectively for displaying.
The receiver further comprises: an external control module;
the external control module is respectively connected with the variable gain amplifier and the numerical control attenuator and is used for manually controlling the signal amplification amount of the variable gain amplifier and the signal attenuation amount of the numerical control attenuator.
The user manually controls the signal attenuation of the numerical control attenuator through the external control module according to the power saturation state of the detection signal displayed by the state indicating module, and if the power of the detection signal reaches the saturation state, the signal attenuation of the numerical control attenuator is increased;
and the user manually controls the signal amplification amount of the variable gain amplifier through the external control module according to the power saturation state of the intermediate frequency signal displayed by the state indicating module, and reduces the signal amplification amount of the variable gain amplifier if the power of the intermediate frequency signal reaches the saturation state.
The master control module is also connected with the switch filter bank and controls the switches of all the filters in the switch filter bank.
The receiver also comprises an amplitude limiting low-noise amplifier module; the amplitude limiting low-noise amplifier module comprises an amplitude limiter and a low-noise amplifier which are sequentially connected according to the transmission direction of the signal;
the receiving antenna is connected with the numerical control attenuator through the amplitude limiting low-noise amplifier module, and the receiving antenna sends the received signals to the numerical control attenuator through the amplitude limiting low-noise amplifier module.
The receiver further comprises a frequency source;
the frequency source is used for generating a first local oscillator signal of the primary frequency conversion processing module and a second local oscillator signal of the secondary frequency conversion processing module; the frequency source is connected with the main control module, and the main control module is used for controlling the frequency source to generate a local oscillator signal of the primary frequency conversion processing module and a local oscillator signal of the secondary frequency conversion processing module.
The secondary frequency conversion signal output by the secondary frequency conversion processing module is an intermediate frequency signal, and the intermediate frequency output processing module is used for further processing the intermediate frequency signal, including amplification, filtering and orthogonal phase demodulation.
The intermediate frequency output processing module is connected with the main control module through a first AD conversion module, and output signals of the intermediate frequency output processing module are subjected to AD sampling through the first AD conversion module and then are sent to the main control module; the detection module is connected with the main control module through a second AD conversion module, and an output signal of the detection module, namely a detection signal, is subjected to AD sampling through the second AD conversion module and then is sent to the main control module; the main control module is connected with the variable gain amplifier through the DA conversion module and the driving circuit in sequence.
The invention has the advantages that:
(1) The invention comprises automatic gain adjustment and manual gain adjustment, realizes the adjustment of the gain of the whole receiving channel by single automatic gain adjustment, or single manual gain adjustment, or the matching of the automatic gain adjustment and the manual gain adjustment, can carry out gain adjustment according to the actual requirement when in use, realizes the characteristics of gain adjustment, interference resistance and large dynamic range by various gain adjustment modes, and can meet the requirement of the receiver on performance indexes in a complex electromagnetic environment.
(2) When the power of the detection signal is overlarge, namely equivalent to the power of a primary variable frequency signal, the signal is attenuated by the numerical control attenuator; when the output signal power of the intermediate frequency output processing module is overlarge, namely equivalent to the overlarge power of the intermediate frequency signal, the amplification amount of the variable gain amplifier to the signal is reduced; the invention ensures that the receiver works in a linear range and the power of the intermediate frequency signal output by the receiver is in a set power range by reasonably controlling the digital controlled attenuator and the variable gain amplifier.
(3) The first frequency conversion processing module and the second frequency conversion processing module both comprise a frequency mixer and a filter, and because signals generated after the local oscillation signals and the radio frequency signals enter the frequency mixer for frequency mixing and various subharmonics generated by the frequency mixing exist in the frequency mixing output signals, the filters are introduced for filtering.
(4) Because the gain and the noise coefficient of the first-stage device determine the noise coefficient of the whole receiver, and the noise coefficient of the later-stage device has relatively small influence, the digital control attenuator is not directly connected with the receiving antenna, but is connected through the amplitude limiting low-noise amplifier module, so that the noise coefficient of the whole receiver is reduced. The limiter is used for limiting the power of the input signal below a certain fixed value so as to prevent the excessive power of the input signal from damaging a low noise amplifier and devices behind the module, and also prevent self-excitation and noise wave generation caused by the excessive power of the signal.
(5) In the invention, on the whole design of the receiver, different modules are mutually shielded structurally, and a circulator and an isolator can be added if necessary, thereby meeting the requirement of isolation. Signals with different frequencies can be arranged in different closed cavities, so that the space radiation is reduced. For the power supply of each active device in the receiver, under the condition of external power supply, various power supply chips can be used for voltage conversion. Decoupling and filtering the converted voltage, and then accessing each active device of the receiver, so as to make isolation of the power supply and prevent mutual crosstalk caused by signal leakage of the power supply.
Drawings
Fig. 1 is a schematic structural diagram of an anti-interference broadband receiver with adjustable gain.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The anti-interference broadband receiver with the adjustable gain comprises modes of automatically adjusting the gain and manually adjusting the gain, the gain which is received in the whole receiver can be adjusted through independent automatic gain adjustment, or independent manual gain adjustment, or the matching of the automatic gain adjustment and the manual gain adjustment, and the gain can be adjusted according to actual requirements during use.
As shown in fig. 1, an anti-interference wideband receiver with adjustable gain includes the following components: the device comprises a receiving antenna 1, an amplitude limiting low-noise amplifier module 2, a numerical control attenuator 3, a switch filter bank 4, a primary frequency conversion processing module 5, a variable gain amplifier 6, a secondary frequency conversion processing module 7, an intermediate frequency output processing module 8, a first AD conversion module 9, a main control module 10, a detection module 11, a second AD conversion module 12, a DA conversion module 13, a driving circuit module 14, a state indication module 15, an external control module 16 and a frequency source 17.
The receiving antenna 1, the amplitude limiting low-noise amplifier module 2, the numerical control attenuator 3, the switch filter bank 4, the primary frequency conversion processing module 5, the variable gain amplifier 6, the secondary frequency conversion processing module 7 and the intermediate frequency output processing module 8 are sequentially connected according to the transmission direction of the signals, and sequentially process the signals received by the receiving antenna 1, namely the high-frequency analog signals, so that the signals are changed into intermediate frequency analog signals with lower frequency, which can be directly subjected to AD sampling processing, and the intermediate frequency analog signals are output by the intermediate frequency output processing module 8.
The receiving antenna 1 is used for receiving signals and sending the received signals to the amplitude limiting low-noise amplifier module 2;
the amplitude limiting low-noise amplifier module 2 comprises an amplitude limiter and a low-noise amplifier which are connected in sequence, and the signals enter the numerical control attenuator 3 after being subjected to amplitude limiting of the amplitude limiter and amplification of the low-noise amplifier, namely, the output signals of the amplitude limiting low-noise amplifier module 2 enter the numerical control attenuator 3.
The limiter is used for limiting the power of the input signal below a certain fixed value, so as to prevent the power of the input signal from being too high, damage a low noise amplifier behind and devices behind the module, and also prevent self-excitation and noise generation caused by the too high signal power.
In the invention, the amplitude limiter with low insertion loss is selected as much as possible, and the low-noise amplifier is directly connected without any other treatment after the amplitude limiter. The limiter should be selected reasonably according to the power endurance index of the low noise amplifier and other devices.
According to the cascade calculation formula of the noise coefficient of the receiver, the gain and the noise coefficient of the first-stage device determine the noise coefficient of the whole receiver, and the noise coefficient of the later-stage device has relatively small influence. As such, the present invention does not directly connect the digitally controlled attenuator 3 to the receiving antenna 1, i.e., does not place the digitally controlled attenuator 3 directly at the very front of the receiver. However, this approach reduces the dynamic range of the receiver, and tends to cause saturation of the low noise amplifier in the first stage device, i.e., the clipping low noise amplifier module 2, when the external signal is large. Therefore, according to the calculation formula of the linear dynamic range of the receiver, in the specific implementation process, the low noise amplifier with the higher power of the 1dB compression point should be selected according to the specific performance index requirement, so as to ensure that the dynamic range of the whole receiver meets the performance index requirement.
In addition, since the operating frequency of the receiver front-end is high, a high-integration bare chip of the limiter and the low-noise amplifier is the best choice, and a combined module of the low-noise amplifier and the limiter existing in the market at present can also be selected.
The numerical control attenuator 3 is used for attenuating signals, and output signals of the numerical control attenuator 3 enter the switch filter bank 4.
When the signal power is overlarge, the numerical control attenuator 3 attenuates the signal and is used for ensuring that the receiver works in a linear range.
In the invention, because the numerical control attenuator 3 is still positioned at the front end of a receiver with higher frequency, the numerical control attenuator 3 also selects a bare chip with high integration level as much as possible, the attenuation range of the numerical control attenuator 3 can be selected according to the specific dynamic range requirement, but the attenuation precision of the attenuator can be determined according to the requirements. When the numerical control attenuator 3 is used, attention needs to be paid to the structural layout of the attenuator, and the structural layout of the attenuator is simulated so as to avoid leakage in practical application and influence on attenuation effect, and further avoid more clutter interference generated by a rear-stage device and influence on performance indexes of a receiver.
The switch filter bank 4 is used for carrying out segmented filtering processing on the signals, filtering noise waves, and the output signals of the switch filter bank 4 enter the primary frequency conversion processing module 5.
The switch filter bank 4 switches different pass-band ranges according to different frequencies of input signals, and filters interference signals outside the pass-band ranges, namely clutter, wherein the clutter refers to a series of waves capable of generating in-band high-order intermodulation, and some clutter can appear within the bandwidth of an intermediate frequency signal after frequency mixing, or harmonic waves generated by the clutter frequency mixing can appear within the bandwidth of the intermediate frequency signal and are difficult to process.
In terms of performance, the more channels of the switch filter bank 4 are, the more effective the clutter removal is, and the better the anti-interference performance is. In the invention, a traditional filter bank can be selected, and a switch filter bank packaged by a chip can also be selected. However, the conventional filter bank is large in size, and a chip-type switch filter bank is selected as much as possible in consideration of the whole size cost of the receiver.
The primary frequency conversion processing module 5 is used for performing primary frequency conversion processing on the signal to obtain a primary frequency conversion signal, and the primary frequency conversion signal is coupled into two paths of output which respectively enter the variable gain amplifier 6 and the detection module 11.
The detection module 11 performs detection processing on the output signal of the primary frequency conversion processing module 5 to obtain a detection signal, and sends the detection signal to the main control module 10 through the second AD conversion module 12.
The variable gain amplifier 6 is used for amplifying the primary frequency conversion signal, and the output signal of the variable gain amplifier 6 enters the secondary frequency conversion processing module 7.
The variable gain amplifier 6 can change the signal amplification amount during its operation under the control of software according to the power condition of the signal.
The secondary frequency conversion processing module 7 is configured to perform secondary frequency conversion processing on the signal to obtain a secondary frequency conversion signal, i.e., an intermediate frequency signal, and an output signal of the secondary frequency conversion processing module 7, i.e., the intermediate frequency signal, enters the intermediate frequency output processing module 8.
The intermediate frequency output processing module 8 is used for further processing the intermediate frequency signal according to actual needs, and may be formed by operations of amplification, filtering, phase shifting, quadrature discrimination and the like, and the intermediate frequency output processing module 8 is specifically designed according to different types of receivers. The intermediate frequency signal processed by the intermediate frequency output processing module 8 can be directly sampled by the first AD conversion module 9.
In the invention, the primary frequency conversion processing module 5 and the secondary frequency conversion processing module 7 both comprise a mixer and a filter. Because signals generated after the local oscillation signals and the radio frequency signals enter the frequency mixer for frequency mixing and various harmonics generated by the frequency mixing exist in the frequency mixing output signals, a filter is introduced for filtering.
The first local oscillator signal of the primary frequency conversion processing module 5 and the second local oscillator signal of the secondary frequency conversion processing module 7 are both generated by a frequency source 17, the frequency source is connected with a main control module 10, and the main control module 10 is used for controlling the frequency source 17 to generate the first local oscillator signal of the primary frequency conversion processing module 5 and the second local oscillator signal of the secondary frequency conversion processing module 7. In this embodiment, the frequency source 17 is a broadband frequency source, and a frequency source with good performance indexes, such as low phase noise, low spurious, and high frequency accuracy, is selected to ensure that the performance of the entire receiver is excellent and the indexes are stable.
In the invention, the power saturation value of a primary frequency conversion signal is calculated according to the device parameters of a low noise amplifier in an amplitude limiting low noise amplification module 2 at the front end of a receiver and the device parameters of a mixer and a filter in a primary frequency conversion processing module 5; and calculating the power saturation value of the intermediate frequency signal output according to the device parameters in the intermediate frequency output processing module 8 and the device parameters of the mixer and the filter in the secondary frequency conversion processing module 7. The main control module 10 is respectively provided with a power saturation value of the primary frequency conversion signal and a power saturation value of the intermediate frequency signal output.
The main control module 10 is connected with the numerical control attenuator 3 and is used for automatically controlling the signal attenuation of the numerical control attenuator 3.
The main control module 10 calculates the detection signal, calculates the power of the detection signal, that is, calculates the power of a primary frequency-conversion signal, thereby obtaining the signal power state after the primary frequency-conversion processing, the main control module 10 automatically controls the signal attenuation of the numerical control attenuator 3 according to the power of the detection signal, and increases the signal attenuation of the numerical control attenuator 3 if the power of the detection signal reaches the power saturation value of the primary frequency-conversion signal, that is, the power of the detection signal reaches the saturation state, thereby increasing the signal attenuation.
The intermediate frequency output processing module 8 is connected with the main control module 10 through the first AD conversion module 9, and output signals of the intermediate frequency output processing module 8 are converted into digital signals to be sent to the main control module 10 after being subjected to AD sampling through the first AD conversion module 9.
The main control module 10 is connected to the variable gain amplifier 6, and is configured to automatically control the signal amplification amount of the variable gain amplifier 6. In the present invention, the variable gain amplifier 6 is a variable gain amplifier controlled by an analog signal, and the main control module 10 controls the variable gain amplifier 6 through the DA conversion module 13 and the driving circuit 14, that is, the main control module 10 is connected to the DA conversion module 13 and is connected to the variable gain amplifier 6 through the DA conversion module 13 and the driving circuit 14 in sequence. In this embodiment, the driving circuit 14 employs a follower or a related power management chip, and the driving circuit 14 needs to ensure the performance of power isolation.
The main control module 10 calculates an output signal of the intermediate frequency output processing module 8, i.e., an intermediate frequency signal, and calculates power of the intermediate frequency signal, the main control module 10 automatically controls the signal amplification amount of the variable gain amplifier 6 according to the power of the intermediate frequency signal, and if the power of the intermediate frequency signal reaches a power saturation value of the intermediate frequency signal, i.e., the power of the intermediate frequency signal reaches a saturation state, the signal amplification amount of the variable gain amplifier 6 is reduced, so that the amplification power of the signal is reduced. On the contrary, when the power of the intermediate frequency signal is too small, the signal amplification amount of the variable gain amplifier 6 is increased, thereby increasing the signal amplification power.
The main control module 10 is further connected to the switch filter bank 4, and is configured to automatically control each switch of the switch filter bank 4. Clutter interference in space is filtered out by switching of the switched filter bank 4.
The main control module 10 is further connected to a state indication module 15, and the state indication module 15 is configured to respectively indicate the state of the power of the signal output by the frequency output processing module 8 and the state of the power of the signal after the primary frequency conversion processing, that is, the power of the detection signal, and can respectively indicate the power saturation state of the intermediate frequency signal and the power saturation state of the detection signal.
An external control module 16 is also connected to the variable gain amplifier 6 for manually controlling the amount of signal amplification of the variable gain amplifier 6. In the present invention, the variable gain amplifier 6 is a variable gain amplifier controlled by an analog signal, and the external control module 16 also controls the variable gain amplifier 6 through the DA conversion module 13 and the driving circuit 14, that is, the external control module 16 is also connected to the DA conversion module 13 and is connected to the variable gain amplifier 6 through the DA conversion module 13 and the driving circuit 14 in sequence. The user manually controls the signal amplification amount of the variable gain amplifier 6 through the external control module 16 according to the power state of the intermediate frequency signal indicated by the state indicating module 15, and reduces the signal amplification amount of the variable gain amplifier 6 if the power of the intermediate frequency signal reaches the power saturation value of the intermediate frequency signal, thereby reducing the signal amplification power. On the contrary, when the power of the intermediate frequency signal is too small, the signal amplification amount of the variable gain amplifier 6 is increased, thereby increasing the signal amplification power.
The external control module 16 is also connected with the numerical control attenuator 3 and is used for manually controlling the signal attenuation of the numerical control attenuator 3. The user manually controls the signal attenuation amount of the numerical control attenuator 3 according to the power state of the detection signal indicated by the state indicating module 15, and increases the signal attenuation amount of the numerical control attenuator 3 when the power of the detection signal reaches the power saturation value of the primary variable frequency signal, thereby increasing the signal attenuation until the state indicating lamp indicates that the power of the detection signal is in an unsaturated state.
In the present invention, the automatic control of the digital controlled attenuator 3 and the variable gain amplifier 6 by the main control module 10 is the process of automatically adjusting the gain of the receiver, and the manual adjustment of the digital controlled attenuator 3 and the variable gain amplifier 6 by the external control module 16 is the process of manually adjusting the gain of the receiver.
In this embodiment, in the process of automatically adjusting the gain of the receiver, when the receiver is powered on and starts to work, the signal attenuation amount of the digital control attenuator 3 is 0dB, the signal amplification amount of the variable gain amplifier 6 is the maximum, the switch filter bank 4 is in a signal conduction state, and the output signal of the primary frequency conversion processing module 5 is detected by the detection module 11 and then calculated by the main control module 10 to obtain the power of the detection signal.
Calculating a power saturation value of a primary frequency conversion signal according to device parameters of a low noise amplifier in an amplitude limiting low noise amplification module 2 at the front end of the receiver and device parameters of a mixer and a filter in a primary frequency conversion processing module 5; and calculating the power saturation value of the intermediate frequency signal according to the device parameters in the intermediate frequency output processing module 8 and the device parameters of the mixer and the filter in the secondary frequency conversion processing module 7.
The main control module 10 is respectively provided with a power saturation value of the primary variable frequency signal and a power saturation value of the intermediate frequency signal, and if the power value of the detection signal reaches the power saturation value of the primary variable frequency signal, it indicates that the power of the primary variable frequency signal at the previous stage of the receiver is saturated, and the main control module 10 increases the signal attenuation of the digital controlled attenuator 3. If the power value of the output signal of the intermediate frequency output processing module 8, that is, the power value of the intermediate frequency signal reaches the power saturation value of the intermediate frequency signal, it indicates that the power of the intermediate frequency signal is saturated, and the main control module 10 controls the signal amplification amount of the variable gain amplifier 6, specifically, reduces the signal amplification amount of the variable gain amplifier 6.
The power of the output signal of the intermediate frequency output processing module 8 reaches the power saturation value of the intermediate frequency signal, which means that the power of the intermediate frequency signal is within the error range of the set output power value, that is, the purpose of adjusting the gain is achieved, the output power is achieved, and the internal state of the receiver tends to be stable. In setting the error range of the actual output power value, it is noted that the power of the intermediate frequency signal cannot be greater than the set power saturation value of the intermediate frequency signal.
In this embodiment, in the process of manually adjusting the gain of the receiver, after the receiver starts to operate, the state indicating module 15 indicates whether the power of the signal output by the detecting module 11 reaches the power saturation value of the primary frequency conversion signal, and indicates whether the power of the signal output by the intermediate frequency output processing module 8 reaches the power saturation value of the intermediate frequency signal. In this embodiment, three LED lamps may be used for indicating, and the on and off of the two LED lamps respectively indicate whether the power of the output signal of the detection module 11 and the power of the output signal of the intermediate frequency output processing module 8 reach saturation. The external control module 16 can adopt a key keyboard, the area of the key keyboard is divided, one part is used for controlling the numerical control attenuator 3, the other part is used for controlling the variable gain amplifier 6, a binary matrix keyboard style of 1,2,4,8,16 and 32 switch keys can be set, and the coding control from 0 to 63 can be realized. The control of the numerical control attenuator 3 and the variable gain amplifier 6 can set the working state of the numerical control attenuator 3 and the variable gain amplifier 6 by a user according to the judgment of the power saturation state. In addition, on the basis of the keys, a control automatic mode key switch and a control manual mode key switch are required to be added. By means of program design, a switch is respectively arranged for the numerical control attenuator and the variable gain amplifier, and two states of the switch correspond to two modes of automatic control and manual control. Therefore, the diversified control of the system is realized, and the reliability and the flexibility of the system work are improved.
In this embodiment, in the overall design of the receiver, different modules need to be shielded from each other structurally, and a circulator and an isolator may be added if necessary, so as to meet the requirement of isolation. Signals with different frequencies can be arranged in different closed cavities, so that space radiation is reduced. For the power supply of each active device in the receiver, under the condition of external power supply, various power supply chips can be used for voltage conversion. Decoupling and filtering the converted voltage, and then accessing each active device of the receiver, so as to make isolation of the power supply and prevent mutual crosstalk caused by signal leakage of the power supply.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An anti-interference broadband receiver with adjustable gain, characterized by comprising the following components: the system comprises a receiving antenna (1), a numerical control attenuator (3), a switch filter bank (4), a primary frequency conversion processing module (5), a variable gain amplifier (6), a secondary frequency conversion processing module (7), an intermediate frequency output processing module (8), a main control module (10) and a detection module (11);
the receiving antenna (1) is used for receiving signals and sending the received signals to the numerical control attenuator (3); the digital control attenuator (3), the switch filter bank (4), the primary frequency conversion processing module (5), the variable gain amplifier (6), the secondary frequency conversion processing module (7) and the intermediate frequency output processing module (8) are sequentially connected according to the transmission direction of signals, and are used for sequentially processing the signals received by the receiving antenna (1) to obtain intermediate frequency signals, and the intermediate frequency signals are output by the intermediate frequency output processing module (8);
the intermediate frequency output processing module (8) is connected with the main control module (10), and output signals of the intermediate frequency output processing module (8), namely intermediate frequency signals, are sent to the main control module (10);
the primary frequency conversion processing module (5) is connected with the detection module (11), an output signal of the primary frequency conversion processing module (5), namely a primary frequency conversion signal, is sent to the detection module (11), and the detection module (11) is used for detecting the output signal of the primary frequency conversion processing module (5) to obtain a detection signal;
the detection module (11) is connected with the main control module (10), and an output signal of the detection module (11), namely a detection signal, is sent to the main control module (10);
the main control module (10) is connected with the variable gain amplifier (6), and the main control module (10) automatically controls the signal amplification amount of the variable gain amplifier (6) according to the output signal of the intermediate frequency output processing module (8);
the main control module (10) is connected with the numerical control attenuator (3), and the main control module (10) automatically controls the signal attenuation of the numerical control attenuator (3) according to the output signal of the detection module (11);
the main control module (10) is internally provided with a power saturation value of a primary frequency conversion signal and a power saturation value of an intermediate frequency signal;
the main control module (10) calculates an output signal of the intermediate frequency output processing module (8), namely an intermediate frequency signal, calculates the power of the intermediate frequency signal, and reduces the signal amplification amount of the variable gain amplifier (6) if the power of the intermediate frequency signal reaches the power saturation value of the intermediate frequency signal, namely the power of the intermediate frequency signal reaches the saturation state;
the main control module (10) calculates the detection signal which is the output signal of the detection module (11), calculates the power of the detection signal, and increases the signal attenuation of the numerical control attenuator (3) if the power of the detection signal reaches the power saturation value of the primary variable frequency signal, namely the power of the detection signal reaches the saturation state.
2. The gain tunable antijam wideband receiver of claim 1 further including: a status indication module (15);
the state indicating module (15) is connected with the main control module (10), and the main control module (10) respectively sends the power saturation state of the detection signal and the power saturation state of the intermediate frequency signal to the state indicating module (15) for display.
3. The gain-tunable, interference-free wideband receiver of claim 2, further comprising: an external control module (16);
the external control module (16) is respectively connected with the variable gain amplifier (6) and the numerical control attenuator (3) and is used for manually controlling the signal amplification amount of the variable gain amplifier (6) and the signal attenuation amount of the numerical control attenuator (3);
the user manually controls the signal attenuation amount of the numerical control attenuator (3) through an external control module (16) according to the power saturation state of the detection signal displayed by the state indicating module (15), and if the power of the detection signal reaches the saturation state, the signal attenuation amount of the numerical control attenuator (3) is increased;
the user manually controls the signal amplification amount of the variable gain amplifier (6) through the external control module (16) according to the power saturation state of the intermediate frequency signal displayed by the state indicating module (15), and reduces the signal amplification amount of the variable gain amplifier (6) if the power of the intermediate frequency signal reaches the saturation state.
4. The anti-interference wideband receiver with adjustable gain according to claim 1, characterized in that the master control module (10) is further connected to the switch filter bank (4), and the master control module (10) controls the switches of the filters in the switch filter bank (4).
5. The anti-interference broadband receiver with adjustable gain of claim 1 is characterized by further comprising a clipping low-noise amplifier module (2); the amplitude limiting and low-noise amplifier module (2) comprises an amplitude limiter and a low-noise amplifier which are sequentially connected according to the transmission direction of signals;
the receiving antenna (1) is connected with the numerical control attenuator (3) through the amplitude limiting low-noise amplifier module (2), and the receiving antenna (1) sends the received signals to the numerical control attenuator (3) through the amplitude limiting low-noise amplifier module (2).
6. The gain-tunable, interference-free wideband receiver of claim 1, further comprising a frequency source (17);
the frequency source (17) is used for generating a local oscillator signal of the primary frequency conversion processing module (5) and a second local oscillator signal of the secondary frequency conversion processing module (7); the frequency source is connected with the main control module (10), and the main control module (10) is used for controlling the frequency source (17) to generate a local oscillation signal of the primary frequency conversion processing module (5) and a local oscillation signal of the secondary frequency conversion processing module (7).
7. The anti-interference wideband receiver with adjustable gain according to claim 1, wherein the twice-converted signal output by the twice-conversion processing module (7) is an intermediate frequency signal, and the intermediate frequency output processing module (8) is configured to further process the intermediate frequency signal, including amplification, filtering, and quadrature phase demodulation.
8. The anti-interference broadband receiver with adjustable gain according to claim 1, wherein the intermediate frequency output processing module (8) is connected to the main control module (10) through a first AD conversion module (9), and an output signal of the intermediate frequency output processing module (8) is AD-sampled by the first AD conversion module (9) and then sent to the main control module (10); the detection module (11) is connected with the main control module (10) through the second AD conversion module (12), and output signals of the detection module (11), namely detection signals, are subjected to AD sampling through the second AD conversion module (12) and then are sent to the main control module (10); the main control module (10) is connected with the variable gain amplifier (6) through the DA conversion module (13) and the drive circuit (14) in sequence.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1758779A (en) * | 2004-10-10 | 2006-04-12 | 中兴通讯股份有限公司 | Automatic gain control method and device for array antenna base station of time-division duplex system |
| CN203537380U (en) * | 2013-11-11 | 2014-04-09 | 中国电子科技集团公司第五十四研究所 | Miniature microwave transmitting-receiving channel device |
| CN204190712U (en) * | 2014-09-18 | 2015-03-04 | 天津七一二通信广播有限公司 | A kind of ultrashort wave radio set automatic gain control circuit |
| CN112564726A (en) * | 2020-11-25 | 2021-03-26 | 电子科技大学 | Receiver broadband large dynamic automatic gain control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107786213B (en) * | 2017-11-02 | 2019-07-30 | 深圳市桑达无线通讯技术有限公司 | A kind of device promoting interference free performance |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1758779A (en) * | 2004-10-10 | 2006-04-12 | 中兴通讯股份有限公司 | Automatic gain control method and device for array antenna base station of time-division duplex system |
| CN203537380U (en) * | 2013-11-11 | 2014-04-09 | 中国电子科技集团公司第五十四研究所 | Miniature microwave transmitting-receiving channel device |
| CN204190712U (en) * | 2014-09-18 | 2015-03-04 | 天津七一二通信广播有限公司 | A kind of ultrashort wave radio set automatic gain control circuit |
| CN112564726A (en) * | 2020-11-25 | 2021-03-26 | 电子科技大学 | Receiver broadband large dynamic automatic gain control circuit |
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