CN110011678A - A kind of AGC system and method suitable for being mutated the superhet of channel - Google Patents
A kind of AGC system and method suitable for being mutated the superhet of channel Download PDFInfo
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- CN110011678A CN110011678A CN201910338548.XA CN201910338548A CN110011678A CN 110011678 A CN110011678 A CN 110011678A CN 201910338548 A CN201910338548 A CN 201910338548A CN 110011678 A CN110011678 A CN 110011678A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The AGC system and method that the invention discloses a kind of suitable for being mutated the superhet of channel, including radio frequency amplifying circuit, frequency mixer, local oscillator, IF amplifier circuit, simulation agc circuit, digital AGC circit, the first decision device, the second decision device and/or door；Wherein, IF amplifier circuit includes two-stage variable gain amplifier, respectively first order variable gain amplifier and second level variable gain amplifier；The simulation agc circuit, for controlling the amplification factor of first order variable gain amplifier；The digital AGC circit, for controlling the amplification factor of second level variable gain amplifier.The present invention jointly controls the amplification factor of the two-stage variable gain amplifier of IF amplifier circuit using simulation agc circuit and digital AGC circit, and also it regard the phase difference fluctuation degree that the digital phase-locked loop phase discriminator of carrier synchronization exports as AGC system input variable, it is short with gain control delay, feature with high accuracy is controlled, can quickly be controlled when channel is mutated.
Description
Technical field
The invention belongs to the automatic growth control fields of superhet, and in particular to a kind of suitable for being mutated channel
The AGC system and method for superhet.
Background technique
Superhet is that the sine wave signal generated using local oscillator is mixed with input signal, thus will
The method that frequency input signal is transformed into a certain predetermined intermediate frequency (abbreviation intermediate frequency).It is connect in superhet used at present
In receipts machine system, the extremely crucial subsystem of automatic growth control (AGC) system.In the prior art, automatic growth control (AGC)
Have using traditional AGC control technology, also has using digital AGC technology.
As shown in Figure 1, using the superhet of simulation AGC control technology, including radio frequency amplifier, frequency mixer, sheet
Ground oscillator, intermediate frequency amplifier and wave detector carry out detection output to the intermediate-freuqncy signal that intermediate frequency amplifier exports by wave detector
First AGC level E1 utilizes the amplification factor of variable gain amplifier in the first AGC level E1 control intermediate frequency amplifier；In general,
Dual-gate field-effect pipe or IC chip can be used in variable gain amplifier, the former is controlled by the first AGC level E1
One of grid of dual-gate field-effect pipe processed, Lai Shixian automatic growth control.
As shown in Fig. 2, process and simulation AGC control technology are basic using the superhet of digital AGC technology
Similar, difference is: intermediate-freuqncy signal is converted into digital medium-frequency signal through analog-digital converter (A/D), and then down coversion is converted into counting
The detection of word baseband signal, digital baseband signal is completed in digital signal processor, and number is included in digital signal processor
Wave detector, detection output are converted into analog signal through digital analog converter (D/A) and then obtain the 2nd AGC level through buffer
E2, to control the gain of intermediate frequency amplifier.
To sum up, using the superhet of simulation AGC control technology, although control delay is shorter, precision is controlled
Not high, dynamic range is relatively narrow；Using the superhet of digital AGC technology, has control delay longer, be not suitable for
The case where fast change of channel；Present invention seek to address that the above problem.
Summary of the invention
It is an object of the invention in view of the above problems and insufficient, propose a kind of suitable for being mutated the super outer of channel
The AGC system and method for poor reception machine jointly control intermediate frequency amplification using simulation agc circuit and digital AGC circit
The amplification factor of the two-stage variable gain amplifier of circuit, and the phase difference that the digital phase-locked loop phase discriminator of carrier synchronization is exported
Fluctuation degree is also used as AGC system input variable, has gain control delay short, controls feature with high accuracy, can be prominent in channel
It is quickly controlled when change.
To achieve the goals above, the technical solution adopted by the present invention is that: a kind of superhet suitable for being mutated channel connects
The AGC system of receipts machine, including radio frequency amplifying circuit, frequency mixer, local oscillator, IF amplifier circuit, simulation
Agc circuit, digital AGC circit, the first decision device, the second decision device and/or door；IF amplifier circuit includes two-stage variable gain
Amplifier and thereafter cascade level-one fixed gain amplifier, two-stage variable gain amplifier are respectively that first order variable gain is put
Big device and second level variable gain amplifier；
The simulation agc circuit, including analog detector and the first analog switch AS1, IF amplifier circuit export intermediate frequency
Signal to analog detector, analog detector detection exports the first AGC level E1, the first AGC level E1 and gain reset level
E0 is input to the first analog switch AS1, and the first control voltage V1 of the first analog switch AS1 output to first order variable gain is put
The gain control end of big device；First analog switch AS1, for realizing the switching of the first AGC level E1 and gain reset level E0；
The digital AGC circit, including analog-digital converter, digital signal processor and digital analog converter；Analog-digital converter,
Intermediate-freuqncy signal for exporting IF amplifier circuit is converted into digital medium-frequency signal；Digital signal processor, which includes that number is lower, to be become
Frequency device, range detector, digital phase-locked loop and phase difference fluctuation degree detector；
Digital down converter, including digital controlled oscillator, multiplier and filtering extraction module；Digital controlled oscillator is for generating two
The orthogonal sine wave signal in road, the orthogonal sine wave signal of two-way are input to two multipliers with digital medium-frequency signal respectively, and two
The output of a multiplier exports the orthogonal digital baseband signal of two-way through filtering extraction module respectively；
Range detector, for detecting the amplitude of two-way orthogonal digital baseband signal and exporting the amplitude of digital baseband signal
To digital analog converter, digital analog converter exports the 2nd AGC level E2, the 2nd AGC level E2 and gain reset level through buffer
E0 is input to the second analog switch AS2, and the second control voltage V2 of the second analog switch AS2 output to second level variable gain is put
The gain control end of big device；Second analog switch AS2, for realizing the switching of the 2nd AGC level E2 and gain reset level E0；
Digital phase-locked loop, including digital phase discriminator, digital loop filters and digital controlled oscillator；The orthogonal digital base of two-way
Band signal is input to digital phase discriminator, and digital phase discriminator exports the sine wave signal of digital medium-frequency signal and digital controlled oscillator output
Between phase difference, digital phase discriminator output phase difference signal to phase difference fluctuation degree detector, phase difference fluctuation degree detector
Phase difference output fluctuation degree detects level S；
Meanwhile analog detector exports the first AGC level E1 to the first decision device, the first decision device is for judging first
Whether AGC level E1 is less than pre-determined threshold level Ethd；Phase difference fluctuation degree detection level S is input to the second decision device, and second
Decision device is for judging whether phase difference fluctuation degree detection level S is greater than pre-determined threshold phase difference fluctuation degree level Sthd；First
Decision device and the second decision device output decision signal to or door or door output gain reset signal to the first analog switch AS1 and
Second analog switch AS2.
Above-mentioned technical proposal is further improved, radio frequency amplifying circuit includes sequentially connected first radio-frequency filter, penetrates
Audio amplifier and the second radio-frequency filter.
Further, first order variable gain amplifier and second level variable gain amplifier are all made of is imitated by bigrid field
Should pipe composition amplifying circuit.
Further, range detector includes two digital detectors, for detecting two-way orthogonal digital baseband signal
Amplitude, the amplitude of digital baseband signal are that the quadratic sum of the amplitude of two-way orthogonal digital baseband signal is made even root again.
The present invention also provides a kind of suitable for being mutated the automatic of the AGC system of the superhet of channel
Gain control method, for controlling the gain of IF amplifier circuit；IF amplifier circuit include two-stage variable gain amplifier and
Thereafter cascade level-one fixed gain amplifier, two-stage variable gain amplifier are respectively first order variable gain amplifier and
Second level variable gain amplifier；Using the amplification factor of simulation AGC technical controlling first order variable gain amplifier, using number
The amplification factor of AGC technical controlling second level variable gain amplifier；
The gain control method of first order variable gain amplifier are as follows: the intermediate-freuqncy signal of IF amplifier circuit output is carried out
Simulate detection, the amplification factor of the first AGC level E1 control first order variable gain amplifier of detection output；
The gain control method of second level variable gain amplifier are as follows: be converted into IF amplifier circuit output intermediate-freuqncy signal
Digital medium-frequency signal carries out the orthogonal digital baseband signal of Digital Down Convert processing output two-way to digital medium-frequency signal, passes through
The amplitude of detection two-way digital orthogonal baseband signal obtains the amplitude of digital medium-frequency signal and through digital-to-analogue conversion at analog signal output the
Two AGC level E2 control the amplification factor of second level variable gain amplifier by the 2nd AGC level E2；Meanwhile detecting number
The phase difference fluctuation degree between sine wave signal that digital controlled oscillator generates in intermediate-freuqncy signal and Digital Down Convert detects level S；
When the first AGC level E1 is less than pre-determined threshold level Ethd or phase difference fluctuation degree detection level S greater than pre- gating
When limiting phase difference fluctuation degree level Sthd, the gain of first order variable gain amplifier and second level variable gain amplifier is controlled
Reach maximum；In the case of remaining, the gain control end of first order variable gain amplifier is controlled using the first AGC level E1, the
The gain control end of two AGC level E2 control second level variable gain amplifier.
Beneficial effects of the present invention: the present invention carries out the amplitude of intermediate-freuqncy signal using simulation agc circuit and digital AGC circit
Detection, obtains two AGC level, controls the amplification factor of the two-stage variable gain amplifier of IF amplifier circuit respectively；Also,
In digital AGC circit, the phase difference in digital medium-frequency signal and Digital Down Convert between digital controlled oscillator output signal is detected
Phase difference fluctuation degree is also used as the input variable of AGC system by fluctuation degree；When phase difference fluctuation degree reaches a certain level, then
The gain of IF amplifier circuit is reset to maximum value.Under normal circumstances, amplitude detection needs low-pass filtering, and delay is greater than phase
The delay of position detection, therefore the present invention has the characteristics that gain control delay is short, and quick AGC control can be realized when channel is mutated
System.Further, since using simulation detection output, digital detection output and three variables of phase difference fluctuation degree as the defeated of AGC system
Enter variable implementation to jointly control, thus it is higher compared with conventional method to control precision；When simulation detection output is less than certain value or phase
When poor fluctuation degree is greater than certain value, then the gain of IF amplifier circuit is resetted, so that fast quick-recovery receiver is to faint input
Effective reception of signal；In the case of remaining, two-stage is controlled by simulation detection output level and digital detection output level respectively
The amplification factor of variable gain amplifier.
Detailed description of the invention
Fig. 1 is in the prior art using the superhet structure simplified block diagram of simulation AGC technology；
Fig. 2 is the superhet structure simplified block diagram for using digital AGC technology in the prior art；
Fig. 3 is the AGC system structure chart of the superhet of the present invention for being suitable for being mutated channel.
Specific embodiment
To keep the content of the invention clearer, with reference to the accompanying drawing, to the specific embodiment of the invention
It is described in further detail.It should be noted that for purposes of clarity, being omitted in attached drawing and explanation unrelated with the invention
, the expression and description of component known to persons of ordinary skill in the art.
Embodiment 1:
The present invention provides a kind of AGC system suitable for being mutated the superhet of channel, such as Fig. 3 institute
Show, including radio frequency amplifying circuit, frequency mixer, local oscillator, IF amplifier circuit, simulation agc circuit, digital AGC circit, the
One decision device, the second decision device and/or door；Radio frequency amplifying circuit includes sequentially connected first radio-frequency filter, radio frequency amplifier
With the second radio-frequency filter, IF amplifier circuit includes sequentially connected first intermediate-frequency filter, in intermediate frequency amplifier and second
Frequency filter, the local oscillation signal that rf modulated signal generates after radio frequency amplifying circuit filter and amplification filters again with local oscillator
Mixing, mixer output signal export intermediate-freuqncy signal after IF amplifier circuit filter and amplification filters again.Wherein, intermediate frequency amplifier packet
Two-stage variable gain amplifier and thereafter cascade level-one fixed gain amplifier are included, two-stage variable gain amplifier is respectively
Level-one variable gain amplifier and second level variable gain amplifier；First order variable gain amplifier and second level variable gain
Amplifier is all made of the amplifying circuit being made of dual-gate field-effect pipe, and fixed gain amplifier uses triode, field-effect tube
Or integrated circuit.
The simulation agc circuit, including analog detector and the first analog switch AS1, IF amplifier circuit export intermediate frequency
Signal to analog detector, analog detector detection exports the first AGC level E1, the first AGC level E1 and gain reset level
E0 is input to the first analog switch AS1, and the first control voltage V1 of the first analog switch AS1 output to first order variable gain is put
The gain control end of big device；First analog switch AS1, for realizing the switching of the first AGC level E1 and gain reset level E0.
The digital AGC circit, including analog-digital converter (A/D), digital signal processor and digital analog converter (D/A)；
Analog-digital converter (A/D), the intermediate-freuqncy signal for exporting IF amplifier circuit are converted into digital medium-frequency signal；At digital signal
Managing device includes digital down converter, range detector, digital phase-locked loop and phase difference fluctuation degree detector.
Digital down converter, including digital controlled oscillator, multiplier and filtering extraction module；Digital controlled oscillator is for generating two
The orthogonal sine wave signal in road, the orthogonal sine wave signal of two-way are input to two multipliers with digital medium-frequency signal respectively, and two
The output of a multiplier exports the orthogonal digital baseband signal of two-way through filtering extraction module respectively；Filtering extraction module, is used for
Low-pass digital filter and sampling, the lower number of output data rate are implemented to the orthogonal two paths of signals of two-way multiplier output
Word baseband signal.
Range detector, for detecting the amplitude of two-way orthogonal digital baseband signal and exporting the amplitude of digital baseband signal
To digital analog converter；Range detector includes two digital detectors, for detecting the amplitude of two-way orthogonal digital baseband signal,
The amplitude of digital baseband signal is that the quadratic sum of the amplitude of two-way orthogonal digital baseband signal is made even root again.Digital analog converter
(D/A) convert digital signals into analog signal output, then through buffer export the 2nd AGC level E2, the 2nd AGC level E2 and
Gain reset level E0 is input to second analog switch AS2, the second analog switch AS2 the second control of output voltage V2 to second
The gain control end of grade variable gain amplifier；Second analog switch AS2 resets for realizing the 2nd AGC level E2 and gain
The switching of level E0；
Digital phase-locked loop, including digital phase discriminator, digital loop filters and digital controlled oscillator, digital phase-locked loop are one
Output signal (digital controlled oscillator generation) is set to seek to protect in frequency and phase with input signal (input digital medium-frequency signal)
Hold synchronous circuit；Phase under carrier synchronization state, between the output signal and input digital medium-frequency signal of digital controlled oscillator
Potential difference keeps a certain steady state value under dynamic equilibrium；If deviating from the steady state value, mean carrier track step-out, phaselocked loop
The frequency for then controlling digital controlled oscillator makes above-mentioned phase difference be gradually brought to former steady state value, thus has and reach adaptive synchronicity
Function.In the present embodiment, the orthogonal digital baseband signal of two-way is input to digital phase discriminator, and digital phase discriminator extracts phase letter
Breath realizes phase demodulation, exports the phase difference between digital medium-frequency signal and the sine wave signal of digital controlled oscillator output, digital phase detection
For device output phase difference signal to phase difference fluctuation degree detector, the detection of phase difference fluctuation degree detector phase difference output fluctuation degree is electric
Flat S；
Meanwhile analog detector exports the first AGC level E1 to the first decision device, the first decision device is for judging first
Whether AGC level E1 is less than pre-determined threshold level Ethd；Phase difference fluctuation degree detection level S is input to the second decision device, and second
Decision device is for judging whether phase difference fluctuation degree detection level S is greater than pre-determined threshold phase difference fluctuation degree level Sthd；First
Decision device and the second decision device output decision signal to or door or door output gain reset signal to the first analog switch AS1 and
Second analog switch AS2.
The working principle of the invention: the intermediate-freuqncy signal of IF amplifier circuit output divides two-way to carry out simulation AGC processing respectively
With digital AGC processing, intermediate-freuqncy signal is by the first AGC level E1, the first AGC level E1 control of analog detector detection output all the way
The amplification factor of the first order variable gain amplifier of IF amplifier circuit processed；
Another way intermediate-freuqncy signal is converted into digital medium-frequency signal through analog-digital converter, and digital medium-frequency signal is through Digital Down Convert
Processing obtains the orthogonal digital baseband signal of two-way, carries out amplitude detection to digital baseband signal and digital baseband letter is calculated
Number amplitude, then controlled in IF amplifier circuit through the 2nd AGC voltage E2 of digital analog converter conversion output, the 2nd AGC voltage E2
The amplification factor of second level variable gain amplifier；Meanwhile detecting digital controlled oscillator in digital medium-frequency signal and Digital Down Convert
Phase difference fluctuation degree between output signal detects level S；
When rf modulated signal is decayed suddenly, the first AGC level E1 of intermediate-freuqncy signal detection output reduces, phase
Poor fluctuation degree detection level S generally also will increase, the first AGC level E1 less than pre-determined threshold level Ethd (E1 < Ethd) or
When phase difference fluctuation degree detects level S greater than pre-determined threshold phase difference fluctuation degree level Sthd (S > Sthd), the first analog switch
AS1 and the second analog switch AS2 switches to gain resetting voltage E0 simultaneously, and gain resetting voltage E0 controls first order variable gain
The amplification factor of amplifier and second level variable gain amplifier, so that the variable increasing of first order variable gain amplifier and the second level
The gain of beneficial amplifier reaches maximum value；In the case of remaining, first order variable gain amplifier is controlled using the first AGC level E1
Gain control end, the 2nd AGC level E2 control second level variable gain amplifier gain control end.
The present invention also provides a kind of suitable for being mutated the automatic of the AGC system of the superhet of channel
Gain control method, for controlling the gain of IF amplifier circuit；IF amplifier circuit include two-stage variable gain amplifier and
Thereafter cascade level-one fixed gain amplifier, two-stage variable gain amplifier are respectively first order variable gain amplifier and
Second level variable gain amplifier；Using the amplification factor of simulation AGC technical controlling first order variable gain amplifier, using number
The amplification factor of AGC technical controlling second level variable gain amplifier；
The gain control method of first order variable gain amplifier are as follows: the intermediate-freuqncy signal of IF amplifier circuit output is carried out
Simulate detection, the amplification factor of the first AGC level E1 control first order variable gain amplifier of detection output；
The gain control method of second level variable gain amplifier are as follows: be converted into IF amplifier circuit output intermediate-freuqncy signal
Digital medium-frequency signal carries out the orthogonal digital baseband signal of Digital Down Convert processing output two-way to digital medium-frequency signal, passes through
The amplitude of detection two-way digital orthogonal baseband signal obtains the amplitude of digital medium-frequency signal and through digital-to-analogue conversion at analog signal output the
Two AGC level E2 control the amplification factor of second level variable gain amplifier by the 2nd AGC level E2；Meanwhile detecting number
The phase difference fluctuation degree between sine wave signal that digital controlled oscillator generates in intermediate-freuqncy signal and Digital Down Convert detects level S；
When the first AGC level E1 is less than pre-determined threshold level Ethd or phase difference fluctuation degree detection level S greater than pre- gating
When limiting phase difference fluctuation degree level Sthd, the gain of first order variable gain amplifier and second level variable gain amplifier is controlled
Reach maximum；In the case of remaining, the gain control end of first order variable gain amplifier is controlled using the first AGC level E1, the
The gain control end of two AGC level E2 control second level variable gain amplifier.
Only express the embodiment of the invention above, the description thereof is more specific and detailed, but can not therefore and
It is interpreted as the limitation to patented invention-creation range.It should be pointed out that for those of ordinary skill in the art, not
Under the premise of being detached from the invention design, various modifications and improvements can be made, these belong to the guarantor of the invention
Protect range.Therefore, the scope of protection shall be subject to the appended claims for the invention patent.
Claims (5)
1. a kind of AGC system suitable for being mutated the superhet of channel, including it is radio frequency amplifying circuit, mixed
Frequency device, local oscillator, IF amplifier circuit, simulation agc circuit, digital AGC circit, the first decision device, the second decision device and
Or door；IF amplifier circuit includes two-stage variable gain amplifier and cascade level-one fixed gain amplifier thereafter, and two-stage can
Variable-gain amplifier is respectively first order variable gain amplifier and second level variable gain amplifier；It is characterized by:
The simulation agc circuit, including analog detector and the first analog switch AS1, IF amplifier circuit export intermediate-freuqncy signal
To analog detector, it is equal that analog detector detection exports the first AGC level E1, the first AGC level E1 and gain reset level E0
First the first control voltage V1 of analog switch AS1, the first analog switch AS1 output is input to first order variable gain amplifier
Gain control end；First analog switch AS1, for realizing the switching of the first AGC level E1 and gain reset level E0；
The digital AGC circit, including analog-digital converter, digital signal processor and digital analog converter；Analog-digital converter is used for
The intermediate-freuqncy signal that IF amplifier circuit exports is converted into digital medium-frequency signal；Digital signal processor includes Digital Down Convert
Device, range detector, digital phase-locked loop and phase difference fluctuation degree detector；
Digital down converter, including digital controlled oscillator, multiplier and filtering extraction module；Digital controlled oscillator is for generating two-way just
The sine wave signal of friendship, the orthogonal sine wave signal of two-way are input to two multipliers with digital medium-frequency signal respectively, and two multiply
The output of musical instruments used in a Buddhist or Taoist mass exports the orthogonal digital baseband signal of two-way through filtering extraction module respectively；
Range detector, for detecting the amplitude of two-way orthogonal digital baseband signal and exporting the amplitude of digital baseband signal to number
Mode converter, digital analog converter are equal through the 2nd AGC level E2, the 2nd AGC level E2 and gain reset level E0 of buffer output
Second the second control voltage V2 of analog switch AS2, the second analog switch AS2 output is input to second level variable gain amplifier
Gain control end；Second analog switch AS2, for realizing the switching of the 2nd AGC level E2 and gain reset level E0；
Digital phase-locked loop, including digital phase discriminator, digital loop filters and digital controlled oscillator；The orthogonal digital baseband letter of two-way
It number is input to digital phase discriminator, digital phase discriminator exports between digital medium-frequency signal and the sine wave signal of digital controlled oscillator output
Phase difference, digital phase discriminator output phase difference signal to phase difference fluctuation degree detector, phase difference fluctuation degree detector output
Phase difference fluctuation degree detects level S；
Meanwhile analog detector exports the first AGC level E1 to the first decision device, the first decision device is for judging the first AGC electricity
Whether flat E1 is less than pre-determined threshold level Ethd；Phase difference fluctuation degree detection level S is input to the second decision device, the second decision device
For judging whether phase difference fluctuation degree detection level S is greater than pre-determined threshold phase difference fluctuation degree level Sthd；First decision device
With the second decision device output decision signal to or door or door output gain reset signal to the first analog switch AS1 and the second mould
Quasi- switch AS2.
2. the AGC system of the superhet according to claim 1 for being suitable for being mutated channel, special
Sign is: radio frequency amplifying circuit includes sequentially connected first radio-frequency filter, radio frequency amplifier and the second radio-frequency filter.
3. the AGC system of the superhet according to claim 1 for being suitable for being mutated channel, special
Sign is: first order variable gain amplifier and second level variable gain amplifier are all made of to be made of dual-gate field-effect pipe
Amplifying circuit.
4. the AGC system of the superhet according to claim 1 for being suitable for being mutated channel, special
Sign is: range detector includes two digital detectors, for detecting the amplitude of two-way orthogonal digital baseband signal, digital base
The amplitude of band signal is that the quadratic sum of the amplitude of two-way orthogonal digital baseband signal is made even root again.
5. a kind of AGC system of the superhet described in claim 1 for being suitable for being mutated channel is automatic
Gain control method, for controlling the gain of IF amplifier circuit；IF amplifier circuit include two-stage variable gain amplifier and
Thereafter cascade level-one fixed gain amplifier, two-stage variable gain amplifier are respectively first order variable gain amplifier and
Second level variable gain amplifier；It is characterized by: using the times magnification of simulation AGC technical controlling first order variable gain amplifier
Number, using the amplification factor of digital AGC technical controlling second level variable gain amplifier；
The gain control method of first order variable gain amplifier are as follows: the intermediate-freuqncy signal of IF amplifier circuit output is simulated
Detection, the amplification factor of the first AGC level E1 control first order variable gain amplifier of detection output；
The gain control method of second level variable gain amplifier are as follows: IF amplifier circuit output intermediate-freuqncy signal is converted into number
Intermediate-freuqncy signal carries out the orthogonal digital baseband signal of Digital Down Convert processing output two-way to digital medium-frequency signal, passes through detection
The amplitude of two-way digital orthogonal baseband signal obtains the amplitude of digital medium-frequency signal and through digital-to-analogue conversion at the 2nd AGC of analog signal output
Level E2 controls the amplification factor of second level variable gain amplifier by the 2nd AGC level E2；Meanwhile detecting digital intermediate frequency
The phase difference fluctuation degree between sine wave signal that digital controlled oscillator generates in signal and Digital Down Convert detects level S；
When the first AGC level E1 is less than pre-determined threshold level Ethd or phase difference fluctuation degree detection level S greater than pre-determined threshold phase
When potential difference fluctuation degree level Sthd, the gain of control first order variable gain amplifier and second level variable gain amplifier reaches
It is maximum；In the case of remaining, using the gain control end of the first AGC level E1 control first order variable gain amplifier, the 2nd AGC
The gain control end of level E2 control second level variable gain amplifier.
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| CN201910338548.XA CN110011678B (en) | 2019-04-25 | 2019-04-25 | Automatic gain control system and method suitable for superheterodyne receiver of abrupt channel |
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| CN201910338548.XA CN110011678B (en) | 2019-04-25 | 2019-04-25 | Automatic gain control system and method suitable for superheterodyne receiver of abrupt channel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114337707A (en) * | 2021-12-20 | 2022-04-12 | 中国船舶重工集团公司第七二三研究所 | Harmonic/intermodulation signal judgment circuit and method of superheterodyne receiver |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5422601A (en) * | 1994-07-19 | 1995-06-06 | Analog Devices, Inc. | Hybrid analog digital automatic gain control gain recovery system |
| JP2004072644A (en) * | 2002-08-09 | 2004-03-04 | Sony Corp | Reception circuit and radio communication equipment using the same |
| KR20040055551A (en) * | 2002-12-21 | 2004-06-26 | 한국전자통신연구원 | Apparatus and Method for Controlling Automatic Gain in Wireless Telecommunication System |
| CN101895266A (en) * | 2010-07-20 | 2010-11-24 | 上海全波通信技术有限公司 | Mixed-signal automatic gain control system and control method thereof |
| CN202750081U (en) * | 2012-06-11 | 2013-02-20 | 桂林电子科技大学 | Software defined radio receiver comprising multi-level automatic gain control modules |
| CN107919881A (en) * | 2017-12-27 | 2018-04-17 | 中国人民解放军陆军工程大学 | A kind of automatic growth control receiver |
| CN209608637U (en) * | 2019-04-25 | 2019-11-08 | 南京信息职业技术学院 | A kind of AGC system suitable for being mutated the superhet of channel |
-
2019
- 2019-04-25 CN CN201910338548.XA patent/CN110011678B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5422601A (en) * | 1994-07-19 | 1995-06-06 | Analog Devices, Inc. | Hybrid analog digital automatic gain control gain recovery system |
| JP2004072644A (en) * | 2002-08-09 | 2004-03-04 | Sony Corp | Reception circuit and radio communication equipment using the same |
| KR20040055551A (en) * | 2002-12-21 | 2004-06-26 | 한국전자통신연구원 | Apparatus and Method for Controlling Automatic Gain in Wireless Telecommunication System |
| CN101895266A (en) * | 2010-07-20 | 2010-11-24 | 上海全波通信技术有限公司 | Mixed-signal automatic gain control system and control method thereof |
| CN202750081U (en) * | 2012-06-11 | 2013-02-20 | 桂林电子科技大学 | Software defined radio receiver comprising multi-level automatic gain control modules |
| CN107919881A (en) * | 2017-12-27 | 2018-04-17 | 中国人民解放军陆军工程大学 | A kind of automatic growth control receiver |
| CN209608637U (en) * | 2019-04-25 | 2019-11-08 | 南京信息职业技术学院 | A kind of AGC system suitable for being mutated the superhet of channel |
Non-Patent Citations (1)
| Title |
|---|
| 曹煜;唐小宏;李晨雨;: "基于数模混合技术的高中频快速AGC电路设计", 微电子学与计算机, no. 01 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337707A (en) * | 2021-12-20 | 2022-04-12 | 中国船舶重工集团公司第七二三研究所 | Harmonic/intermodulation signal judgment circuit and method of superheterodyne receiver |
| CN114337707B (en) * | 2021-12-20 | 2023-10-13 | 中国船舶重工集团公司第七二三研究所 | Harmonic/intermodulation signal judging circuit and method of superheterodyne receiver |
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