CN106571786B - A kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit - Google Patents
A kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit Download PDFInfo
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- CN106571786B CN106571786B CN201610987638.8A CN201610987638A CN106571786B CN 106571786 B CN106571786 B CN 106571786B CN 201610987638 A CN201610987638 A CN 201610987638A CN 106571786 B CN106571786 B CN 106571786B
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- input
- signal
- variable gain
- output
- gain amplifier
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
Abstract
The invention belongs to wireless communication fields, a kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit is specifically provided, it include: input wideband balun, output wideband balun, linear power supply and 2 symmetrical signal links, radio-frequency input signals is coupled as the balanced signal that two-way phase difference is 180 ° by inputting wideband balun, 2 bars links are inputted respectively, and the output signal of 2 bars links is coupled as one-channel signal output by exporting balun；In every bars link, input signal successively passes through the first input broadband impedance transformer, the first variable gain amplifier, the second input broadband impedance transformer and the second variable gain amplifier.The present invention uses improved balanced structure and cascade system, reasonably utilizes signal phase and amplitude cancellation, and second order and three ranks for effectively raising automatic gain control circuit are linear.
Description
Technical field
The invention belongs to wireless communication fields, and in particular to a kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit.
Background technique
With the rapid development of the industries such as microelectric technique, computer networking technology and the communication technology, automatic growth control
Circuit is increasingly known and is widely applied in every field.Automatic growth control route, abbreviation AGC line
Road, A are AUTO (automatic), and G is GAIN (gain), and C is CONTROL (control)；It is one kind of output violent change device, is to utilize
Linear Amplifer and the efficient combination of compression amplification are adjusted output signal.When input signal is weaker, linear amplifier circuit
Work guarantees the intensity of output acoustical signal；When input signal strength reaches a certain level, starting compression amplifying circuit makes sound
Output amplitude reduces, and meets the needs decayed to input signal；That is, AGC function can be inputted by changing
The amplitude that compression factor automatically controls gain is exported, expands the range of receiving of receiver, it can become in input signal amplitude
Change it is very big in the case where, so that amplitude output signal is kept constant or is only changed in smaller range, be unlikely to because of input signal
It is too small and can not work normally, also it is unlikely to make receiver that saturation or blocking occur because input signal is too big.It is set in circuit
In meter, this route is largely used, from the Radar Technology at tip to daily radio data system, automatic growth control without
Doubt signal strength problem present in the various technologies of very good solution.Currently, realize that the means of automatic growth control have very much,
But second order and third-order non-linear interference due to automatic gain control circuit, cause its linear excessively poor；For this problem, of the invention
A kind of purpose for being realized automatic growth control using amplifier, that is, automatic gain control amplifier are provided.
Summary of the invention
It is automatic to overcome the purpose of the present invention is to provide a kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit
Because its second order and third-order non-linear interference lead to linearly excessively poor problem, the present invention is amplified gain control circuit using variable gain
Device (VGA) builds balanced structure and realizes automatic growth control, effectively inhibits the second order of automatic gain control circuit and three ranks non-thread
Property interference, improve the linearity.
To achieve the above object, the technical solution of the present invention is as follows:
A kind of broadband double flat weighs Larger Dynamic automatic gain control circuit, comprising: input wideband balun, output wideband balun,
Linear power supply and 2 symmetrical signal links, wherein every bars chain routes 2 input broadband impedance transformers, 2 pincers
Bit transistor and 2 variable gain amplifiers are constituted, and radio-frequency input signals is coupled as two-way phase difference by inputting wideband balun
For 180 ° of balanced signal, 2 bars links are inputted respectively, and the output signal of 2 bars links is coupled as by exporting balun
One-channel signal output；It is characterized in that, input signal successively passes through the transformation of the first input broadband impedance in every bars link
Device, the first variable gain amplifier, the second input broadband impedance transformer and the second variable gain amplifier, described second is variable
Gain amplifier output controls the feedback end of Voltage Feedback to the first variable gain amplifier and the second variable gain amplifier；Institute
Clamp transistor is stated for adjusting the control voltage, guarantees that the first variable gain amplifier and the second variable gain amplifier are steady
Fixed work；The linear power supply provides operating voltage for each variable gain amplifier.
Inputted in the every bars link of the present invention using 2 input broadband impedance transformers completion variable gain amplifiers,
The impedance matching of output end, the problems such as avoiding loss and the larger standing wave that impedance mismatch is introduced；Two bars links are complete
Symmetrically, balanced structure is built by input wideband balun, output wideband balun, realizes that signal phase ratio is matched, effectively inhibit automatic
The second order and third-order non-linear of gain control circuit interfere, and improve the linearity.
Detailed description of the invention
Fig. 1 is superhet theory structure schematic diagram.
Fig. 2 is broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit theory structure block diagram of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
The present embodiment provides a kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit, theory structure block diagram such as Fig. 2
It is shown；It include: input wideband balun, output wideband balun, linear power supply and 2 symmetrical signal links, wherein every letter
Number chain routes 2 input broadband impedance transformers, 2 clamp transistors and 2 variable gain amplifiers and constitutes, and radio frequency input is believed
Number it is 180 ° of balanced signal by inputting wideband balun to be coupled as two-way phase difference, inputs 2 bars links, 2 letters respectively
The output signal of number link is coupled as one-channel signal output by exporting balun；It is characterized in that, in every bars link, input
Signal successively passes through the first input broadband impedance transformer, the first variable gain amplifier, the second input broadband impedance transformer
And second variable gain amplifier, the second variable gain amplifier output control Voltage Feedback to first variable gain are amplified
The feedback end of device and the second variable gain amplifier；The clamp transistor guarantees that first can for adjusting the control voltage
Variable-gain amplifier and the second variable gain amplifier steady operation；The linear power supply provides for each variable gain amplifier
Operating voltage.
Wherein, the input, output wideband balun are made using magnetic core and twisted pair, and small volume is applicable in frequency
Band is wider, and can bear biggish electric current；Its magnetic core uses manganese-zinc ferrite.
4 inputs broadband impedance transformer is converted for realizing prevention at radio-frequency port impedance, is reduced because of impedance not
The problems such as matching introduced loss and larger standing wave.It is all made of TC4-1W in the present embodiment, 50 ohmages are transformed into 200
It is input to variable gain amplifier again after ohm.
The variable gain amplifier is all made of AD8367, and full gain is 45dB, and two-stage AD8367 cascade can expand
The dynamic range of gain adjustment；But traditional mode is that two-stage AD8367 uses the feedback voltage of oneself to adjust gain, is to work as
The problem of when input signal is smaller, first order AD8367 understands full gain, and second level AD8367 gain is smaller, does so is first
Will cause the decline of performance when grade full gain, influence signal quality, and be possible to lock it is indefinite；And the second level is used in the present invention
The feedback control voltage of AD8367 controls the gain of the first order and second level AD8367, because level is consistent, gain simultaneously
It can be evenly distributed to two-stage AD8367, so as to improve performance.
The effect of the clamp transistor is that the feedback control voltage of variable gain amplifier is limited in 5V or so, is adopted
It is realized with 2N2907；Its collector connects feedback control voltage, and emitter connects 5V level, when the feedback control voltage of AD8367 is more than
When 5V, transistor turns limit feedback control voltage.
After radiofrequency signal input, first passing through input wideband balun becomes the signal of 180 ° of two phase phase differences, defeated respectively
Enter two links up and down, become from 50 ohm of impedance 200 ohm of impedance using input broadband impedance transformer, it is laggard
Enter AD8367, becomes from 50 ohm of impedance using broadband impedance transformer 200 ohm of impedance after output, into second
AD8367, two paths of signals is combined into all the way after output.
Totally 4 amplifiers are identical amplifier to upper and lower two branches.Upper and lower branch transfer function are as follows:As signal RFin=A cos ω1t+A cosω2T passes through as input signal
When balance amplifier, signal respectively enters two branches up and down by impedance transformation.
Then input signal in upper branch are as follows:
Input signal in lower branch are as follows:
Upper branch output signal second order intermodulation distortion and third order intermodulation distortion signal are as follows:
Second order components:
Third order products:
Lower branch output signal second order intermodulation distortion and third order intermodulation distortion signal are as follows:
Second order components:
Third order products:
The upper and lower reversed 180 ° of synthesis gained signal of two branch output signals is the output of system, it is known that two in output signal
Rank intermodulation distortion components are as follows:
Third order intermodulation distortion component in output signal are as follows:
There is above-mentioned analysis it is found that without second order inter-modulation component, three rank signal electricity of output in this structure output signal theory
Pressure is a quarter of traditional structure, i.e. the three rank linearities improve 3dB.
Therefore, the present invention utilizes improved balanced structure and cascade system, reasonably utilizes signal phase and amplitude cancellation,
Second order and three ranks for effectively raising AGC system are linear.The cascade system of improvement, mean allocation are utilized simultaneously
Gain per stage solves the problems, such as performance decline even losing lock when variable gain amplifier cascade.To sum up, proposed by the invention
A kind of broadband double flat weigh Larger Dynamic AGC system, have performance more higher than other AGC systems and
Better second order, the three rank linearities.
Basic principles and main features and advantage of the invention have been shown and described in the above content.The technical staff of the industry
It should be appreciated that the present invention is not limited to the above embodiments, the above embodiments and description only describe the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these variation and
Improvement all fall within the protetion scope of the claimed invention.Any feature disclosed in this specification, unless specifically stated,
It is replaced by other equivalent or with similar purpose alternative features；Disclosed all features or all methods or process
In step can be combined in any way other than mutually exclusive feature and/or step.
Claims (1)
- The Larger Dynamic automatic gain control circuit 1. a kind of broadband double flat weighs, comprising: input wideband balun, output wideband balun, line Property power supply and 2 symmetrical signal links, wherein every bars chain routes 2 input broadband impedance transformers, 2 clampers Transistor and 2 variable gain amplifiers are constituted, and radio-frequency input signals is coupled as two-way phase difference by input wideband balun and is 180 ° of balanced signal, inputs 2 bars links respectively, and the output signal of 2 bars links is coupled as list by exporting balun The output of road signal；It is characterized in that, in every bars link, input signal successively pass through the first input broadband impedance transformer, First variable gain amplifier, the second input broadband impedance transformer and the second variable gain amplifier, the described second variable increasing Beneficial amplifier output control Voltage Feedback to the first variable gain amplifier feedback end and the second variable gain amplifier it is anti- Present end；The clamp transistor guarantees the first variable gain amplifier and the second variable gain for adjusting the control voltage Amplifier stability work；The linear power supply provides operating voltage for each variable gain amplifier.
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| CN201610987638.8A CN106571786B (en) | 2016-11-10 | 2016-11-10 | A kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit |
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| CN201610987638.8A CN106571786B (en) | 2016-11-10 | 2016-11-10 | A kind of broadband double flat weighing apparatus Larger Dynamic automatic gain control circuit |
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| CN106571786A CN106571786A (en) | 2017-04-19 |
| CN106571786B true CN106571786B (en) | 2019-08-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108123693B (en) * | 2017-12-20 | 2021-06-15 | 湖南智领通信科技有限公司 | Automatic control method for improving efficiency of radio frequency power amplifier |
| CN108566166B (en) * | 2018-02-09 | 2022-03-11 | 中国科学院国家天文台 | Low-power consumption ultra-wideband low-noise amplifier |
| CN110166005B (en) * | 2019-06-12 | 2021-10-08 | 中国科学院武汉物理与数学研究所 | Symmetrical low-noise isolation distribution amplifying circuit |
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| CN105763207A (en) * | 2014-12-17 | 2016-07-13 | 成都创客之家科技有限公司 | Broadband radio frequency transmitting circuit in radio frequency measurement instrument |
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| US20140312976A1 (en) * | 2011-04-20 | 2014-10-23 | Freescale Semiconductor, Inc. | Amplfiers and related integrated circuits |
| CN202978825U (en) * | 2012-11-22 | 2013-06-05 | 成都九洲迪飞科技有限责任公司 | Broadband two-path balanced low-noise amplifier |
| CN203278749U (en) * | 2013-05-03 | 2013-11-06 | 安徽四创电子股份有限公司 | Low noise amplifier with automatic level control circuit |
| CN103986419A (en) * | 2014-05-15 | 2014-08-13 | 电子科技大学 | Short-wave broadband double balanced mixer |
| CN104579178A (en) * | 2015-01-19 | 2015-04-29 | 东南大学 | Broadband input matching based improved doherty power amplifier |
| CN105932970A (en) * | 2016-04-18 | 2016-09-07 | 北京邮电大学 | Envelope tracked Doherty power amplifier |
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