CN106656084A - Automatic level control loop - Google Patents
Automatic level control loop Download PDFInfo
- Publication number
- CN106656084A CN106656084A CN201611238521.6A CN201611238521A CN106656084A CN 106656084 A CN106656084 A CN 106656084A CN 201611238521 A CN201611238521 A CN 201611238521A CN 106656084 A CN106656084 A CN 106656084A
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- power amplifier
- level control
- controlled attenuator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/10—Gain control characterised by the type of controlled element
- H03G2201/106—Gain control characterised by the type of controlled element being attenuating element
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/70—Gain control characterized by the gain control parameter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/70—Gain control characterized by the gain control parameter
- H03G2201/708—Gain control characterized by the gain control parameter being temperature
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses an automatic level control loop. The automatic level control loop comprises a voltage controlled attenuator, a filter circuit, a power amplifier, an operational amplifier differential circuit, a wave detecting circuit, a coupling circuit and a reference voltage source circuit; and the voltage controlled attenuator is respectively connected to an input signal Vi, the filter circuit and the power amplifier. According to the automatic level control loop disclosed by the invention, the input signal Vi first enters the voltage controlled attenuator and then enters the power amplifier to carry out amplification on the signal, the coupling circuit at an output end of the power amplifier couples a signal f, the wave detecting circuit generates a wave detecting voltage according to the coupled signal f, and the differential amplification is carried out on the wave detecting voltage and on a voltage of the reference voltage source circuit to output a primary feedback control voltage for feedback control on the voltage controlled attenuator via the filter circuit, thereby forming a complete negative feedback loop and finally enabling an output power to keep constant. Programmable controllers such as single chip microcomputer or DSP and the like are not adopted, the development period and the difficulty are reduced, the cost is low, and the market competitiveness is strong.
Description
Technical field
The present invention relates to a kind of level control circuit, specifically a kind of auto level control loop.
Background technology
The control of automatic electric-level loop belongs to one kind of feedback control circuit, its effect be when input signal is changed greatly,
The output of power amplifier is held essentially constant, specifically, i.e., when input signals are small, auto level control loop
Do not work, and work as after input signal become greater to a certain degree, auto level control loop starts effect, and according to input signal
Size dynamic adjustment power amplifier gain, make output keep it is constant.
Existing many auto level control loops are all controlled using DSP or single-chip microcomputer, relatively costly, Er Qieyou
In needing to be programmed design, the construction cycle is longer, and for this problem, the present invention proposes a kind of circuit system succinctly and cost
Relatively low auto level control loop.
The content of the invention
It is an object of the invention to provide a kind of auto level control loop, to solve above-mentioned background technology in propose ask
Topic.
For achieving the above object, the present invention provides following technical scheme：
A kind of auto level control loop, including voltage-controlled attenuator, filter circuit, power amplifier, amplifier difference channel,
Detecting circuit, termination power and reference voltage source circuit, it is characterised in that the termination power be also respectively connected with detecting circuit and
Output end vo, detecting circuit is also connected with amplifier difference channel, and amplifier difference channel is also respectively connected with the filter circuit other end and base
Reference voltage source circuit；The voltage-controlled attenuator adopts attenuator HMC346；The detecting circuit is by the way of coupled microstrip line
Carry out detection.
As further scheme of the invention：The voltage-controlled attenuator connects respectively input signal Vi, filter circuit and work(
Rate amplifier, power amplifier is also connected with termination power.
Compared with prior art, the invention has the beneficial effects as follows：Input signal Vi of auto level control loop of the present invention
Voltage-controlled attenuator is initially entered, signal is amplified subsequently into power amplifier, the coupling electricity of power amplifier output
Road is coupled out signal f, and detecting circuit produces a detecting circuit, detecting circuit and reference voltage source according to the signal f being coupled out
The voltage of circuit carries out differential amplification and exports preliminary feedback control voltage, feedback control voltage-controlled attenuator after filtered circuit,
So as to form complete feedback loop, output is finally set to keep constant, it is not programmable using single-chip microcomputer or DSP etc.
Controller reduces construction cycle and difficulty, and low cost, the market competitiveness is strong.
Description of the drawings
Fig. 1 is the circuit diagram of auto level control loop.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is referred to, in the embodiment of the present invention, a kind of auto level control loop, including voltage-controlled attenuator, filtered electrical
Road, power amplifier, amplifier difference channel, detecting circuit, termination power and reference voltage source circuit, the voltage-controlled attenuator point
Not Lian Jie input signal Vi, filter circuit and power amplifier, power amplifier is also connected with termination power, and termination power is also distinguished
Connection detecting circuit and output end vo, detecting circuit is also connected with amplifier difference channel, and amplifier difference channel is also respectively connected with filtering
The circuit other end and reference voltage source circuit；The voltage-controlled attenuator adopts attenuator HMC346；The detecting circuit adopts coupling
Closing the mode of microstrip line carries out detection.
Fig. 1 is referred to, input signal Vi initially enters voltage-controlled attenuator, and signal is put subsequently into power amplifier
Greatly, the termination power of power amplifier output is coupled out signal f, and detecting circuit produces an inspection according to the signal f being coupled out
Wave voltage, detecting circuit carries out differential amplification and exports preliminary feedback control voltage, Jing filters with the voltage of reference voltage source circuit
Feedback control voltage-controlled attenuator after wave circuit, so as to form complete feedback loop, finally makes output keep constant.Such as
Power amplifier due to when temperature or other reasonses gain rising, output become big, the signal increase that termination power is coupled out,
Increase detecting circuit, detecting circuit produces the voltage-controlled decay of control Jing after amplifier differential amplification with the voltage of reference voltage source circuit
The voltage of device, the voltage increases voltage-controlled attenuator attenuation, so that whole power amplifier gain is reduced, power amplifier
Output reduces, and forms dynamic equilibrium, makes amplifier output power tend to constant；Conversely, as power amplifier due to temperature or
Other reasonses gain reduction, output become hour, and the signal that termination power is coupled out reduces so that detecting circuit reduces, inspection
Wave voltage produces the voltage of control voltage-controlled attenuator with reference voltage source voltage after amplifier differential amplification, and the voltage makes voltage-controlled
Attenuator attenuation reduces, and also raises whole power amplifier gain, so that power amplifier output increase, ultimately forms
Dynamic equilibrium, makes amplifier output tend to constant.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of spirit or essential attributes without departing substantially from the present invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as and limit involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of description is only that for clarity those skilled in the art should
Using description as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art
Understandable other embodiment.
Claims (2)
1. a kind of auto level control loop, including voltage-controlled attenuator, filter circuit, power amplifier, amplifier difference channel, inspection
Wave circuit, termination power and reference voltage source circuit, it is characterised in that the termination power is also respectively connected with detecting circuit and defeated
Go out and hold Vo, detecting circuit is also connected with amplifier difference channel, amplifier difference channel is also respectively connected with the filter circuit other end and benchmark
Voltage source circuit；The voltage-controlled attenuator adopts attenuator HMC346；The detecting circuit is entered by the way of coupled microstrip line
Row detection.
2. auto level control loop according to claim 1, it is characterised in that the voltage-controlled attenuator connects respectively defeated
Enter signal Vi, filter circuit and power amplifier, power amplifier is also connected with termination power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238521.6A CN106656084A (en) | 2016-12-28 | 2016-12-28 | Automatic level control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238521.6A CN106656084A (en) | 2016-12-28 | 2016-12-28 | Automatic level control loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106656084A true CN106656084A (en) | 2017-05-10 |
Family
ID=58835283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611238521.6A Pending CN106656084A (en) | 2016-12-28 | 2016-12-28 | Automatic level control loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106656084A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181601A (en) * | 2019-11-22 | 2020-05-19 | 北京麦克斯韦科技有限公司 | Control system of quick response automatic level control loop |
| CN112187201A (en) * | 2020-10-22 | 2021-01-05 | 上海航天电子通讯设备研究所 | Temperature compensation gain closed-loop circuit of satellite-borne gallium nitride solid-state power amplifier |
| CN112532256A (en) * | 2020-10-30 | 2021-03-19 | 南京航空航天大学 | Automatic gain control circuit of transmitting terminal with bidirectional configurable gain |
-
2016
- 2016-12-28 CN CN201611238521.6A patent/CN106656084A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181601A (en) * | 2019-11-22 | 2020-05-19 | 北京麦克斯韦科技有限公司 | Control system of quick response automatic level control loop |
| CN112187201A (en) * | 2020-10-22 | 2021-01-05 | 上海航天电子通讯设备研究所 | Temperature compensation gain closed-loop circuit of satellite-borne gallium nitride solid-state power amplifier |
| CN112532256A (en) * | 2020-10-30 | 2021-03-19 | 南京航空航天大学 | Automatic gain control circuit of transmitting terminal with bidirectional configurable gain |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170510 |