CN205249150U - Variable gain regulating circuit - Google Patents
Variable gain regulating circuit Download PDFInfo
- Publication number
- CN205249150U CN205249150U CN201521068513.2U CN201521068513U CN205249150U CN 205249150 U CN205249150 U CN 205249150U CN 201521068513 U CN201521068513 U CN 201521068513U CN 205249150 U CN205249150 U CN 205249150U
- Authority
- CN
- China
- Prior art keywords
- pin
- chip
- resistance
- amplification chip
- ground connection
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides a variable gain regulating circuit, include amplifier chip N1, conversion chip N2, operational amplifier N3 and power switching over chip N4, signal output part is after conversion chip N2 detection sampling, and is enlarged through operational amplifier N3, sends amplifier chip N1 to, realizes feedback loop, and amplifier chip N1 compares it with reference voltage for the inside variable gain circuit of control is adjusted and is enlargied the gain, thereby realizes the stability of output signal range. The utility model has the beneficial effect of simple structure, adopt the NULL ride gain to adjust, the governing speed is fast, and the output range is stable.
Description
Technical field
The utility model belongs to electronic circuit technology field, especially relates to a kind of variable gain regulating circuit.
Background technology
In a lot of communication equipments, in the time carrying out gain-adjusted, the general typical operation amplifier circuit that adopts carries out gain-adjusted,Typical operation amplifier principle is to carry out ride gain by fixed resistance, but typical operation amplifier circuit is in practical applicationMiddle gain is fixed, and can not meet the demand of automatic adjusting.
Utility model content
The purpose of this utility model is in order to overcome prior art deficiency, provides a kind of variable gain regulating circuit, structure letterSingle, be especially applicable to wide dynamic range, can amplifying stage low level signal and very big signal, adopt integrated chip ride gainRegulate, governing speed is fast, and output amplitude is stable.
The technical solution of the utility model is: a kind of variable gain regulating circuit, comprise amplification chip N1, conversion chip N2,Operational amplifier N3 and power conversion chip N4, the 1st pin contact resistance R3 one end of described amplification chip N1, resistanceThe R3 other end is connected gain output and is passed through capacitor C 4 ground connection by capacitor C 3 respectively with capacitor C 2, at described electric capacityBetween C3 and capacitor C 2, also connect the 2nd pin of conversion chip N2 by capacitor C 6, the 2nd pin of amplification chip N1Ground connection, the 4th pin ground connection of amplification chip N1, the 5th pin of amplification chip N1 connects gain input by resistance R 2End, the 8th pin of amplification chip N1 is connected with the 5th pin with capacitor C 1 by resistance R 1 respectively, amplification chip N1The 9th pin be connected with the 8th pin, the 10th pin of amplification chip N1 connects power supply-5V, the of amplification chip N111 pin concatenation operation amplifier N3 the 6th pins, the 12nd pin of amplification chip N1, by resistance R 8 ground connection, amplifiesThe 13rd pin of chip N1 connects power supply+5V, the 17th pin ground connection of amplification chip N1.
Further, the 6th pin of described amplification chip N1, the 7th pin, the 14th pin, the 15th pin and the 16thPin is unsettled.
Further, the 1st pin ground connection of described amplification chip N2, the 2nd pin of amplification chip N2 connects by resistance R 4Ground, the 4th pin of amplification chip N2 connects power supply-5V, and the 5th pin of amplification chip N2 passes through capacitor C 5 ground connection,The 6th pin of amplification chip N2 is by the 2nd pin of resistance R 5 concatenation operation amplifier N3, the 7th of amplification chip N2Pin connects power supply+5V, the 7th pin ground connection of amplification chip N2.
Further, the 2nd pin of described operational amplifier N3 is connected the 6th pin, computing with capacitor C 7 by resistance R 6The 3rd pin of amplifier N3 is by the 4th pin ground connection of resistance R 9 ground connection operational amplifier N3, operational amplifier N3The 6th pin connect the 2nd pin by capacitor C 8.
Further, the 1st pin ground connection of described power conversion chip N4, the 2nd pin of power conversion chip N4 is respectivelyBe connected with resistance R 8 by resistance R 7 with resistance R 10 and be connected with resistance R 9, the 3rd pin of power conversion chip N4 dividesBe not connected electric capacity other end C9 ground connection with power supply+5V and capacitor C 9 one end.
Advantage and the good effect that the utlity model has are: owing to adopting technique scheme, gain unit is one and consolidatesDetermine gain operational amplifier, operational amplifier gain remains unchanged, and therefore can within the scope of wider condition of work, optimize permanentDetermine bandwidth, distortion and overload performance, for concrete application brings benifit, be especially applicable to wide dynamic range, can amplifying stage lowLevel signal and greatly signal, gain ranging reaches 60dB; In whole working range, carry out low distortion amplification; Can regulateMinimum and maximum gain limit.
Brief description of the drawings
Fig. 1 is circuit connection structure schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is elaborated.
As shown in circuit connection structure schematic diagram as of the present utility model in Fig. 1, the utility model provides a kind of variable gain to regulateCircuit, comprises amplification chip N1, conversion chip N2, operational amplifier N3 and power conversion chip N4, described amplification coreThe 1st pin contact resistance R3 one end of sheet N1, resistance R 3 other ends are connected gain by capacitor C 3 with capacitor C 2 respectivelyOutput and by capacitor C 4 ground connection also connects conversion chip by capacitor C 6 between described capacitor C 3 and capacitor C 2The 2nd pin of N2, the 2nd pin ground connection of amplification chip N1, the 4th pin ground connection of amplification chip N1, amplification chipThe 5th pin of N1 connects gain input by resistance R 2, and the 8th pin of amplification chip N1 is respectively by resistance R 1Be connected with the 5th pin with capacitor C 1, the 9th pin of amplification chip N1 is connected with the 8th pin, of amplification chip N110 pins connect power supply-5V, the 11st pin concatenation operation amplifier N3 the 6th pin of amplification chip N1, amplification chipThe 12nd pin of N1 is by resistance R 8 ground connection, and the 13rd pin of amplification chip N1 connects power supply+5V, amplification chip N1The 17th pin ground connection. The 6th pin of described amplification chip N1, the 7th pin, the 14th pin, the 15th pin andThe 16th pin is unsettled.
The 1st pin ground connection of described amplification chip N2, the 2nd pin of amplification chip N2, by resistance R 4 ground connection, amplifiesThe 4th pin of chip N2 connects power supply-5V, and the 5th pin of amplification chip N2 is by capacitor C 5 ground connection, amplification chipThe 6th pin of N2 is by the 2nd pin of resistance R 5 concatenation operation amplifier N3, and the 7th pin of amplification chip N2 connectsPower supply+5V, the 7th pin ground connection of amplification chip N2.
The 2nd pin of described operational amplifier N3 is connected the 6th pin, operational amplifier N3 with capacitor C 7 by resistance R 6The 3rd pin by the 4th pin ground connection of resistance R 9 ground connection operational amplifier N3, the 6th pin of operational amplifier N3Connect the 2nd pin by capacitor C 8.
The 1st pin ground connection of described power conversion chip N4, the 2nd pin of power conversion chip N4 passes through respectively resistanceR7 be connected with resistance R 8 and resistance R 10 be connected with resistance R 9, the 3rd pin of power conversion chip N4 respectively with power supply+5VBe connected electric capacity other end C9 ground connection with capacitor C 9 one end.
The course of work of this example: the variable gain regulating circuit that the utility model provides, amplification chip N1 adopts model to beAD8336 chip, AD8336 chip is a broadband variable gain amplification chip, internal gain adjustable range reaches-14～+ 46dB; Small signal bandwidth can reach 115MHz, and large-signal (2Vp-p) bandwidth reaches 80MHz; Low noise, voltage noise30nV/ √ Hz, current noise 3pA/ √ Hz; Chip internal comprises a preamplifier, the variable increasing of one-60dB～0dBBenefit circuit, a 34dB fixed gain amplifier, voltage offset electric circuit and gain control interface. In the design,This chip is core, and the signal feeding back and normal voltage are compared, and realizes gain-adjusted.
It is AD736 chip that conversion chip N2 adopts model, and AD736 chip is the conversion chip that a root mean square turns direct current,Function is to detect AC signal, and RMS (root-mean-square value) is converted to DC signal output, offers and puts as feedback signalLarge chip N1.
It is AD8551 chip that operational amplifier N3 adopts model, and AD8551 chip is rail-to-rail operational amplifier, will changeThe feedback signal of chip N2 output is amplified, and offers amplification chip N1 as gain control signal.
Power conversion chip N4 is power conversion chip, input+5V, and output 1.5V, for providing reference power supply.
Signal output part, after conversion chip N2 detects sampling, amplifies through operational amplifier N3, sends amplification chip N1 to,Realize feedback control loop, amplification chip N1, by itself and reference voltage comparison, for controlling inner variable gain circuit, regulatesGain amplifier, thus realize the stable of amplitude output signal.
Above an embodiment of the present utility model is had been described in detail, but described content is only of the present utility modelGood embodiment, can not be considered to for limiting practical range of the present utility model. Allly do according to the utility model application rangeEqualization change with improve etc., within all should still belonging to patent covering scope of the present utility model.
Claims (5)
1. a variable gain regulating circuit, is characterized in that: comprise that amplification chip N1, conversion chip N2, computing putLarge device N3 and power conversion chip N4, the 1st pin contact resistance R3 one end of described amplification chip N1, resistance R 3 is anotherOne end is connected gain output and is passed through capacitor C 4 ground connection by capacitor C 3 respectively with capacitor C 2, described capacitor C 3 HesBetween capacitor C 2, also connect the 2nd pin of conversion chip N2 by capacitor C 6, the 2nd pin ground connection of amplification chip N1,The 4th pin ground connection of amplification chip N1, the 5th pin of amplification chip N1 connects gain input by resistance R 2, putsThe 8th pin of large chip N1 is connected with the 5th pin with capacitor C 1 by resistance R 1 respectively, the 9th of amplification chip N1Pin is connected with the 8th pin, and the 10th pin of amplification chip N1 connects power supply-5V, the 11st pin of amplification chip N1Concatenation operation amplifier N3 the 6th pin, the 12nd pin of amplification chip N1 is by resistance R 8 ground connection, amplification chip N1The 13rd pin connect power supply+5V, the 17th pin ground connection of amplification chip N1.
2. variable gain regulating circuit according to claim 1, is characterized in that: the 6th of described amplification chip N1Pin, the 7th pin, the 14th pin, the 15th pin and the 16th pin are unsettled.
3. variable gain regulating circuit according to claim 1, is characterized in that: the 1st of described amplification chip N2Pin ground connection, the 2nd pin of amplification chip N2 is by resistance R 4 ground connection, and the 4th pin of amplification chip N2 connects power supply-5V, the 5th pin of amplification chip N2 is by capacitor C 5 ground connection, and the 6th pin of amplification chip N2 connects by resistance R 5Connect the 2nd pin of operational amplifier N3, the 7th pin of amplification chip N2 connects power supply+5V, the 7th of amplification chip N2Pin ground connection.
4. variable gain regulating circuit according to claim 1, is characterized in that: described operational amplifier N3'sThe 2nd pin is connected the 6th pin with capacitor C 7 by resistance R 6, the 3rd pin of operational amplifier N3 is by resistance R 9The 4th pin ground connection of ground connection operational amplifier N3, the 6th pin of operational amplifier N3 connects the 2nd by capacitor C 8 and drawsPin.
5. variable gain regulating circuit according to claim 1, is characterized in that: described power conversion chip N4The 1st pin ground connection, the 2nd pin of power conversion chip N4 is connected with resistance R 8 and resistance R 10 by resistance R 7 respectivelyBe connected with resistance R 9, the 3rd pin of power conversion chip N4 is connected with power supply+5V and capacitor C 9 one end respectively, electric capacityOther end C9 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521068513.2U CN205249150U (en) | 2015-12-18 | 2015-12-18 | Variable gain regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521068513.2U CN205249150U (en) | 2015-12-18 | 2015-12-18 | Variable gain regulating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205249150U true CN205249150U (en) | 2016-05-18 |
Family
ID=55948219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521068513.2U Active CN205249150U (en) | 2015-12-18 | 2015-12-18 | Variable gain regulating circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205249150U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312185A (en) * | 2018-03-20 | 2019-10-08 | 内蒙古自治区科学技术信息研究院 | One kind being based on embedded low noise phonon pickup |
-
2015
- 2015-12-18 CN CN201521068513.2U patent/CN205249150U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312185A (en) * | 2018-03-20 | 2019-10-08 | 内蒙古自治区科学技术信息研究院 | One kind being based on embedded low noise phonon pickup |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202183059U (en) | Low-dropout linear voltage regulator | |
| CN103066934A (en) | Variable-gain operational amplifier for infrared receiver | |
| CN201674469U (en) | Audio-frequency power amplifier circuit with automatic gain control circuit | |
| CN104333239A (en) | High-efficiency totally-integrated AC-DC converter | |
| CN205249150U (en) | Variable gain regulating circuit | |
| CN103592989A (en) | Low quiescent dissipation rapid transient response non-output capacitance LDO (low drop out regulator) circuit | |
| CN201374018Y (en) | Linear stabilized voltage power supply | |
| CN201332359Y (en) | Output voltage compensating device | |
| CN203422416U (en) | High-end current detection circuit | |
| CN201828595U (en) | DC voltage signal isolating amplifier circuit | |
| CN103338015A (en) | Amplifier for increasing gain and design method of amplifier | |
| CN203397252U (en) | High-performance linear low-dropout voltage stabilizing circuit | |
| CN107168438A (en) | A kind of multistage gain amplification low voltage difference source of stable pressure of belt current negative-feedback | |
| CN203965986U (en) | A kind of numerical control adjustable D. C regulated | |
| CN202794317U (en) | Zero cross detection circuit structure | |
| CN205986792U (en) | Variable gain amplifier circuit with high stable gain control | |
| CN205334278U (en) | Linear voltage regulator with voltage pre -stabilizing circuit | |
| CN201303314Y (en) | Efficiency adjusting device of AB type LDMOS linear power amplifier | |
| CN204331533U (en) | A kind of low-dropout linear voltage-regulating circuit | |
| CN204886882U (en) | Preamplifier | |
| CN203857978U (en) | Novel low noise wave detector circuit | |
| CN206575384U (en) | A kind of automatic gain control circuit and audio frequency apparatus | |
| CN203504501U (en) | Broadband low-noise amplifier | |
| CN106788304A (en) | A kind of automatic gain control circuit and audio frequency apparatus | |
| CN102820861A (en) | Power-saving enhanced slew rate system of operational amplifier output stage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |