CN104796103A - Gain-variable noninverting amplifier device - Google Patents
Gain-variable noninverting amplifier device Download PDFInfo
- Publication number
- CN104796103A CN104796103A CN201510140429.5A CN201510140429A CN104796103A CN 104796103 A CN104796103 A CN 104796103A CN 201510140429 A CN201510140429 A CN 201510140429A CN 104796103 A CN104796103 A CN 104796103A
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- amplifier device
- gain
- variable
- digital potentiometer
- 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
Abstract
The invention discloses a gain-variable noninverting amplifier device. The gain-variable noninverting amplifier device comprises an operational amplifier, a digital potentiometer and a resistor. The operational amplifier comprises a voltage input end, a ground input end and a voltage output end. The ground input end is connected with the ground through the resistor. The digital potentiometer is connected with the ground input end and the voltage output end of the operational amplifier in parallel and comprises a digital signal interface. According to the gain-variable noninverting amplifier device, amplifying with different gains is controlled through the SPI compatible serial digital interface; a circuit has the characteristics of the high accuracy, the low noise and the low total harmonic distortion.
Description
Technical field
The present invention relates to a kind of variable gain in-phase amplifier device, belong to circuit engineering field.
Background technology
At present, in existing amplifier circuit, how to provide a kind of low gain error, and the amplifier of many variable gains is circuit more crucial in instrument conditioning application.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of variable gain in-phase amplifier device.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of variable gain in-phase amplifier device, comprise operational amplifier, digital potentiometer, resistance, described operational amplifier comprises voltage input end, ground connection input, voltage output end, and described ground connection input is connected with Earth Phase by resistance; The ground connection input of described digital potentiometer and operational amplifier and voltage output end are in parallel; Described digital potentiometer comprises digital signal interface.
Also comprise filter capacitor, the ground connection input of described filter capacitor and operational amplifier and voltage output end are in parallel.
Preferably, described operational amplifier adopts OP184.
Preferably, described digital potentiometer adopts AD5292.
Preferably, the capacitance of described filter capacitor is set to 10PF.
Beneficial effect: a kind of variable gain in-phase amplifier device provided by the invention, controls different gains by SPI compatible type serial digital interface and amplifies; This circuit has the characteristic of high accuracy, low noise and low total harmonic distortion.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of variable gain in-phase amplifier device, comprise operational amplifier 1, digital potentiometer 2, resistance 3, described operational amplifier 1 comprises voltage input end 11, ground connection input 12, voltage output end 13, and described ground connection input 12 is connected with Earth Phase by resistance 3; Ground connection input 12 and the voltage output end 13 of described digital potentiometer 2 and operational amplifier 1 are in parallel; Described digital potentiometer 2 comprises digital signal interface 21.
Also comprise filter capacitor 4, ground connection input 12 and the voltage output end 13 of described filter capacitor 4 and operational amplifier 1 are in parallel.
Preferably, described operational amplifier 1 adopts OP184.
Preferably, described digital potentiometer 2 adopts AD5292.
Preferably, the capacitance of described filter capacitor 4 is set to 10PF.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a variable gain in-phase amplifier device, comprise operational amplifier, digital potentiometer, resistance, it is characterized in that: described operational amplifier comprises voltage input end, ground connection input, voltage output end, described ground connection input is connected with Earth Phase by resistance; The ground connection input of described digital potentiometer and operational amplifier and voltage output end are in parallel; Described digital potentiometer comprises digital signal interface.
2. a kind of variable gain in-phase amplifier device according to claim 1, it is characterized in that: also comprise filter capacitor, the ground connection input of described filter capacitor and operational amplifier and voltage output end are in parallel.
3. a kind of variable gain in-phase amplifier device according to claim 1, is characterized in that: described operational amplifier adopts OP184.
4. a kind of variable gain in-phase amplifier device according to claim 1, is characterized in that: described digital potentiometer adopts AD5292.
5. a kind of variable gain in-phase amplifier device according to claim 1, is characterized in that: the capacitance of described filter capacitor is set to 10PF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140429.5A CN104796103A (en) | 2015-03-30 | 2015-03-30 | Gain-variable noninverting amplifier device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140429.5A CN104796103A (en) | 2015-03-30 | 2015-03-30 | Gain-variable noninverting amplifier device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104796103A true CN104796103A (en) | 2015-07-22 |
Family
ID=53560663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510140429.5A Pending CN104796103A (en) | 2015-03-30 | 2015-03-30 | Gain-variable noninverting amplifier device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104796103A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897205A (en) * | 2016-04-06 | 2016-08-24 | 江苏星宇芯联电子科技有限公司 | Low-pass filtering variable gain instrument amplifier |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5603113A (en) * | 1993-06-16 | 1997-02-11 | Oki Telecom | Automatic gain control circuit for both receiver and transmitter adjustable amplifiers including a linear signal level detector with DC blocking, DC adding, and AC removing components |
| CN1165430A (en) * | 1996-03-29 | 1997-11-19 | 阿尔卑斯电气株式会社 | Amplifier circuit for transmitter |
| CN1636319A (en) * | 2000-10-10 | 2005-07-06 | 高通股份有限公司 | Gain linearizer for variable gain amplifiers |
-
2015
- 2015-03-30 CN CN201510140429.5A patent/CN104796103A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5603113A (en) * | 1993-06-16 | 1997-02-11 | Oki Telecom | Automatic gain control circuit for both receiver and transmitter adjustable amplifiers including a linear signal level detector with DC blocking, DC adding, and AC removing components |
| CN1165430A (en) * | 1996-03-29 | 1997-11-19 | 阿尔卑斯电气株式会社 | Amplifier circuit for transmitter |
| CN1636319A (en) * | 2000-10-10 | 2005-07-06 | 高通股份有限公司 | Gain linearizer for variable gain amplifiers |
Non-Patent Citations (1)
| Title |
|---|
| CBZHENG21: "利用数字电位计AD5292和运算放大器OP184构建可变增益反相放大器", 《百度文库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897205A (en) * | 2016-04-06 | 2016-08-24 | 江苏星宇芯联电子科技有限公司 | Low-pass filtering variable gain instrument amplifier |
| CN105897205B (en) * | 2016-04-06 | 2018-08-07 | 江苏星宇芯联电子科技有限公司 | A kind of variable gain instrument amplifier of low-pass filtering |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203071878U (en) | Wideband direct-current amplifier based on voltage-controlled operational amplifier | |
| CN203406831U (en) | Amplification circuit with zero correction circuit | |
| CN102355263B (en) | Improved signal acquisition conditioning circuit | |
| CN104270108B (en) | A kind of charge amplifier | |
| CN104796103A (en) | Gain-variable noninverting amplifier device | |
| CN205427035U (en) | High voltage sampling circuit of isolated form | |
| CN203563026U (en) | Low-pass buffer filter circuit | |
| CN203968069U (en) | The VHF frequency band signals amplifying circuit of a kind of pair of filtering | |
| CN204597902U (en) | A kind of variable gain in-phase amplifier device | |
| CN203166875U (en) | Modular servo device and atomic frequency standard | |
| CN202586351U (en) | Suppression device for power frequency interference signal of power transmission line | |
| CN104660214A (en) | Digital filter system | |
| CN205051664U (en) | Filter | |
| CN203747759U (en) | Power amplification circuit | |
| CN202059390U (en) | Improved signal acquisition and conditioning circuit | |
| CN104779953A (en) | Single-ended signal converting device | |
| CN204392203U (en) | A kind of absolute filter | |
| CN203761339U (en) | Signal sampling circuit structure | |
| CN203563016U (en) | Low-power-dissipation amplifier for mobile phones | |
| CN203364967U (en) | Photoelectric detection transmission circuit applied to ultraviolet detector | |
| CN210007676U (en) | audio amplifying circuit based on operational amplifier | |
| CN207475503U (en) | Novel filter circuit | |
| CN103856173A (en) | Differential amplifying circuit of piezoresistive pressure transducer | |
| CN204859118U (en) | A amplifier circuit for handling high frequency pulse signal | |
| CN203554392U (en) | Low-pass filtering circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150722 |
|
| RJ01 | Rejection of invention patent application after publication |