CN108365826A - A kind of programmable gain amplifier - Google Patents
A kind of programmable gain amplifier Download PDFInfo
- Publication number
- CN108365826A CN108365826A CN201711431388.0A CN201711431388A CN108365826A CN 108365826 A CN108365826 A CN 108365826A CN 201711431388 A CN201711431388 A CN 201711431388A CN 108365826 A CN108365826 A CN 108365826A
- Authority
- CN
- China
- Prior art keywords
- multiplying
- programmable gain
- amplifier
- type dac
- gain amplifier
- 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.)
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Links
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004883 computer application Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005259 measurement Methods 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
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3089—Control of digital or coded signals
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The present invention relates to a kind of programmable gain amplifiers, multiplying-type DAC in the programmable gain amplifier has serial line interface or parallel interface, and using inside multiplying-type DAC inverted T-shaped resistor network and operational amplifier be composed, the feedback end of high-precision weighted resistance network inside multiplying-type DAC therein is operational amplifier signal input part, and reference edge is the output feedback end of operational amplifier.Using the present invention, design is simple and small, and easy to control and precision is high, using flexible and of low cost.
Description
Technical field
The present invention relates to a kind of programmable gain amplifiers.
Background technology
With computer application, in order to reduce hardware device, programmable gain amplifier (PGA can be used:
Programmable Gain Amplifier), it is a kind of very strong amplifier of versatility, and amplification factor can be according to need
It is controlled with program.Using this amplifier, amplification factor can be adjusted by program, make A/D converter full scale signal
Reach homogenization, thus greatly improves measurement accuracy.So-called automatic measuring range is exactly as needed to handled signal profit
The automatic adjustment that multiple is carried out with programmable gain amplifier, to meet the requirement of subsequent conditioning circuit and system.
Currently, programmable gain amplifier have combination PGA and two kinds of integrated PGA, combination PGA generally by operational amplifier,
Along with some other adjunct circuits composition, operation principle is more by program adjustment for instrumentation amplifier or isolated form discharger
The numerical value for the feedback resistance that road change-over switch is connected, so as to adjust the amplification factor of amplifier, combination PGA flexible designs can be very
The PGA of various amplification factors is readily designed, but its design is complicated, circuit is bulky, and precision is not also high.Special design
The i.e. integrated PGA of programmable gain amplifier circuit, there are many type for integrating PGA circuits, such as Wei Xin Microchip companies of the U.S.
MCP6S21, MCP6S22, MCP6S26, MCP6S28 series of production, analog meter company of U.S. Analog Devices productions
AD8321 etc., belong to programmable gain amplifier, integrate PGA using simple, small, precision is high, but expensive
Especially can a variety of gains selection PGA, result in the limitation of actual circuit design.
Invention content
It is at low cost the object of the present invention is to provide the flexible design of existing combination PGA, and have the use of integrated PGA simple,
It is small, a kind of design method of programmable gain amplifier of advantage with high accuracy.
The technical solution adopted by the present invention is that：A kind of programmable gain amplifier, it is characterised in that the programmable-gain is put
Big device is made of multiplying-type DAC and operational amplifier, the feedback end of the high-precision weighted resistance network inside multiplying-type DAC therein
For operational amplifier signal input part, reference edge is the output feedback end of operational amplifier.
A kind of programmable gain amplifier, it is characterised in that the multiplying-type DAC in the programmable gain amplifier
With serial line interface or parallel interface, and by inside multiplying-type DAC inverted T-shaped resistor network and operational amplifier be composed.
The present invention is taken to have the advantages that：(1) design is simple, and volume is substantially reduced, it is only necessary to which two chips are
It can；(2) control is simple, and precision is high, ensures gain accuracy using the high-precision weighted resistance network inside multiplying-type DAC, and only
Need the D of control DACnThe control to gain can be realized；(3) using flexible, by changing different multiplying-type DAC and operation
Amplifier can be combined into the PGA of various different bandwidths and different gains series, optional 8 to 16 such as DAC；If selecting phase
With the DAC and amplifier of encapsulation, when changing PGA bandwidth or gain series, it is not necessary to modify PCB, by selection Serial DAC or simultaneously
Row DAC can take into account the demand (Serial DAC is small, and parallel DAC controls speed is fast) of PCB volumes and control speed and can be right
Answer the microcontroller or controller of distinct interface；(4) of low cost, this programme is more than integrated in the case of identical gain amplifier series
PGA is of low cost.
Description of the drawings
Fig. 1 is 12 multiplying-type DAC internal resistance schematic network structures of the present invention.
Fig. 2 is the 12 Bits Serial multiplying-type DAC internal structure charts of the present invention.
Fig. 3 is the 12 parallel-by-bit multiplying-type DAC internal structure charts of the present invention.
Fig. 4 is the connection diagram of the present invention.
Specific implementation mode
With reference to specific embodiment, the invention will be further described.
Referring to Fig.1, multiplying-type DAC belongs to R-2R type DAC, i.e. inverted T-shaped resistor network D/A converter,
With reference to Fig. 2 or Fig. 3, multiplying-type DAC can be the multiplying-type DAC with serial line interface or parallel interface.
With reference to Fig. 4, which is made of multiplying-type DAC and operational amplifier, multiplying-type DAC is simplified
For 4bit, the ports feedback end RFB of the high-precision weighted resistance network inside multiplying-type DAC therein are that operational amplifier signal is defeated
Entering end, the ends reference edge VREF are the output feedback end of operational amplifier, and S3, S2, S1 and S0 are 4 internal electron switches, they
State respectively by input code d3, d2, d1 and d0 value control, code be 1 when switch be connected on V-, code be 0 when open
Pass is connected on V+.When operational amplifier is as sign-changing amplifier, V- and V+ level is equal close to zero, and all no matter switch is connected to
Which side, be all equivalent to and be connected to " " on current potential, the electric current for flowing through each branch is also constant always.Weighted resistance network part
Equivalent resistance is R, if output total current is I, the electric current for flowing through each branch is respectively I/2, I/4, I/8 and I/16, wherein I
=VOUT/R.It realizes the programmable method of the gain of entire circuit and steps are as follows:
If 1, enabling diSwitch Si is grounded (V+ for connecing amplifier) when=0, and di=1When SiIt is connected to the input terminal of amplifier
V-, then D as shown in Figure 4n
2, input terminal has VSIN=-Ri∑, substitute into I=VOUT/R and obtain
3, the multiplying-type DAC inputted for n, then the analog voltage formula exported are
DnFor n bits, ranging from 0~2n-1。
4, above formula illustrates the digital quantity of output voltage and input inversely, and the gain of entire circuit is
5, conclusion：Control DnNumerical value can be realized entire circuit gain it is programmable.
Claims (2)
1. a kind of programmable gain amplifier, it is characterised in that the programmable gain amplifier is by multiplying-type DAC and operation amplifier
Device is constituted, and the feedback end of the high-precision weighted resistance network inside multiplying-type DAC therein is operational amplifier signal input part, ginseng
Examine the output feedback end that end is operational amplifier.
2. a kind of programmable gain amplifier according to claim 1, it is characterised in that in the programmable gain amplifier
Multiplying-type DAC there is serial line interface or parallel interface, and by the inverted T-shaped resistor network and operation amplifier inside multiplying-type DAC
Device is composed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431388.0A CN108365826B (en) | 2017-12-26 | 2017-12-26 | Programmable gain amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431388.0A CN108365826B (en) | 2017-12-26 | 2017-12-26 | Programmable gain amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108365826A true CN108365826A (en) | 2018-08-03 |
| CN108365826B CN108365826B (en) | 2024-07-12 |
Family
ID=63010544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711431388.0A Active CN108365826B (en) | 2017-12-26 | 2017-12-26 | Programmable gain amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108365826B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365303A (en) * | 2019-07-11 | 2019-10-22 | 厦门大学嘉庚学院 | A kind of controllable gain amplifier and control method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257329A (en) * | 2006-12-06 | 2008-09-03 | 美国博通公司 | Method and system for controlling circuit in emitter |
| CN103248330A (en) * | 2013-01-31 | 2013-08-14 | 南京邮电大学 | Programmable gain amplifier with high gain accuracy |
| CN105203089A (en) * | 2015-09-30 | 2015-12-30 | 中国人民解放军海军工程大学 | Selsyn solid-state axial angle sending system |
| CN105515472A (en) * | 2016-01-25 | 2016-04-20 | 无锡凌鸥微电子有限公司 | Motor drive current detection circuit and control system |
| CN105743454A (en) * | 2016-01-31 | 2016-07-06 | 天津大学 | Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier |
| CN106936438A (en) * | 2015-11-02 | 2017-07-07 | Ess技术有限公司 | Programmable circuit part with recurrence framework |
| CN207677696U (en) * | 2017-12-26 | 2018-07-31 | 浙江禾川科技股份有限公司 | A kind of programmable gain amplifier |
-
2017
- 2017-12-26 CN CN201711431388.0A patent/CN108365826B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257329A (en) * | 2006-12-06 | 2008-09-03 | 美国博通公司 | Method and system for controlling circuit in emitter |
| CN103248330A (en) * | 2013-01-31 | 2013-08-14 | 南京邮电大学 | Programmable gain amplifier with high gain accuracy |
| CN105203089A (en) * | 2015-09-30 | 2015-12-30 | 中国人民解放军海军工程大学 | Selsyn solid-state axial angle sending system |
| CN106936438A (en) * | 2015-11-02 | 2017-07-07 | Ess技术有限公司 | Programmable circuit part with recurrence framework |
| CN105515472A (en) * | 2016-01-25 | 2016-04-20 | 无锡凌鸥微电子有限公司 | Motor drive current detection circuit and control system |
| CN105743454A (en) * | 2016-01-31 | 2016-07-06 | 天津大学 | Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier |
| CN207677696U (en) * | 2017-12-26 | 2018-07-31 | 浙江禾川科技股份有限公司 | A kind of programmable gain amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110365303A (en) * | 2019-07-11 | 2019-10-22 | 厦门大学嘉庚学院 | A kind of controllable gain amplifier and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108365826B (en) | 2024-07-12 |
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