CN110460316A - Controllable gain amplifier - Google Patents
Controllable gain amplifier Download PDFInfo
- Publication number
- CN110460316A CN110460316A CN201910828884.2A CN201910828884A CN110460316A CN 110460316 A CN110460316 A CN 110460316A CN 201910828884 A CN201910828884 A CN 201910828884A CN 110460316 A CN110460316 A CN 110460316A
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- China
- Prior art keywords
- circuit
- input
- amplifier
- resistance
- multistage
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- 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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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
- H03G3/3089—Control of digital or coded signals
Abstract
The invention discloses a kind of controllable gain amplifiers, including amplifying circuit and gain control circuit, the amplifying circuit includes the input resistance circuit that amplifier and one group are respectively arranged on the amplifier positive input terminal and negative input end, input resistance circuit connection described in the gain control circuit and one group, gain control circuit for controlling cut-offfing for multistage input resistance in the input resistance circuit of amplifier positive input terminal and negative input end simultaneously, to control the amplification factor of amplifier.The present invention is different from the gain-controlled amplifier of traditional R-2R network, and design has the features such as high-precision, Yi Shixian, solves the problems, such as that resistance error is big in amplifying circuit, has high-precision controllable characteristics.
Description
Technical field
The present invention relates to amplifier technique field, especially a kind of controllable gain amplifier.
Background technique
In integrated circuit design, controllable gain amplifier is to be most widely used and a demanding module.Mostly
Number casacade multi-amplifier all can be using controllable gain amplifier circuit as intermediate amplifier.Although controllable gain amplifier design is multiple
It is miscellaneous, but it can quickly change gain output according to actual needs, and amplification can only be fixed in other amplifiers, tend not to full
The flexible and changeable design requirement of foot.
Summary of the invention
To solve problems of the prior art, the object of the present invention is to provide a kind of controllable gain amplifier, this hairs
The bright gain-controlled amplifier for being different from traditional R-2R network, design have the features such as high-precision, Yi Shixian, solve and put
The big problem of resistance error, has high-precision controllable characteristics in big circuit.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of controllable gain amplifier, including amplifying circuit
And gain control circuit, the amplifying circuit include that amplifier and one group are respectively arranged on the amplifier positive input terminal and negative input
The input resistance circuit at end, input resistance circuit connection described in the gain control circuit and one group, gain control circuit are used for
Cut-offfing for multistage input resistance in the input resistance circuit of amplifier positive input terminal and negative input end is controlled simultaneously, so that control is put
The amplification factor of big device.
As a preferred embodiment, input resistance circuit described in one group includes multistage input resistance and multistage
Metal-oxide-semiconductor, the multistage input resistance are sequentially connected in series, the output end of every level-one input resistance respectively with metal-oxide-semiconductor described in every level-one
Drain electrode connection, the source electrode of multistage metal-oxide-semiconductor are sequentially connected the rear input terminal with the amplifier and connect, the grid point of multistage metal-oxide-semiconductor
It is not connect with the gain control circuit, gain control circuit is for controlling cut-offfing for every level-one metal-oxide-semiconductor, to control multistage defeated
Enter the conducting number of resistance, is additionally provided with feedback resistance between the output end and input terminal of the amplifier.
As another preferred embodiment, the gain control circuit includes multilevel comparator and is sequentially connected in series to ground
Multilevel partial-pressure resistance, be connected with reference voltage on the input terminal of first order divider resistance, divider resistance described in every level-one it is defeated
Outlet is connect with the same input terminal of the multistage comparator respectively, is respectively connected on another input terminal of multilevel comparator
Gain control input voltage, the output end of every level-one comparator respectively with the same level-one metal-oxide-semiconductor in one group of input resistance circuit
Grid connection.
As another preferred embodiment, the gain control circuit further includes MODE control port, the MODE
Control port be used for the output result of the multistage comparator is reversed, by exporting the conversion of low and high level, realize it is positive and
Reversed selection output.
The beneficial effects of the present invention are: the present invention sets to solve the gain control method of traditional R-2R network in circuit
The inadequate problem of precision in meter field, in the case where amplifying especially for specific gain control, design has high-precision,
The features such as easily realizing, solves the problems, such as that resistance error is big in amplifying circuit, and the present invention has high-precision controllable characteristics, can be accurate
Offer design variable gain mode.
Detailed description of the invention
Fig. 1 is the circuit system overall schematic of controllable gain amplifier of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the input resistance circuit in the embodiment of the present invention comprising 49 grades of input resistances；
Fig. 3 is the electricity of input resistance circuit of the gain control circuit controls comprising 49 grades of input resistances in the embodiment of the present invention
Road schematic diagram.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment
As shown in Figure 1-Figure 3, a kind of controllable gain amplifier, including amplifying circuit and gain control circuit, the amplification
Circuit includes the input resistance circuit that amplifier OP and one group are respectively arranged on the amplifier OP positive input terminal and negative input end, institute
State input resistance circuit connection described in gain control circuit and one group, gain control circuit is used for while to control amplifier OP just defeated
Enter in the input resistance circuit of end and negative input end cut-offfing for multistage input resistance, to control the amplification factor of amplifier.
In the present embodiment, input resistance circuit described in one group includes multistage input resistance and multistage metal-oxide-semiconductor, multistage institute
It states input resistance to be sequentially connected in series, the output end of every level-one input resistance is connect with the drain electrode of metal-oxide-semiconductor described in every level-one respectively, multistage
The source electrode of metal-oxide-semiconductor is sequentially connected the rear input terminal with the amplifier and connect, the grid of multistage metal-oxide-semiconductor respectively with the gain control
Circuit connection processed, gain control circuit is for controlling cut-offfing for every level-one metal-oxide-semiconductor, to control the conducting of multistage input resistance
Number, is additionally provided with feedback resistance R between the output end and input terminal of the amplifier OPInstead。
In the present embodiment, the gain control circuit includes multilevel comparator U and the Multilevel partial-pressure that is sequentially connected in series to ground
Resistance R is connected with reference voltage V on the input terminal of first order divider resistance RBase, the output end point of divider resistance R described in every level-one
It is not connect with the same input terminal of the multistage comparator U, is respectively connected with gain on another input terminal of multilevel comparator U
Control input voltage VControl, the output end of every level-one comparator U respectively with the same level-one metal-oxide-semiconductor in one group of input resistance circuit R
Grid connection.
In the present embodiment, the gain control circuit further includes MODE control port, and the MODE control port is used for
The output result of the multistage comparator U is reversed, by exporting the conversion of low and high level, realize that the selection of forward and reverse is defeated
Out.
The working principle of the present embodiment is carried out by taking the controllable gain amplifier comprising 49 grades of input resistances as an example below detailed
Thin explanation:
Again as shown in Figure 1, the present embodiment core is the controllable gain amplification system of gain control circuit and amplifying circuit composition
System designs the input resistance R that control amplifier OP is realized based on gain control circuit0-R48Size, finally obtain corresponding increasing
The amplifying circuit of benefit.
Again as shown in Fig. 2, lower left corner two-way input terminal, respectively reference voltage V in Fig. 2BaseInput voltage is controlled with gain
VControl.Reference voltage VBaseUsing 49 groups of divider resistance R ground connection of power end series connection, the voltage of each comparator U is flowed into not
Equally, every group of constant reference voltage of comparator U, gain-controlled voltage V are formedControlBy inputting different voltage, finally pass through
49 road comparator U are compared, and obtain 49 groups of difference output digital signal levels, the final input resistance for controlling amplifying circuit
R0-R48Open and break.Wherein, the gain in the lower left corner controls input voltage VControlIt is the range for arriving 1V 0, passes through internal amplifier
Amplification, final output 0 arrive 5V output voltage, be compared with the reference voltage of comparator U, output array level letter
Number.
As shown in Fig. 2, the micro benchmark current source in the upper left corner is gain control circuit important component in the present embodiment,
It is inputted as the constant-current source that is not influenced by temperature process of electricity, by internal mirror images circuit, export 49 tunnels not by temperature and technique
The electric current of influence is output in every group of comparator U, finally provides its operating voltage.
As shown in Fig. 2, comparator U is compared to two input voltages, high level and low is exported according to comparison result
Level.In contrast circuit is simple by the comparator U of the present embodiment, does not need excessively complicated circuit, can obtain output and stablize
Level signal, for relatively reversed comparator, by reference voltage VBaseControl, circuit are more accurate.
As shown in Figures 2 and 3, the lower right corner Fig. 2 is a gain-controlled voltage slope negater circuit, particular by input
Gain control input voltage VControl, the 49 tunnel output signals obtained more afterwards by comparator U can be by 49 tunnels by this circuit
Output result after comparing reversely exports, and by adding the control port of a MODE, by the conversion of low and high level, realizes and increases
Within the scope of 0 to 5V, the reversed output voltage for becoming 5V to 0 be can finally be provided in follow up amplifier feed circuit for benefit input
The grid of metal-oxide-semiconductor V1-V48, each metal-oxide-semiconductor V1-V48 have corresponded to an input resistance R0-R48, it is corresponding eventually by control is cut-off
Input resistance R0-R48Input terminal is accessed, it is final to realize the corresponding enlarging function of amplifier OP.
As shown in figure 3, the amplifier OP input terminal of the present embodiment, by 49 groups of input resistance R0-R48It is in series, it is each defeated
Enter resistance R0-R48One metal-oxide-semiconductor V1-V48 of parallel connection export one group of 49 bit level signal point by gain control circuit early period
Not Kong Zhi metal-oxide-semiconductor V1-V48 grid, control input resistance R0-R48Number is connected, changes the voltage value of differential input end.Difference
Input terminal VI N and VI P are respectively connected to that amplitude is equal, contrary small signal, by the unlatching of some metal-oxide-semiconductor V1-V48,
The resistance value of access is also different, feedback resistance RInsteadIt can also change with the resistance value ratio of input, lead to the times magnification of system
Number also changes.
A specific embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (4)
1. a kind of controllable gain amplifier, which is characterized in that including amplifying circuit and gain control circuit, the amplifying circuit packet
Include amplifier and one group of input resistance circuit for being respectively arranged on the amplifier positive input terminal and negative input end, the gain control
Input resistance circuit connection described in circuit and one group, gain control circuit are used for while controlling amplifier positive input terminal and negative input
Multistage input resistance is cut-off in the input resistance circuit at end, to control the amplification factor of amplifier.
2. controllable gain amplifier according to claim 1, which is characterized in that input resistance circuit described in one group includes
Multistage input resistance and multistage metal-oxide-semiconductor, the multistage input resistance are sequentially connected in series, the output end of every level-one input resistance respectively with
The drain electrode of metal-oxide-semiconductor described in every level-one connects, and the source electrode of multistage metal-oxide-semiconductor is sequentially connected the rear input terminal with the amplifier and connect,
The grid of multistage metal-oxide-semiconductor is connect with the gain control circuit respectively, and gain control circuit is for controlling opening for every level-one metal-oxide-semiconductor
It is disconnected, to control the conducting number of multistage input resistance, feedback electricity is additionally provided between the output end and input terminal of the amplifier
Resistance.
3. controllable gain amplifier according to claim 2, which is characterized in that the gain control circuit includes multistage ratio
Compared with device and the Multilevel partial-pressure resistance being sequentially connected in series to ground, it is connected with reference voltage on the input terminal of first order divider resistance, it is each
The output end of the grade divider resistance is connect with the same input terminal of the multistage comparator respectively, multilevel comparator it is another
Be respectively connected on a input terminal gain control input voltage, the output end of every level-one comparator respectively with one group of input resistance circuit
In same level-one metal-oxide-semiconductor grid connection.
4. controllable gain amplifier according to claim 3, which is characterized in that the gain control circuit further includes MODE
Control port, the MODE control port are used for the output result of the multistage comparator is reversed, pass through output low and high level
Conversion, realize forward and reverse selection output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910828884.2A CN110460316A (en) | 2019-09-03 | 2019-09-03 | Controllable gain amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910828884.2A CN110460316A (en) | 2019-09-03 | 2019-09-03 | Controllable gain amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN110460316A true CN110460316A (en) | 2019-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910828884.2A Pending CN110460316A (en) | 2019-09-03 | 2019-09-03 | Controllable gain amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865244A (en) * | 2020-09-18 | 2020-10-30 | 成都嘉纳海威科技有限责任公司 | Digital control variable gain amplifier |
| CN112787611A (en) * | 2020-12-30 | 2021-05-11 | 四川长虹电器股份有限公司 | Controllable gain amplifier |
| CN113252973A (en) * | 2020-02-10 | 2021-08-13 | 矢崎总业株式会社 | Voltage detection device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347454A (en) * | 2016-03-28 | 2019-02-15 | 华为技术有限公司 | A kind of continuous variable gain amplifier |
| CN109391239A (en) * | 2018-09-11 | 2019-02-26 | 西安电子科技大学 | A kind of modified high linearity voltage controlled gain attenuator |
| CN109951161A (en) * | 2019-02-28 | 2019-06-28 | 东南大学 | A kind of complementary type digital variable gain amplifier |
-
2019
- 2019-09-03 CN CN201910828884.2A patent/CN110460316A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347454A (en) * | 2016-03-28 | 2019-02-15 | 华为技术有限公司 | A kind of continuous variable gain amplifier |
| CN109391239A (en) * | 2018-09-11 | 2019-02-26 | 西安电子科技大学 | A kind of modified high linearity voltage controlled gain attenuator |
| CN109951161A (en) * | 2019-02-28 | 2019-06-28 | 东南大学 | A kind of complementary type digital variable gain amplifier |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252973A (en) * | 2020-02-10 | 2021-08-13 | 矢崎总业株式会社 | Voltage detection device |
| CN111865244A (en) * | 2020-09-18 | 2020-10-30 | 成都嘉纳海威科技有限责任公司 | Digital control variable gain amplifier |
| CN112787611A (en) * | 2020-12-30 | 2021-05-11 | 四川长虹电器股份有限公司 | Controllable gain amplifier |
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Application publication date: 20191115 |
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| RJ01 | Rejection of invention patent application after publication |