CN109660221A - A kind of gain-changeable amplifier circuit - Google Patents
A kind of gain-changeable amplifier circuit Download PDFInfo
- Publication number
- CN109660221A CN109660221A CN201811550275.7A CN201811550275A CN109660221A CN 109660221 A CN109660221 A CN 109660221A CN 201811550275 A CN201811550275 A CN 201811550275A CN 109660221 A CN109660221 A CN 109660221A
- Authority
- CN
- China
- Prior art keywords
- resistance
- gain
- feedback
- pair
- path switch
- 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
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000007123 defense Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000009466 transformation 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
- H03G3/30—Automatic control in amplifiers having semiconductor devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45928—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit
- H03F3/45932—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit by using feedback means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses a kind of gain-changeable amplifier circuits, including fully-differential amplifier OP, input gain selecting module and output gain selecting module, input gain selecting module includes a pair of R-2R trapezoid resistance network and multistage path switch, two input signals of amplifier are input in fully-differential amplifier OP after a pair of of R-2R trapezoid resistance network respectively, wherein, 2R resistance in R-2R trapezoid resistance network is connect with the common mode input terminal VCOM of fully-differential amplifier OP, each of R-2R trapezoid resistance network R resistance accesses in fully-differential amplifier OP through multistage path switch respectively, output gain selecting module includes at least a pair of of feedback resistance, every a pair of feedback resistance is respectively arranged in two feedback loops of fully-differential amplifier OP, and path is equipped in feedback loop Switch.The present invention realizes the function of the flexible gain-variable of amplifier circuit using R-2R trapezoid resistance network and the optional mode of feedback resistance, covering application range that can be broader.
Description
Technical field
The present invention relates to the analog semiconductor integrated circuit technical field of semiconductor field, especially a kind of variable gain is put
Big device circuit.
Background technique
Amplifier is a universal basis in analog semiconductor integrated circuit design, and carrying out amplifier is design simulation half
The primary condition of conductor integrated circuit.The present invention is based on a military defense project.The target of project is based on domestic mature technology
Develop a four-way ultra-low noise gain variable amplifier.This amplifier has many outstanding performance indicators: voltage is made an uproar
Sound 0.74nV/ √ Hz, current noise 2.5pA/ √ Hz.Variable gain ranging -4.5dB~43.5dB (LO), 7.5dB~
55.5dB(HI).Realize these index reference chips using dedicated Bipolar technique, and we can only use it is domestic
Most mature CMOS technology.
So completely cannot be in CMOS using the amplifier gain adjusted circuit of bipolar junction transistor design in former chip
It is used in technique, in order to realize functionally consistent, so when designing whole chip.A kind of completely new put must be designed
Big device gain-variable circuit.Specifically in the upper of forward gain adjusted circuit, former chip is adjusted using the internal resistance of Bipolar
The overall electrical resistance of input stage, but since the cmos device in CMOS technology cannot be flexibly accurate using electric current and voltage bias
Adjustment oneself internal resistance size, so the circuit that former chip uses can not use, it is necessary to which brand-new design amplifier gain can
Power transformation road.
Summary of the invention
To solve problems of the prior art, the object of the present invention is to provide a kind of gain-changeable amplifier circuit,
The present invention realizes the flexible gain-variable of amplifier circuit using R-2R trapezoid resistance network and the optional mode of feedback resistance
Function, covering application range that can be broader.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of gain-changeable amplifier circuit, including complete poor
Divide amplifier OP, input gain selecting module and output gain selecting module, the input gain selecting module includes a pair of R-
2R trapezoid resistance network and multistage path switch, two input signals of amplifier are respectively through a pair of R-2R ladder shaped resistance net
Be input to after network in fully-differential amplifier OP, wherein 2R resistance in R-2R trapezoid resistance network with fully-differential amplifier OP
The VCOM connection of common mode input terminal, each of R-2R trapezoid resistance network R resistance connects through the multistage path switch respectively
Enter into fully-differential amplifier OP, the output gain selecting module includes at least a pair of of feedback resistance, every a pair feedback
Resistance is respectively arranged in two feedback loops of fully-differential amplifier OP, and is equipped with path switch in the feedback loop.
As a preferred embodiment, being closed at or disconnecting with path switch described in level-one to control whether one
R resistance in the R-2R trapezoid resistance network with level-one is accessed in fully-differential amplifier OP, and multistage path switch exists
Synchronization only has level-one path switch to be in closed state.
As another preferred embodiment, with the resistance value phase of two feedback resistances in a pair of feedback resistance
Deng.
As another preferred embodiment, in the output gain selecting module resistance value of any pair of feedback resistance with
The resistance value of the feedback resistance of other pairs is unequal.
As another preferred embodiment, with the path switch in two feedback loops of a pair of feedback resistance
It is closed at or disconnects, and the path switch in multipair feedback resistance feedback loop only has when same at a pair of of path switch
In closed state.
The beneficial effects of the present invention are: variable-gain amplification circuit of the invention is used based on R-2R trapezoid resistance network
Structure, and have expandable structure quite abundant, the control circuit of path switch may be from the digital control of chip other parts
Circuit.Gain-variable circuit used in invention not only can change the input stage resistance of amplifier, also can change anti-
The size for feeding resistance allows amplifier to have high gain mode and the optional function of low gain mode, allows amplifier to have broader
Gain variation range.General amplifier gain adjusted circuit only uses input stage resistance-variable circuit, such circuit one
As have more complicated resistance configuration point, and due to circuit of the invention use the amplification relatively high in a noise requirements
In device application, so too many resistance is connected on input stage, the noiseproof feature of amplifier will affect, and by the way of of the invention
The scale of gain circuitry can significantly be simplified.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described in detail with reference to the accompanying drawing.
Embodiment
As shown in Figure 1, a kind of gain-changeable amplifier circuit, including fully-differential amplifier OP, input gain selecting module
With output gain selecting module, the input gain selecting module includes that a pair of R-2R trapezoid resistance network and multistage path are opened
It closes, two input signals of amplifier are input to fully-differential amplifier OP after a pair of R-2R trapezoid resistance network respectively
In, wherein the 2R resistance in R-2R trapezoid resistance network is connect with the common mode input terminal VCOM of fully-differential amplifier OP, R-2R
Each of trapezoid resistance network R resistance accesses in fully-differential amplifier OP through the multistage path switch respectively, described
Output gain selecting module includes at least a pair of of feedback resistance, and every a pair feedback resistance is respectively arranged on fully-differential amplifier OP
Two feedback loops in, and be equipped with path switch in the feedback loop.
It is closed at or disconnects with path switch described in level-one to control whether a pair of R-2R trapezoid resistance network
In accessed in fully-differential amplifier OP with the R resistance of level-one, and multistage path switch only has level-one path to open in synchronization
It closes and is in closed state.
It is equal with the resistance value of two feedback resistances in a pair of feedback resistance.
The resistance value of any pair of feedback resistance and the resistance value of the feedback resistance of other pairs are equal in the output gain selecting module
It is unequal.
It is closed at or disconnects with the path switch in two feedback loops of a pair of feedback resistance, and multipair feedback
Path switch in resistance feedback circuit only has a pair of of path switch to be in closed state when same.
The present embodiment is described further with a military defense project of Sichuan Changhong Electric Appliance Co., Ltd below:
In actual application, sensor circuit of the input signal INN and INP from chip exterior.Enter the defeated of amplifier
Inbound port.But the signal of in general chip periphery will receive the influence of other external factors, signal magnitude is all less than normal, in this way
Amplify external signal with regard to needing a pre-amplification circuit.Meanwhile when input signal is bigger, for rear class electricity
The signal that road mustn't go to leads to the loss of signal without departing from the range between supply voltage and ground.It needs input signal to carry out
Diminution appropriate.Voltage control in suitable range.For some special circuits, need dynamically to control the increasing of signal
Benefit, to realize the needs of other functions.Preamplifier is needed to have a flexible gain selective power.Based on front several points
Application demand thus needs corresponding circuit then gain selection is the requirement for having certain complicated change procedure
At such function.
Again as shown in Figure 1, in the circuit applied by the present embodiment, gain-changeable amplifier circuit is chip as a whole
Second level input use, since amplifier here directly uses external signal as inputting, so in actual use
In have the very big voltage signal that may input very little, fainter signal is unfavorable for the processing of circuit below.So must
Signal need be amplified.Requirement in the project that the present embodiment uses, to the selection of gain here than wide, minimum-
10dB, maximum 69dB.So for amplifier.A more complicated gain selection circuit is needed to realize such mesh
Mark.In actual application, while configuration selection is all carried out to input resistance and feedback resistance.The collocation of front and back in this way can be with
The selection for realizing more gain points, extends gain requirements.
(1) input gain selecting module
Input gain selecting module includes: the input terminal of 1. amplifier, used here as a fully-differential amplifier OP conduct
Amplifier benchmark, the input port INN and INP of amplifier are placed on before a pair of of R-2R trapezoid resistance network, it is ensured that signal
Can directly enter amplifier in R-2R trapezoid resistance network.2. common mode input terminal VCOM, VCOM are configured to typical
Value 1/2VDD, while common mode input terminal VCOM enters fully-differential amplifier OP, also as 2R in R-2R trapezoid resistance network
The VCOM of resistance, this ensure that the voltage of common-mode point in need reference all guarantees to be connected in the reference point that needs connect,
The offset of amplifier is maximally reduced.3. R-2R trapezoid resistance network, R-2R trapezoid resistance network be by R resistance R1A,
R3A, R5A, R7A, RNA and R resistance R1B, R3B, R5B, R7B, RNB composition, both are set to 1K in the design of the present embodiment
Size.2R resistance is made of R2A, R4A, R6A, R8A, RVA and R2B, R4B, R6B, R8B, RVB, in the design of the present embodiment
It both is set to 2K size, R resistance R1A, R3A, R5A, R7A, RNA and R resistance R1B, R3B, R5B, R7B, RNB head and the tail are connected on
Together, finally it is connected to the input terminal of amplifier.2R resistance by R2A, R4A, R6A, R8A, RVA and R2B, R4B, R6B, R8B,
The one end RVB is connected on the series connection point of 1K size resistance, and the other end is connected on common mode input terminal VCOM.Particularly, according to setting
The R-2R network for needing the present embodiment of meter can be extended to different series to meet the needs of design.4. path switch, road
Diameter switch is made of S1A, S2A, S3A, SNA and S1B, S2B, S3B, SNB.It is other that the control circuit of path switch may be from chip
Partial digital control circuit, selected different paths are big to select the equivalent inpnt resistance for being linked into amplifier input point
It is small.Thus the gain size of amplifier can be set by configuring needs.
Input signal is directly connected to resistance R1A and R1B in the present embodiment, using a series of series connection until RNA
And RNB thus can be flexible from resistance R1A and R1B to the resistance combination that can have different series resistance RNA and RNB
Change the structure of design by the selection of continuation, when selecting series more, can there is better gain adjustment ability,
When selecting series fewer, there are smaller chip area and noiseproof feature, in the circuit applied by the present embodiment, selection
Series is 9 grades, and 9 grades are not too much nor very little quantity has taken into account various advantages above-mentioned, resistance R1A to RNA one
The R resistance of on row, on one row of resistance R1B to RNB composition R-2R trapezoid resistance network.On one row of resistance R2A to RVA,
The 2R resistance of composition R-2R trapezoid resistance network on one row of resistance R2B to RVB.These resistance together constitute R-2R resistor ladder
Shape resistor network.It is exactly that the directly variation of gain is presented that R-2R ladder network, which has an extraordinary advantage to the control of gain,
A kind of trend of exponential increase out, so obvious change can occur by the path of switchgear distribution in the variation of amplifier gain
Change.If the form that gain is converted into a kind of logarithmic function, such gain will show the trend of linear stable rising.
Such linear trend is conducive to the variation of the more accurate control gain of amplifier, from without changing too fast or becoming
Changed slow problem.Here switch S1A, S2A, S3A, SNA and S1B, S2B, S3B, SNB is by the number of the other modules of chip
Signal control.It is previously noted that R-2R trapezoid resistance network is arranged to 9 grades, so path switch is also provided with into 9 grades.Same
S1A and S1B can be closed in moment, and other switches will not be closed, and configuration circuit must assure that in synchronization only
One group closes the switch, otherwise will appear serious gain error.
(2) output gain selecting module
Output gain selecting module is to give amplifier more gain selection functions as input gain selecting module, by
It is generally used in the resistance of output gain selecting module bigger.So amplification coefficient, this implementation can be increased or decreased significantly
Example specifically includes: 1. feedback resistance R8A, R8B, R9A, R9B.R8A=R8B is set as in the present embodiment；R9A=R9B.R8A,
R8B and R9A, R9B have different sizes, to meet the variation of gain.R8A and R8B are configured to 150K in the present embodiment；
R9A and R9B are configured to 600K.Here sizes values are also to have certain ratio with the resistance sizes of forward gain selecting module
Relationship.The connection of accurate size could be generated in amplifier feed-back system in this way.2. path switch S8A, S8B, S9A, S9B,
Here for path switch as the multistage path switch in the input gain selecting module of front, S8A and S8B are also to close simultaneously
It closes or disconnects, to control resistance R8A and R8B；Similarly, S9A and S9B is closed at or disconnects, come control resistance R9A and
R9B.3. fully-differential amplifier OP, fully-differential amplifier OP are as the central circuit of entire gain selection circuit, other electricity
Resistance and path switch are worked around fully-differential amplifier OP.Fully-differential amplifier OP receives common mode voltage signal simultaneously
VCOM come complete amplifier common mode feedback function, guarantee output voltage swung up and down in common-mode point.4. output signal OUTN and
OUTP.Output signal OUTN and the differential signal that OUTP is with input signal INN as INP.Output signal OUTN and OUTP
A kind of signal that gain selected of late-class circuit can be supplied to.
In the output gain selecting module of rear class, feedback resistance R8A, R8B, R9A, R9B and fully-differential amplifier OP group
At amplifier feed-back network, there are corresponding 4 path switch on each paths of feedback resistance R8A, R8B, R9A, R9B
S8A,S8B,S9A,S9B.Here 4 path switch are also by the Digital Signals of the other modules of chip interior.Same
S8A and S8B can be closed in moment, and S9A and S9B switch will not be closed, and configuration circuit must assure that in synchronization
Only one group of switch is opened, otherwise will appear serious gain error.Switch S8A and S8B and S9A and S9B has corresponded to amplification
The selection of device high gain mode and low gain mode.When selecting R8A=R8B=150K resistance, module enters low gain
Mode, when selecting R9A=R9B=6000K resistance, module enters high gain mode.It arranges in pairs or groups again the input stage of amplifier
9 scales of R-2R trapezoid resistance network.This gain selection system just has 18 calibration mode selections.Because being previously noted defeated
Enter the mode that gain amplification is an exponential increase, may increase too fast, not be able to satisfy some application demands.On feedback loop
The problem of front is brought can be made up by designing different gain mode selections.
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 (5)
1. a kind of gain-changeable amplifier circuit, which is characterized in that including fully-differential amplifier OP, input gain selecting module and
Output gain selecting module, the input gain selecting module include a pair of R-2R trapezoid resistance network and multistage path switch,
Two input signals of amplifier are input in fully-differential amplifier OP after a pair of R-2R trapezoid resistance network respectively,
In, the 2R resistance in R-2R trapezoid resistance network is connect with the common mode input terminal VCOM of fully-differential amplifier OP, and R-2R is trapezoidal
Each of resistor network R resistance accesses in fully-differential amplifier OP through the multistage path switch respectively, the output
Gain selection module includes at least a pair of of feedback resistance, and every a pair feedback resistance is respectively arranged on the two of fully-differential amplifier OP
In a feedback loop, and path switch is equipped in the feedback loop.
2. gain-changeable amplifier circuit according to claim 1, which is characterized in that simultaneously with path switch described in level-one
Closing or opening controls whether the R resistance in a pair of R-2R trapezoid resistance network with level-one accessing to fully differential amplification
In device OP, and multistage path switch only has level-one path switch to be in closed state in synchronization.
3. gain-changeable amplifier circuit according to claim 1, which is characterized in that in a pair of feedback resistance
The resistance value of two feedback resistances is equal.
4. gain-changeable amplifier circuit according to claim 1 or 3, which is characterized in that the output gain selects mould
The resistance value of the feedback resistance of the resistance value and other pairs of any pair of feedback resistance is unequal in block.
5. gain-changeable amplifier circuit according to claim 1, which is characterized in that with the two of a pair of feedback resistance
Path switch in a feedback loop is closed at or disconnects, and the path switch in multipair feedback resistance feedback loop is same
When only have a pair of of path switch to be in closed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550275.7A CN109660221A (en) | 2018-12-18 | 2018-12-18 | A kind of gain-changeable amplifier circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550275.7A CN109660221A (en) | 2018-12-18 | 2018-12-18 | A kind of gain-changeable amplifier circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109660221A true CN109660221A (en) | 2019-04-19 |
Family
ID=66114546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811550275.7A Pending CN109660221A (en) | 2018-12-18 | 2018-12-18 | A kind of gain-changeable amplifier circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109660221A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116582092A (en) * | 2023-07-13 | 2023-08-11 | 深圳前海深蕾半导体有限公司 | Gain adjustment amplifier |
| CN116865695A (en) * | 2023-07-20 | 2023-10-10 | 灵动微电子(苏州)有限公司 | Common mode signal suppression circuit of variable gain amplifier |
| CN116865695B (en) * | 2023-07-20 | 2024-07-02 | 灵动微电子(苏州)有限公司 | Common mode signal suppression circuit of variable gain amplifier |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050057304A1 (en) * | 2003-09-15 | 2005-03-17 | Barrie Gilbert | Single-ended input, differential output low noise amplifier |
| CN1734932A (en) * | 2004-08-03 | 2006-02-15 | 瑞昱半导体股份有限公司 | Gain-changeable amplifying circuit |
| CN102916666A (en) * | 2011-08-02 | 2013-02-06 | 中国科学院微电子研究所 | Broadband programmable gain amplifier |
| CN103916085A (en) * | 2013-01-05 | 2014-07-09 | 华为技术有限公司 | Continuous variable gain amplifier |
| CN104584425A (en) * | 2012-05-10 | 2015-04-29 | 塔特公司 | Programmable-gain amplifier |
| US20160034094A1 (en) * | 2014-07-30 | 2016-02-04 | Samsung Electronics Co., Ltd. | Programmable gain amplifiers with offset compensation and touch sensor controller incorporating the same |
| CN107370465A (en) * | 2017-06-20 | 2017-11-21 | 和芯星通（上海）科技有限公司 | High-precision broadband programmable gain amplifier |
-
2018
- 2018-12-18 CN CN201811550275.7A patent/CN109660221A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050057304A1 (en) * | 2003-09-15 | 2005-03-17 | Barrie Gilbert | Single-ended input, differential output low noise amplifier |
| CN1734932A (en) * | 2004-08-03 | 2006-02-15 | 瑞昱半导体股份有限公司 | Gain-changeable amplifying circuit |
| CN102916666A (en) * | 2011-08-02 | 2013-02-06 | 中国科学院微电子研究所 | Broadband programmable gain amplifier |
| CN104584425A (en) * | 2012-05-10 | 2015-04-29 | 塔特公司 | Programmable-gain amplifier |
| CN103916085A (en) * | 2013-01-05 | 2014-07-09 | 华为技术有限公司 | Continuous variable gain amplifier |
| US20160034094A1 (en) * | 2014-07-30 | 2016-02-04 | Samsung Electronics Co., Ltd. | Programmable gain amplifiers with offset compensation and touch sensor controller incorporating the same |
| CN107370465A (en) * | 2017-06-20 | 2017-11-21 | 和芯星通（上海）科技有限公司 | High-precision broadband programmable gain amplifier |
Non-Patent Citations (2)
| Title |
|---|
| 李伟博: "电力线通信CMOS模拟前端接收器关键技术研究", 《万方数据知识服务平台》 * |
| 王晓东: "单电源运放的偏置原因分析与偏置方法", 《现代电子技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116582092A (en) * | 2023-07-13 | 2023-08-11 | 深圳前海深蕾半导体有限公司 | Gain adjustment amplifier |
| CN116582092B (en) * | 2023-07-13 | 2024-01-23 | 深圳前海深蕾半导体有限公司 | Gain adjustment amplifier |
| CN116865695A (en) * | 2023-07-20 | 2023-10-10 | 灵动微电子(苏州)有限公司 | Common mode signal suppression circuit of variable gain amplifier |
| CN116865695B (en) * | 2023-07-20 | 2024-07-02 | 灵动微电子(苏州)有限公司 | Common mode signal suppression circuit of variable gain amplifier |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106357226B (en) | Power amplifier module | |
| CN104917475B (en) | A kind of adjustable gain power amplifier, gain adjusting method therefore and mobile terminal | |
| CN101924527B (en) | Broadband programmable gain amplifier with precise gain step size | |
| CN105391470B (en) | A kind of method for switching network, device and terminal | |
| CN207652424U (en) | Emit equipment and electronic device | |
| Tsou et al. | A low-power CMOS linear-in-decibel variable gain amplifier with programmable bandwidth and stable group delay | |
| WO2015139352A1 (en) | Current analog audio amplifier | |
| CN105743454A (en) | Binary weighted linear-in-dB switch resistor type CMOS programmable gain amplifier | |
| CN109660221A (en) | A kind of gain-changeable amplifier circuit | |
| CN209545572U (en) | A kind of separate type radio frequency matrix switch of high-isolation | |
| CN114268285A (en) | Automatic gain control device with large-range power variation | |
| CN206602512U (en) | A kind of frequency hopping receives channel fast gain control system | |
| CN102710224A (en) | Multi-mode power amplifier and corresponding mobile communication equipment | |
| CN203057121U (en) | AGC circuit quick control system based on linear receiver | |
| CN101145761A (en) | Power amplifier temperature compensation device and method | |
| US11190150B2 (en) | CMOS triple-band RF VGA and power amplifier in linear transmitter | |
| CN208028859U (en) | A kind of receive-transmit system gain control circuit based on switching circuit | |
| CN106354327A (en) | Signal reception processing circuit and infrared touch systems | |
| CN112787611A (en) | Controllable gain amplifier | |
| CN216929983U (en) | Automatic gain control device with wide power variation range | |
| CN208401737U (en) | A kind of automatic gain control circuit of New Charge pump configuration | |
| CN108347163A (en) | A kind of automatic gain control circuit and its control method of New Charge pump configuration | |
| CN100428625C (en) | Radio frequency band low temperature low noise amplifier | |
| CN206251103U (en) | A kind of signal protection circuit and device | |
| CN107317563A (en) | A kind of difference selection filter circuit and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190419 |
|
| RJ01 | Rejection of invention patent application after publication |