CN106849893A - Variable-gain amplifying circuit and implementation method, signal processing apparatus - Google Patents
Variable-gain amplifying circuit and implementation method, signal processing apparatus Download PDFInfo
- Publication number
- CN106849893A CN106849893A CN201611148206.4A CN201611148206A CN106849893A CN 106849893 A CN106849893 A CN 106849893A CN 201611148206 A CN201611148206 A CN 201611148206A CN 106849893 A CN106849893 A CN 106849893A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- variable
- gain
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003321 amplification Effects 0.000 claims abstract description 44
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 44
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 8
- 230000005669 field effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction 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
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
-
- 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
- H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of variable-gain amplifying circuit and implementation method, signal processing apparatus, belong to signal amplification circuit technical field.The amplifying circuit includes signal amplification circuit, for being amplified to signal；Feedback circuit, the input for the output signal of the signal amplification circuit to be fed back to the signal amplification circuit；Variable-gain circuit；For being adjusted by changing gain of the resistance parameter in the feedback circuit to the signal amplification circuit.The present invention changes the resistance parameter in the feedback circuit by the variable-gain circuit, and then gain to the signal amplification circuit is adjusted, and realizes the fine setting to signal amplification factor.In multistage amplifier circuit, the effect of fine setting becomes apparent from.
Description
It is on December 24th, 2013, Application No. 201310721929.9, entitled that present patent application is the applying date
The divisional application of the Chinese invention patent application of " variable-gain amplifying circuit and implementation method, signal processing apparatus ".
Technical field
The present invention relates to signal amplification circuit technical field, more particularly to variable-gain amplifying circuit and implementation method, signal
Processing unit.
Background technology
In current electronic product, the application of amplifying circuit is very universal, and especially in tiny signal, (such as sound is believed
Number, optical signal etc.) be converted into the occasion of electric signal application.
Amplification process typically all can be directly amplified using the amplifying circuit of at least two-stage to signal.And once set
After good signal amplification factor, signal amplifier just uses a fixed multiplication factor, and multiplication factor is unadjustable.However,
In the case that some need fine setting, this kind of amplification method to signal cannot get best signal on the contrary.It can be seen that, it is this kind of to amplify electricity
Road lacks flexibility, and the stability for ultimately resulting in the signal after amplifying declines.
The content of the invention
In order to the multiplication factor for solving existing signal amplification circuit such as can not finely tune at the deficiency, put the invention provides variable-gain
Big circuit and implementation method, signal processing apparatus.
The technical scheme is that：A kind of variable-gain amplifying circuit, the variable-gain amplifying circuit includes：
Signal amplification circuit, for being amplified to signal；
Feedback circuit, the input for the output signal of the signal amplification circuit to be fed back to the signal amplification circuit
End；
Variable-gain circuit, for by changing increasing of the resistance parameter in the feedback circuit to the signal amplification circuit
Benefit is adjusted；
Wherein, the signal amplification circuit includes operational amplifier；
The feedback circuit includes the first electric capacity, first resistor and second resistance；The first end of first electric capacity and
Two ends are connected with the output end and inverting input of the operational amplifier respectively；The first end of first resistor and the second end are distinguished
It is connected with the output end and inverting input of the operational amplifier；The first end of the second resistance and the operational amplifier
Inverting input connection；The second end ground connection of the second resistance；
The variable-gain circuit is in parallel with the second resistance；
The variable-gain circuit includes 3rd resistor, the first FET；The first end of the 3rd resistor and described
The first end connection of two resistance；The drain electrode end connection of the second end of the 3rd resistor and first FET；Described
The second end connection of the source electrode of one FET and the second resistance；By being turned on or off for first FET,
Change the actual resistance parameter of the second resistance branch road in the feedback circuit.
Present invention also offers a kind of signal processing apparatus, the signal processing apparatus include being put by variable-gain described above
The cascade circuit of big circuits cascading composition.
Preferably, High frequency filter electricity is provided between variable-gain amplifying circuit described in two groups adjacent in the cascade circuit
Road；The output end of the afterbody gain amplifying circuit of the cascade circuit is provided with low-frequency filter circuit.
The invention allows for a kind of implementation method of variable-gain amplifying circuit, the method includes：
By the resistor coupled in parallel in the feedback circuit of variable-gain circuit and signal amplification circuit；
Change the resistance parameter in the feedback circuit by the on or off of the variable-gain circuit, realize to described
The gain of signal amplification circuit is adjusted；
Wherein, the signal amplification circuit includes operational amplifier；
The feedback circuit includes the first electric capacity, first resistor and second resistance；The first end of first electric capacity and
Two ends are connected with the output end and inverting input of the operational amplifier respectively；The first end of first resistor and the second end are distinguished
It is connected with the output end and inverting input of the operational amplifier；The first end of the second resistance and the operational amplifier
Inverting input connection；The second end ground connection of the second resistance；
The variable-gain circuit is in parallel with the second resistance；
The variable-gain circuit includes 3rd resistor, the first FET；The first end of the 3rd resistor and described
The first end connection of two resistance；The drain electrode end connection of the second end of the 3rd resistor and first FET；Described
The second end connection of the source electrode of one FET and the second resistance；By being turned on or off for first FET,
Change the actual resistance parameter of the second resistance branch road in the feedback circuit.
Preferably, the on or off of the variable-gain circuit is controlled by controlling circuit.
The present invention changes the resistance parameter in the feedback circuit by the variable-gain circuit, and then the signal is put
The gain of big circuit is adjusted, and realizes the fine setting to signal amplification factor.In multistage amplifier circuit, the effect of fine setting is more
Substantially.
Brief description of the drawings
Fig. 1 is a practical circuit diagram of embodiment 1；
Fig. 2 is the method flow diagram of embodiment 2；
Fig. 3 is a practical circuit diagram of embodiment 3.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is explicitly described, it is clear that described embodiment be the present invention
A part of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
The every other embodiment obtained under the premise of creative work is made, the scope of protection of the invention is belonged to.
The invention provides variable-gain amplifying circuit and implementation method, signal processing apparatus, amplified with solving existing signal
The multiplication factor of circuit such as can not finely tune at the deficiency.
Embodiment 1
A kind of variable-gain amplifying circuit is present embodiments provided, the amplifying circuit includes：
Signal amplification circuit, for being amplified to signal；
Feedback circuit, the input for the output signal of the signal amplification circuit to be fed back to the signal amplification circuit
End；
Variable-gain circuit；For by changing increasing of the resistance parameter in the feedback circuit to the signal amplification circuit
Benefit is adjusted.
The present embodiment changes the resistance parameter in the feedback circuit by the variable-gain circuit, and then to the signal
The gain of amplifying circuit is adjusted, and realizes the fine setting to signal amplification factor.In multistage amplifier circuit, the effect of fine setting
Become apparent from.
The signal amplification circuit of the present embodiment includes operational amplifier U1.The feedback circuit includes the first electric capacity
C1, first resistor R1 and second resistance R2；The first end of the first electric capacity C1 and the second end respectively with the operational amplifier
Output end and the inverting input connection of U1；The first end of first resistor R1 and the second end are respectively with the operational amplifier U1's
Output end and inverting input are connected；The inverting input of the first end of the second resistance R2 and the operational amplifier U1 connects
Connect；The second end ground connection of the second resistance R2.The positive input end grounding of the operational amplifier U1.
The variable-gain circuit is in parallel with the second resistance R2；The variable-gain circuit includes 3rd resistor R3, first
FET Q1, the second electric capacity C2 and the 4th resistance R4；The of the first end of the 3rd resistor R3 and the second resistance R2
One end connects；The drain electrode end connection of second end of the 3rd resistor R3 and the first FET Q1；Second electric capacity
The first end of C2 and the second end connect with the grid of the first FET Q1 and the source electrode of the first FET Q1 respectively
Connect；The first end of the 4th resistance R4 and the second end are imitated with the grid of the first FET Q1 and described first respectively
Should pipe Q1 source electrode connection；The second end connection of the source electrode and the second resistance R2 of the first FET Q1.
The variable-gain amplifying circuit is further comprised：Control circuit, the control circuit and first field-effect
The grid connection of pipe Q1, conducting and disconnection for controlling the first FET Q1.The control circuit includes control core
Piece；The control chip respectively with the grid of the first FET Q1 of power supply, signal processor and the variable-gain amplifying circuit
Pole connects.
Additionally, the variable-gain amplifying circuit further comprises filter capacitor C0 and current-limiting resistance R0, current-limiting resistance R0
First end and power supply VCC connections, the power end connection of second end of current-limiting resistance R0 and operational amplifier U1；Filter capacitor C0
First end and current-limiting resistance R0 the second end connection；The second end ground connection of filter capacitor C0.Current-limiting resistance R0 is used to limit stream
Enter the electric current of operational amplifier U1, filter capacitor C0 is filtered to power supply VCC.The normal phase input end of operational amplifier U1 connects
Ground.The output of operational amplifier U1 is terminated with low-pass filter circuit；The low-pass filter circuit includes the 3rd electric capacity C3 and the 5th
Resistance R5.The output end connection of the first end and the operational amplifier U1 of the 5th resistance R5；The 5th resistance R5's
The first end connection of the second end and the 3rd electric capacity C3；The second end ground connection of the 3rd electric capacity C3.Whole variable-gain amplifies
The first end connection of the output end of circuit and the 3rd electric capacity C3, the i.e. output end of operational amplifier U1 amplify electricity with whole variable-gain
Above-mentioned low-pass filter circuit is connected between the output end on road.
In signal processing, the signal processor by control it is described control circuit control chip, decide whether
Turn on the first FET Q1.When the first FET Q1 is not turned on, signal presses normal Product management model, when
When needing to be finely adjusted the multiplication factor of amplifying circuit, signal processor turns on described first by controlling the control chip
FET Q1.Now, the feedback parameter of feedback circuit there occurs change.When not turning on the first FET Q1, amplify
The multiplication factor β 1 of circuit is：When the first FET Q1 is turned on, the second resistance R2 and
Three resistance R3 form parallel circuit, and the resistance after parallel connection is less than second resistance R2 and 3rd resistor R3, times magnification now
Number is：Wherein, | | represent in parallel.Before multiplication factor is not turned on relative to the first FET Q1
Multiplication factor is increased, and realizes the fine setting to multiplication factor.One practical circuit diagram of the present embodiment is as shown in Figure 1.
Embodiment 2
The present embodiment and embodiment 1 belong to same inventive concept, present embodiments provide a kind of variable-gain amplifying circuit
Implementation method, the method includes：
S1：By the resistor coupled in parallel in the feedback circuit of variable-gain circuit and signal amplification circuit；
S2：Change the resistance parameter in the feedback circuit by the on or off of the variable-gain circuit, it is right to realize
The gain of the signal amplification circuit is adjusted.The on or off of the variable-gain circuit is controlled by controlling circuit
System.The method flow diagram of the present embodiment is as shown in Figure 2.
Fig. 2 is refer to, the present embodiment is also including the signal amplification circuit described in embodiment 1, feedback circuit and variable-gain electricity
Road.The feedback circuit includes the first electric capacity C1, first resistor R1 and second resistance R2；The first end of the first electric capacity C1 and
Second end is connected with the output end and inverting input of the operational amplifier U1 respectively；The first end of first resistor R1 and second
End is connected with the output end and inverting input of the operational amplifier U1 respectively；The first end of the second resistance R2 and described
The inverting input connection of operational amplifier U1；The second end ground connection of the second resistance R2.
The variable-gain circuit is in parallel with the second resistance R2；The variable-gain circuit includes 3rd resistor R3, first
FET Q1, the second electric capacity C2 and the 4th resistance R4；The of the first end of the 3rd resistor R3 and the second resistance R2
One end connects；The drain electrode end connection of second end of the 3rd resistor R3 and the first FET Q1；Second electric capacity
The first end of C2 and the second end connect with the grid of the first FET Q1 and the source electrode of the first FET Q1 respectively
Connect；The first end of the 4th resistance R4 and the second end respectively with the grid and first FET of the first FET Q1
The source electrode connection of Q1；The second end connection of the source electrode and the second resistance R2 of the first FET Q1.
The variable-gain amplifying circuit is further comprised：Control circuit, the control circuit and first field-effect
The grid connection of pipe Q1, conducting and disconnection for controlling the first FET Q1.The control circuit includes control core
Piece；The control chip respectively with the grid of the first FET Q1 of power supply, signal processor and the variable-gain amplifying circuit
Pole connects.
Additionally, the variable-gain amplifying circuit further comprises filter capacitor C0 and current-limiting resistance R0, current-limiting resistance R0
First end and power supply VCC connections, the power end connection of second end of current-limiting resistance R0 and operational amplifier U1；Filter capacitor C0
First end and current-limiting resistance R0 the second end connection；The second end ground connection of filter capacitor C0.Current-limiting resistance R0 is used to limit stream
Enter the electric current of operational amplifier U1, filter capacitor C0 is filtered to power supply.The positive input end grounding of operational amplifier U1.Fortune
The output for calculating amplifier U1 is terminated with low-pass filter circuit；The low-pass filter circuit includes the 3rd electric capacity C3 and the 5th resistance
R5.The output end connection of the first end and the operational amplifier U1 of the 5th resistance R5；The second of the 5th resistance R5
The first end of end and the 3rd electric capacity C3 is connected；The second end ground connection of the 3rd electric capacity C3.Whole variable-gain amplifying circuit
Output end and the 3rd electric capacity C3 first end connection.
In signal processing, the signal processor by control it is described control circuit control chip, decide whether
Turn on the first FET Q1.When the first FET Q1 is not turned on, signal presses normal Product management model, when
When needing to be finely adjusted the multiplication factor of amplifying circuit, the control chip is controlled to turn on first effect by processor
Should pipe Q1.Now, the feedback parameter of feedback circuit there occurs change.When not turning on the first FET Q1, amplifying circuit
Multiplication factor β 1 be：When the first FET Q1 is turned on, the electricity of the second resistance R2 and the 3rd
Resistance R3 forms parallel circuit, and the resistance after parallel connection is less than second resistance R2 and 3rd resistor R3, and multiplication factor now is：Multiplication factor before multiplication factor is not turned on relative to the first FET Q1 is increased, and is realized
Fine setting to multiplication factor.
Embodiment 3
A kind of signal processing apparatus are present embodiments provided, the signal processing apparatus are included as described in above-described embodiment 1
The cascade circuit of variable-gain amplifying circuit cascade composition；One practical circuit diagram of the present embodiment is as shown in Figure 3.Fig. 3 is one
The signal amplification circuit of two-stage, the signal amplification circuit below by way of this two-stage is illustrated to the present embodiment, when for 3 grades or
It is similar to the reasoning of two-stage signal amplifying circuit with following during the amplifying circuit of more stages.
In the cascade circuit high-frequency filter circuit is provided between variable-gain amplifying circuit described in adjacent two groups；It is described
The output end of the afterbody gain amplifying circuit of cascade circuit is provided with low-frequency filter circuit；Become described in described adjacent two groups
Gain amplifying circuit is divided into the first variable-gain amplifying circuit and the second variable-gain amplifying circuit；
The high-frequency filter circuit includes the 6th electric capacity C6 and the tenth resistance R10；The first end of the 6th electric capacity C6 and
The output end connection of one group of gain amplifying circuit in variable-gain amplifying circuit described in described adjacent two groups；6th electric capacity
Second end of C6 and it is described adjacent two groups described in another group of gain amplifying circuit in variable-gain amplifying circuit positive input
End connection；The second end connection of the first end and the 6th electric capacity C6 of the tenth resistance R10；The tenth resistance R10's
Second end is grounded；The present embodiment is two-stage signal amplifying circuit, so the first end of the 6th electric capacity C6 and the computing are put
The output end connection of big device U1；The normal phase input end connection at second end and the operational amplifier U2 of the 6th electric capacity C6.
The low-frequency filter circuit includes the 3rd electric capacity C3 and the 5th resistance R5；The first end of the 5th resistance R5 and
Two ends connect with the output end of the afterbody gain amplifying circuit of the cascade circuit and the output end of the cascade circuit respectively
Connect；The second end connection of the first end and the 5th resistance R5 of the 3rd electric capacity C3；Second end of the 3rd electric capacity C3
Ground connection.The present embodiment is two-stage signal amplifying circuit, and the first end of the 5th resistance R5 and the operational amplifier U2's is defeated
Go out end connection；The first end connection at second end and the 3rd electric capacity C3 of the 5th resistance R5；The 3rd electric capacity C3's
Second end is grounded.
Likewise, second level signal amplification circuit also has variable-gain circuit, as shown in figure 3, corresponding including the second feedback
Circuit and the second variable-gain circuit.Second feedback circuit includes the 6th resistance R6, the 7th resistance R7 and the 4th electric capacity C4；Institute
Stating the second variable-gain circuit includes the 8th resistance R8, the 9th resistance R9, the second FET Q2 and the 5th electric capacity C5.
So, the second signal amplifying circuit of the present embodiment just has 4 kinds of regulative modes：
(1) when processor controls control chip output low level, the first FET Q1 and the second FET
Q2 is not turned on, and now the total magnification β of signal is：1 × β of β 2, wherein, β 2 is the signal times magnification of operational amplifier U2
Number,
(2) when control chip exports low level to the second FET Q2, and high level is exported to the first FET Q1,
First FET Q1 is turned on, and the second FET Q2 is not turned on, and the multiplication factor of operational amplifier U1 changes, times magnification
Number is changed into β 1 ' from β 1, and now the total magnification β of signal is：β1′×β2.
(3) when control chip exports low level to the first FET Q1, and high level is exported to the second FET Q2,
Second FET Q2 is turned on, and the first FET Q1 is not turned on, and the multiplication factor of operational amplifier U2 changes, times magnification
Number is changed into β 2 ' from β 2, and now the total magnification β of signal is：β1×β2′.Wherein, β 2 ' is the 7th resistance R7 and the 8th resistance
The signal amplification factor of operational amplifier U2 after R8 parallel connections,
(4) when processor controls control chip output high level, the first FET Q1 and the second FET
Q2 is turned on, and now the total magnification β of signal is：β1′×β2′.
The amplification of the level, operational amplifier U1 and operational amplifier U2 of the control chip output of situation in correspondence above-mentioned 4
The corresponding relation of multiple is：
| Situation | The multiplication factor of operational amplifier U1 | The multiplication factor of operational amplifier U1 |
| (1) | β1 | β2 |
| (2) | β1′ | β2 |
| (3) | β1 | β2′ |
| (4) | β1′ | β2′ |
The present embodiment includes multilevel signal amplifying circuit, is adjusted by the multiplication factor to every grade of amplifying circuit, can
It is finely adjusted to amplifying signal wider, the applicability of the invention for further expanding.
In above-described embodiment, a variable-gain circuit is connected on each operational amplifier to change the resistance of circuit,
And then change the resistance parameter in feedback circuit, the gain of amplifying circuit is adjusted and is realized to the micro- of signal amplification factor
Adjust, the present invention is not limited to this, can adaptations circuit according to actual needs, for example connect on each operational amplifier
Multiple variable-gain circuits have been connect, it is in parallel between variable-gain circuit, number is opened from there through control variable-gain circuit, come more
The diversified resistance for changing circuit, finally realizes the further fine setting of signal amplification factor.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of variable-gain amplifying circuit, it is characterised in that the variable-gain amplifying circuit includes：
Signal amplification circuit, for being amplified to signal；
Feedback circuit, the input for the output signal of the signal amplification circuit to be fed back to the signal amplification circuit；
Variable-gain circuit, for being entered by changing gain of the resistance parameter in the feedback circuit to the signal amplification circuit
Row adjustment；
Wherein, the signal amplification circuit includes operational amplifier；
The feedback circuit includes the first electric capacity, first resistor and second resistance；The first end of first electric capacity and the second end
It is connected with the output end and inverting input of the operational amplifier respectively；The first end of first resistor and the second end respectively with institute
State output end and the inverting input connection of operational amplifier；The first end of the second resistance and the operational amplifier it is anti-
Phase input is connected；The second end ground connection of the second resistance；
The variable-gain circuit is in parallel with the second resistance；
The variable-gain circuit includes 3rd resistor, the first FET；The first end of the 3rd resistor and second electricity
The first end connection of resistance；The drain electrode end connection of the second end of the 3rd resistor and first FET；Described first
The second end connection of the source electrode of effect pipe and the second resistance；By being turned on or off for first FET, change
The actual resistance parameter of the second resistance branch road in the feedback circuit.
2. variable-gain amplifying circuit as claimed in claim 1, it is characterised in that
The variable-gain circuit also includes the second electric capacity and the 4th resistance；
The first end of second electric capacity and the second end grid respectively with first FET and first field-effect
The source electrode connection of pipe；The first end of the 4th resistance and the second end respectively with the grid of first FET and described
The source electrode connection of one FET.
3. variable-gain amplifying circuit as claimed in claim 1, it is characterised in that the variable-gain amplifying circuit is further also wrapped
Include：The grid connection of control circuit, the control circuit and first FET, for controlling first FET
Conducting and disconnection.
4. variable-gain amplifying circuit as claimed in claim 3, it is characterised in that the control circuit includes control chip；Institute
Grid of the control chip respectively with power supply, signal processor and first FET is stated to be connected.
5. variable-gain amplifying circuit as claimed in claim 1, it is characterised in that the variable-gain amplifying circuit is further also wrapped
Include filter capacitor and current-limiting resistance, first end and the power supply connection of the current-limiting resistance, the second end of the current-limiting resistance and institute
State the power end connection of operational amplifier；The second end connection of the first end of the filter capacitor and the current-limiting resistance；It is described
The second end ground connection of filter capacitor.
6. a kind of signal processing apparatus, it is characterised in that the signal processing apparatus are included as described in claim any one of 1-5
The cascade circuit of variable-gain amplifying circuit cascade composition.
7. signal processing apparatus as claimed in claim 6, it is characterised in that become described in adjacent two groups in the cascade circuit
High-frequency filter circuit is provided between gain amplifying circuit；The output end of the afterbody gain amplifying circuit of the cascade circuit
It is provided with low-frequency filter circuit.
8. signal processing apparatus as claimed in claim 7, it is characterised in that variable-gain described in described adjacent two groups amplifies electricity
Road is divided into the first variable-gain amplifying circuit and the second variable-gain amplifying circuit；
The high-frequency filter circuit includes the 6th electric capacity and the tenth resistance；The first end of the 6th electric capacity and described adjacent two
The output end connection of one group of gain amplifying circuit in the group variable-gain amplifying circuit；Second end of the 6th electric capacity and institute
State the normal phase input end connection of another group of gain amplifying circuit in variable-gain amplifying circuit described in adjacent two groups；Described tenth
The second end connection of the first end of resistance and the 6th electric capacity；The second end ground connection of the tenth resistance；
The low-frequency filter circuit includes the 3rd electric capacity and the 5th resistance；The first end of the 5th resistance and the second end respectively with
The output end connection of the output end and the cascade circuit of the afterbody gain amplifying circuit of the cascade circuit；Described 3rd
The second end connection of the first end of electric capacity and the 5th resistance；The second end ground connection of the 3rd electric capacity.
9. a kind of implementation method of variable-gain amplifying circuit, it is characterised in that the method includes：
By the resistor coupled in parallel in the feedback circuit of variable-gain circuit and signal amplification circuit；
Change the resistance parameter in the feedback circuit by the on or off of the variable-gain circuit, realize to the signal
The gain of amplifying circuit is adjusted；
Wherein, the signal amplification circuit includes operational amplifier；
The feedback circuit includes the first electric capacity, first resistor and second resistance；The first end of first electric capacity and the second end
It is connected with the output end and inverting input of the operational amplifier respectively；The first end of first resistor and the second end respectively with institute
State output end and the inverting input connection of operational amplifier；The first end of the second resistance and the operational amplifier it is anti-
Phase input is connected；The second end ground connection of the second resistance；
The variable-gain circuit is in parallel with the second resistance；
The variable-gain circuit includes 3rd resistor, the first FET；The first end of the 3rd resistor and second electricity
The first end connection of resistance；The drain electrode end connection of the second end of the 3rd resistor and first FET；Described first
The second end connection of the source electrode of effect pipe and the second resistance；By being turned on or off for first FET, change
The actual resistance parameter of the second resistance branch road in the feedback circuit.
10. the implementation method of variable-gain amplifying circuit as claimed in claim 9, it is characterised in that the variable-gain circuit
On or off is controlled by controlling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611148206.4A CN106849893A (en) | 2013-12-24 | 2013-12-24 | Variable-gain amplifying circuit and implementation method, signal processing apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721929.9A CN103731113B (en) | 2013-12-24 | 2013-12-24 | Variable gain amplifying circuit, implement method and signal processing device |
| CN201611148206.4A CN106849893A (en) | 2013-12-24 | 2013-12-24 | Variable-gain amplifying circuit and implementation method, signal processing apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310721929.9A Division CN103731113B (en) | 2013-12-24 | 2013-12-24 | Variable gain amplifying circuit, implement method and signal processing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106849893A true CN106849893A (en) | 2017-06-13 |
Family
ID=50455071
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310721929.9A Active CN103731113B (en) | 2013-12-24 | 2013-12-24 | Variable gain amplifying circuit, implement method and signal processing device |
| CN201611148206.4A Pending CN106849893A (en) | 2013-12-24 | 2013-12-24 | Variable-gain amplifying circuit and implementation method, signal processing apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310721929.9A Active CN103731113B (en) | 2013-12-24 | 2013-12-24 | Variable gain amplifying circuit, implement method and signal processing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN103731113B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110413028A (en) * | 2019-09-24 | 2019-11-05 | 山东华汇家居科技有限公司 | Environment temperature self-adapted adjustment system based on sleep physiology signal monitoring |
| CN110470987A (en) * | 2019-08-26 | 2019-11-19 | 珠海格力电器股份有限公司 | A kind of sampling parameter amplifying device, motor and its sampling parameter amplification method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110043279A1 (en) * | 2009-08-18 | 2011-02-24 | Ricoh Company, Ltd. | Electronic volume circuit |
| CN103036553A (en) * | 2012-12-10 | 2013-04-10 | 青岛歌尔声学科技有限公司 | Photoelectric signal switching circuit and plasma television stylus |
| CN203135846U (en) * | 2012-12-10 | 2013-08-14 | 青岛歌尔声学科技有限公司 | Photoelectric signaling conversion circuit and plasma television touch control pen |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557204A (en) * | 2009-05-22 | 2009-10-14 | 天津大学 | Automatic gain control circuit of multistage high dynamic range used in ultrasonic distance measurement |
| CN201667639U (en) * | 2009-09-11 | 2010-12-08 | 青岛海信电器股份有限公司 | Gain adjustable amplifying circuit and integrated circuit |
| CN102386869A (en) * | 2010-08-27 | 2012-03-21 | 杭州中科微电子有限公司 | Analog/digital configurable variable-gain amplifier |
| CN203761342U (en) * | 2013-12-24 | 2014-08-06 | 青岛歌尔声学科技有限公司 | Variable gain amplification circuit and signal processing device |
-
2013
- 2013-12-24 CN CN201310721929.9A patent/CN103731113B/en active Active
- 2013-12-24 CN CN201611148206.4A patent/CN106849893A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110043279A1 (en) * | 2009-08-18 | 2011-02-24 | Ricoh Company, Ltd. | Electronic volume circuit |
| CN103036553A (en) * | 2012-12-10 | 2013-04-10 | 青岛歌尔声学科技有限公司 | Photoelectric signal switching circuit and plasma television stylus |
| CN203135846U (en) * | 2012-12-10 | 2013-08-14 | 青岛歌尔声学科技有限公司 | Photoelectric signaling conversion circuit and plasma television touch control pen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470987A (en) * | 2019-08-26 | 2019-11-19 | 珠海格力电器股份有限公司 | A kind of sampling parameter amplifying device, motor and its sampling parameter amplification method |
| CN110413028A (en) * | 2019-09-24 | 2019-11-05 | 山东华汇家居科技有限公司 | Environment temperature self-adapted adjustment system based on sleep physiology signal monitoring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103731113B (en) | 2017-01-25 |
| CN103731113A (en) | 2014-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105099171B (en) | A kind of compensation network, switching power circuit and circuit compensation method | |
| CN103023440A (en) | Circuit for improving linearity of power amplifier | |
| CN204031079U (en) | A kind of signal amplifies and power amplification circuit | |
| CN109067370A (en) | Electronic data signals processing circuit | |
| CN104333333B (en) | A kind of single-ended amplifier and its noise cancellation method | |
| CN105356855B (en) | A kind of adjustable distributed amplifier circuit | |
| CN207543126U (en) | Computer networks integration device | |
| CN106849893A (en) | Variable-gain amplifying circuit and implementation method, signal processing apparatus | |
| CN203761342U (en) | Variable gain amplification circuit and signal processing device | |
| JP2007336534A (en) | Single stage balanced voltage amplifier | |
| CN107453712A (en) | D convertor circuit | |
| US6057737A (en) | Non-linear asymmetrical audio amplifiers | |
| CN109327198A (en) | More collapsible cascodes of feedback control loop instrument | |
| CN104682946B (en) | A kind of differential signal turns single-ended signal circuit | |
| CN104184425B (en) | The D-type audio power amplifier of single ended input | |
| CN208401808U (en) | A kind of low-frequency electronic communication system | |
| CN203912166U (en) | Active band stop filter circuit | |
| CN104104340B (en) | A kind of radio-frequency power amplifier | |
| CN205596312U (en) | Microphone amplifier circuit and electronic equipment | |
| CN207339799U (en) | A kind of F power-like amplifiers with negative feedback structure | |
| CN207732737U (en) | A kind of multi-path power divider device for aviation monitoring | |
| CN207283503U (en) | Bidirectional current adapter power amplifier biasing circuit | |
| CN206728280U (en) | A kind of binaural sound amplifying circuit | |
| CN104053094B (en) | A kind of active rejector circuit | |
| CN102710226B (en) | Power amplifying device |
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: 20170613 |
|
| RJ01 | Rejection of invention patent application after publication |