CN207410306U - A kind of alternating current-direct current signal distinguishes amplifying circuit - Google Patents
A kind of alternating current-direct current signal distinguishes amplifying circuit Download PDFInfo
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- CN207410306U CN207410306U CN201721261716.2U CN201721261716U CN207410306U CN 207410306 U CN207410306 U CN 207410306U CN 201721261716 U CN201721261716 U CN 201721261716U CN 207410306 U CN207410306 U CN 207410306U
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Abstract
The utility model provides a kind of alternating current-direct current signal difference amplifying circuit, comprising operational amplifier, also comprising DC bias circuit, amplification factor adjustment unit, capacitance-resistance feedback network, filter circuit, ground capacity, direct current signal input circuit and AC signal input circuit；Direct current signal input circuit, AC signal input circuit are respectively as DC signal source, alternating message source, and integrated connection is connected in parallel between the in-phase input end of operational amplifier and inverting input after being connected in series；DC bias circuit is connected with the in-phase input end of operational amplifier；Capacitance-resistance feedback network is containing capacitive branch and resistance branch in parallel, capacitance-resistance feedback network is integrally attached between the output terminal of operational amplifier and its inverting input, and the inverting input of operational amplifier has also been linked in sequence amplification factor adjustment unit, ground capacity to ground terminal；The utility model has the advantages that the Hybrid amplifier of AC signal and direct current signal, and each amplification factor is adjustable.
Description
Technical field
The utility model is related to electronic fields, and in particular to a kind of alternating current-direct current signal distinguishes amplifying circuit.
Background technology
In variable-frequency power sources, since the null offset of operational amplifier, switching tube are in itself in control circuit and its driving is electric
The factors such as road is inconsistent cause electric power output voltage to generate DC component.However in output terminal amplifier circuit, usually all
Need to do the alternating voltage and DC component of sampling respectively the amplification of different multiples, to realize closed-loop control.
In current design, the design to the signal of acquisition is：AC signal is realized with two amplifying circuits respectively
With the independent amplification of direct current signal；Or in same amplifying circuit in the case where having AC signal and direct current signal input,
Equal fixed multiple can only be amplified to the alternating current-direct current signal, it is impossible to while realize the amplification respectively to alternating current-direct current signal.
So for the integrated of circuit, the usage amount of component is reduced, reduces pcb board effective area, expanded circuit
Using compatible scope, it is necessary to which AC signal and direct current signal are amplified simultaneously for a kind of realization and amplification factor is different or even divides
An amplifying circuit of adjustable AC signal and direct current signal amplification factor is not controlled.
Utility model content
For the deficiency in the presence of the prior art, the utility model provides a kind of alternating current-direct current signal difference amplification electricity
Road, its object is to realize AC signal and the difference amplification of direct current signal different amplification.
To achieve the above object, the utility model employs following technical solution：
A kind of alternating current-direct current signal distinguishes amplifying circuit, comprising operational amplifier, also comprising DC bias circuit, amplification factor
Adjustment unit, capacitance-resistance feedback network, filter circuit, ground capacity, direct current signal input circuit and AC signal input circuit；
Wherein direct current signal input circuit, AC signal input circuit are respectively as DC signal source, alternating message source, string
Connection is whole again after connecting to be connected in parallel between the in-phase input end of operational amplifier and inverting input；
DC bias circuit is connected with the in-phase input end of operational amplifier；
The capacitance-resistance feedback network includes at least one capacitive branch and a resistance branch, and capacitive branch and resistance branch
Road is parallel with one another；
Capacitance-resistance feedback network is integrally attached between the output terminal of operational amplifier and its inverting input, operational amplifier
Inverting input be also linked in sequence amplification factor adjustment unit, ground capacity to reference ground.
The utility model utilizes AC signal and direct current signal corresponding Equivalent conjunction access, equivalent appearance at different frequencies
Anti- or impedance difference is realized initial to the direct current of the size of direct current signal, AC DC mixed signal by DC bias circuit
Constant is adjusted, by operational amplifier, the capacitance-resistance feedback network comprising resistance branch and capacitive branch and amplification factor adjustment unit
Establish different amplification signal amplification circuit.
Compared with the prior art, the utility model meets while to the amplification of AC signal and direct current signal, and amplifies
Multiple can be adjusted freely according to actual needs, solved the difficulty in layout due to after reduction pcb board size, bringing, reduced
The usage quantity of operational amplifier.In similar product, competitive advantage is enhanced, is highly suitable for AC signal and direct current letter
Number mixing sampling application in.
Description of the drawings
Fig. 1 is that the alternating current-direct current signal in embodiment distinguishes amplifying circuit principle schematic.
Fig. 2 is resistance switching circuit principle schematic in embodiment.
Specific embodiment
The technical solution in the utility model is further illustrated with reference to the accompanying drawings and embodiments.
A kind of alternating current-direct current signal distinguishes amplifying circuit, as shown in Figure 1, comprising operational amplifier U1, also comprising direct current biasing
Circuit, amplification factor adjustment unit, capacitance-resistance feedback network, filter circuit, ground capacity, direct current signal input circuit are with exchanging letter
Number input circuit；
Wherein direct current signal input circuit, AC signal input circuit are respectively as DC signal source DC1, alternating message source
AC1, it is whole again after being connected in series to be connected in parallel between the in-phase input end and inverting input of operational amplifier U1；
DC bias circuit includes DC source DC2, and operation amplifier is connected to by current-limiting resistance R1, current-limiting resistance R2
The in-phase input end of device U1, wherein current-limiting resistance R2 are parallel with capacitance C2；By current-limiting resistance R1 and current-limiting resistance R2 reduce by
DC source DC2 flows to the electric current of the direct current signal input circuit as DC signal source DC1.
The filter circuit includes the filter resistance R6 and filter capacitor C5 being connected in series to reference ground, to filter out amplification
The clutter included after AC signal；
The capacitance-resistance feedback network includes at least one capacitive branch and a resistance branch, and capacitive branch and resistance branch
Road is parallel with one another；The resistance branch includes resistance R4, the resistance R5 being connected in series, wherein, resistance R5 is also parallel with capacitance C3；
Capacitive branch includes capacitance C4, and wherein resistance R4, resistance R5 are whole in parallel with capacitance C4 after being connected in series；
Capacitance-resistance feedback network is integrally attached between the output terminal of operational amplifier U1 and its inverting input, operation amplifier
The inverting input of device U1 has also been linked in sequence amplification factor adjustment unit, wherein ground capacity C1 to reference ground, times magnification
Number adjustment unit includes amplification factor and adjusts resistance R3, in pc equivalent circuit and ac equivalent circuit, due to signal frequency
It is different so that the capacitive reactance or impedance of capacitance-resistance feedback network also differ, and amplification factor calculation is amplified with in-phase amplification circuit
Multiple calculation is identical, and the equivalent capacitive reactance/equiva lent impedance of feedback circuit and the ratio of amplification factor adjustment resistance R3 are positively correlated with
The AC signal amplification factor of amplifying circuit and direct current signal amplification factor；Further, since the connection of ground capacity C1, amplification electricity
Direct-flow input signal and ac input signal are only amplified in road, without amplifying DC offset voltage.
Wherein one or more in capacitance-resistance feedback network, amplification factor adjustment unit, DC bias circuit also include
There are resistance switching circuit and/or capacitance switching circuit；The resistance switching circuit includes multiple resistance and resistance switching switch, leads to
The switch motion for crossing resistance switching switch changes the equivalent resistance size of resistance switching circuit entirety；The capacitance switching circuit bag
Containing multiple capacitances and capacitance switching switch, the equivalent of capacitance switching circuit entirety is changed by the switch motion of capacitance switching switch
Capacitance size；Its principle of work and power is more similar with connection mode with capacitance switching circuit for resistance switching circuit, and Fig. 2 is a kind of resistance
The connection mode of switching circuit, as shown in Fig. 2, resistance switching circuit includes resistance R7, resistance R8 and switching switch K1, resistance R7
It is whole in parallel with resistance R8 after connecting with switching switch K1；By resistance switching circuit be placed in resistance R4 in resistance branch, resistance R5,
Amplification factor adjusts one of them of resistance R3 or is placed in relevant position simultaneously, passes through the i.e. controllable direct current signal of combination, exchange
The change of signal different amplification.
Resistance switching switch described in the present embodiment, capacitance switching switch are using analog switch, the control of analog switch
End is connected with control circuit.Analog switch is integrated switch, and small volume uses convenient for control, also allows for patch production, without
Use the plug-in elements such as relay.When considering to reduce switch resistance or leave larger PCB surface product, it is possible to use signal relay
Device.
Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, it can be to this
The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model
It encloses, should all cover among the right of the utility model.
Claims (6)
1. a kind of alternating current-direct current signal distinguishes amplifying circuit, operational amplifier is included, it is characterised in that：Also comprising direct current biasing electricity
Road, amplification factor adjustment unit, capacitance-resistance feedback network, filter circuit, ground capacity, direct current signal input circuit and AC signal
Input circuit；
Wherein direct current signal input circuit, AC signal input circuit are respectively as DC signal source, alternating message source, phase of connecting
It is whole again after connecing to be connected in parallel between the in-phase input end of operational amplifier and inverting input；
DC bias circuit is connected with the in-phase input end of operational amplifier；
The capacitance-resistance feedback network includes at least one capacitive branch and a resistance branch, and capacitive branch and resistance branch phase
It is mutually in parallel；
Capacitance-resistance feedback network is integrally attached between the output terminal of operational amplifier and its inverting input, operational amplifier it is anti-
Phase input terminal has also been linked in sequence amplification factor adjustment unit, ground capacity to reference ground.
2. a kind of alternating current-direct current signal difference amplifying circuit as described in claim 1, it is characterised in that：The DC bias circuit
Include the current-limiting resistance for being connected to operational amplifier noninverting input.
3. a kind of alternating current-direct current signal difference amplifying circuit as described in claim 1, it is characterised in that：In capacitance-resistance feedback network
In, the capacitive branch includes a capacitance or at least two capacitances being connected in series；The resistance branch includes a resistance
Or at least two resistance being connected in series；In the resistance branch comprising at least two resistance, any resistance or electricity is also parallel with
Hold；In the capacitive branch comprising at least two capacitances, any capacitance or resistance is also parallel with.
4. a kind of alternating current-direct current signal difference amplifying circuit as described in any one of claims 1 to 3, it is characterised in that：In capacitance-resistance
Wherein one or more in feedback network, amplification factor adjustment unit, DC bias circuit also include resistance switching circuit
And/or capacitance switching circuit；The resistance switching circuit includes multiple resistance and resistance switching switch, passes through resistance switching switch
Switch motion change resistance switching circuit entirety equivalent resistance size；The capacitance switching circuit includes multiple capacitances and electricity
Hold switching switch, the equivalent capacity size of capacitance switching circuit entirety is changed by the switch motion of capacitance switching switch.
5. a kind of alternating current-direct current signal difference amplifying circuit as claimed in claim 4, it is characterised in that：The resistance switching is opened
It closes, capacitance switching switch is using analog switch or signal relay, the control terminal and control of analog switch or signal relay
Circuit is connected.
6. a kind of alternating current-direct current signal difference amplifying circuit as described in claim 1, it is characterised in that：The filter circuit includes
It is connected in series to the filter resistance and filter capacitor of reference ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721261716.2U CN207410306U (en) | 2017-09-28 | 2017-09-28 | A kind of alternating current-direct current signal distinguishes amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721261716.2U CN207410306U (en) | 2017-09-28 | 2017-09-28 | A kind of alternating current-direct current signal distinguishes amplifying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207410306U true CN207410306U (en) | 2018-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721261716.2U Active CN207410306U (en) | 2017-09-28 | 2017-09-28 | A kind of alternating current-direct current signal distinguishes amplifying circuit |
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| CN (1) | CN207410306U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702978A (en) * | 2019-11-05 | 2020-01-17 | 中电科仪器仪表有限公司 | Device and method for measuring direct current bias voltage on small signal |
| CN113630688A (en) * | 2021-08-05 | 2021-11-09 | 东莞凯韵科技有限公司 | Direct current servo circuit |
-
2017
- 2017-09-28 CN CN201721261716.2U patent/CN207410306U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702978A (en) * | 2019-11-05 | 2020-01-17 | 中电科仪器仪表有限公司 | Device and method for measuring direct current bias voltage on small signal |
| CN113630688A (en) * | 2021-08-05 | 2021-11-09 | 东莞凯韵科技有限公司 | Direct current servo circuit |
| CN113630688B (en) * | 2021-08-05 | 2024-05-17 | 东莞凯韵科技有限公司 | Direct current servo circuit |
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