CN106529344A - Control circuit for reducing DC gain of internal module of computer - Google Patents
Control circuit for reducing DC gain of internal module of computer Download PDFInfo
- Publication number
- CN106529344A CN106529344A CN201611138210.2A CN201611138210A CN106529344A CN 106529344 A CN106529344 A CN 106529344A CN 201611138210 A CN201611138210 A CN 201611138210A CN 106529344 A CN106529344 A CN 106529344A
- Authority
- CN
- China
- Prior art keywords
- resistance
- diode
- electric capacity
- amplifier
- control circuit
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
-
- 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
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
Abstract
The invention discloses a control circuit for reducing DC gain of an internal module of a computer. The control circuit comprises a diode D1, a capacitor C1, a resistor R1, an operational amplifier U1, a capacitor C2 and a resistor R2, wherein one end of the capacitor C2 is respectively connected to one end of alternating current Ui, a resistor R5 and a cathode of the diode D2 and the other end of the capacitor C2 is respectively connected to the resistor R2, an anode of the diode D2 and a non-inverting terminal of the operational amplifier U1; an inverting terminal of the operational amplifier U1 is respectively connected to the resistor R1 and a resistor R3; and the other end of the resistor R1 is connected to the capacitor C1. The control circuit adopts design of the single operational amplifier U1 and introduces DC complete feedback and AC partial feedback, when the AC voltage gain is larger, the DC voltage gain is very small, so that the saturation of the operational amplifier due to input offset current is avoided, and furthermore, the voltage stabilizing diode D1 is arranged to clamp the maximal amplitude of the voltage at the output end in order to suppress the DC offset.
Description
Technical field
The present invention relates to a kind of control circuit, specifically a kind of control electricity for reducing computer-internal module DC current gain
Road.
Background technology
Amplifier is the circuit unit that an angle from function is named, and can be realized by discrete device, it is also possible to realize
In the middle of semiconductor chip.With the development of semiconductor technology, most amplifier is in the form of single-chip.Amplifier
Species is various, is widely used in the middle of electron trade.
The species of amplifier is various, is widely used in the middle of almost all of industry.For example computer, computer-internal circuit
Modular structure is complicated, and having for the amplifier of employing is a lot, wherein many amplifiers are used as AC amplifier, but, in computer
In portion's module, the AC signal being amplified much is needed to contain very big direct current harmonic wave, existing processing mode is adopted mostly
Solved with the mode of filtering, but the improper phenomenon for having easily caused direct current offset of filtering to direct current signal.
The content of the invention
It is an object of the invention to provide a kind of control circuit for reducing computer-internal module DC current gain, with solution
The problem proposed in stating background technology.
For achieving the above object, the present invention provides following technical scheme：
It is a kind of reduce computer-internal module DC current gain control circuit, including diode D1, electric capacity C1, resistance R1,
Amplifier U1, electric capacity C2 and resistance R2, described electric capacity C2 one end connect alternating current Ui one end, resistance R5 and diode D2 respectively and bear
Pole, the electric capacity C2 other ends connect resistance R2, diode D2 positive poles and amplifier U1 in-phase end respectively, and amplifier U1 end of oppisite phase connects respectively
Resistance R1 and resistance R3, the resistance R1 other end connects electric capacity C1, and the electric capacity C1 other ends connect diode D1 positive poles, resistance R2 respectively
The other end, the resistance R5 other ends and the alternating current Ui other ends are simultaneously grounded, diode D1 negative poles connect respectively the resistance R3 other ends and
Resistance R4, the resistance R4 other end connects amplifier U1 output end and electric capacity C3, electric capacity C3 other ends connection output end vo respectively.
As further scheme of the invention：The diode D1 is Zener diode.
As further scheme of the invention：The amplifier U1 power end connects power supply+V, the connection of amplifier U1 earth terminal
Power supply-V, power supply+V and power supply-V are equal in magnitude, in opposite direction.
Compared with prior art, the invention has the beneficial effects as follows：The present invention is introduced direct current and is all-trans using single amplifier U1 design
Feedback and AC portion feedback, can make DC voltage gain drop to very little when alternating voltage gain is larger, defeated so as to avoid
Enter the saturation that offset current causes amplifier, and arrange Zener diode D1 carries out clamper to output end voltage maximum amplitude, suppression
Direct current offset is made.
Description of the drawings
Fig. 1 is the circuit diagram of the control circuit for reducing computer-internal module DC current gain.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.
Fig. 1 is referred to, in the embodiment of the present invention, a kind of control circuit for reducing computer-internal module DC current gain, bag
Diode D1, electric capacity C1, resistance R1, amplifier U1, electric capacity C2 and resistance R2 are included, described electric capacity C2 one end connects alternating current Ui respectively
One end, resistance R5 and diode D2 negative poles, the electric capacity C2 other ends connect resistance R2, diode D2 positive poles and amplifier U1 homophase respectively
End, amplifier U1 end of oppisite phase connect resistance R1 and resistance R3, resistance R1 other ends connection electric capacity C1, electric capacity C1 other ends difference respectively
Connection diode D1 positive poles, the resistance R2 other ends, the resistance R5 other ends and the alternating current Ui other ends are simultaneously grounded, diode D1 negative poles
Connect the resistance R3 other ends respectively and resistance R4, the resistance R4 other end connects amplifier U1 output end and electric capacity C3, electric capacity C3 respectively
The other end connects output end vo；The diode D1 is Zener diode；The amplifier U1 power end connects power supply+V, amplifier U1
Connection power supply-V, power supply+V and power supply-V are equal in magnitude for earth terminal, in opposite direction.
Circuit is built according to Fig. 1, in circuit, electric capacity C2 and C3 are input and output coupling capacitor；R2 makes amplifier U1 homophase
Input forms DC channel, and internal difference is in control necessary input bias current；Resistance R3 introduces direct current and exchanges negative
Feedback, and make integrated transporting discharging U1 inverting inputs form DC channel, internal difference is in control necessary input bias current；
Due to electric capacity C1 stopping direct currents, direct current is made to form unity feedback, exchange is shunted by R1 and C1, is formed AC portion feedback, is voltage
Series negative feedback, after introducing direct current unity feedback and AC portion feedback, can make direct current when alternating voltage gain is larger
Pressure gain very little, so as to avoid input offset current from causing the saturation of amplifier；The effect for arranging resistance R5 is to improve input impedance,
DC voltage gain is further reduced, the effect of Zener diode D1 is that clamper is carried out to output end voltage maximum amplitude, suppressed
Direct current offset.
In sum, the present invention introduces direct current unity feedback and AC portion feedback using single amplifier U1 design, can be in exchange
When voltage gain is larger, DC voltage gain can be made to drop to very little, so as to avoid input offset current from causing the saturation of amplifier,
And arranging Zener diode D1 carries out clamper to output end voltage maximum amplitude, it is suppressed that direct current offset.
Claims (3)
1. a kind of control circuit for reducing computer-internal module DC current gain, including diode D1, electric capacity C1, resistance R1, fortune
Put U1, electric capacity C2 and resistance R2, it is characterised in that described electric capacity C2 one end connects alternating current Ui one end, resistance R5 and two respectively
Pole pipe D2 negative pole, the electric capacity C2 other ends connect resistance R2, diode D2 positive poles and amplifier U1 in-phase end, amplifier U1 end of oppisite phase respectively
Connect resistance R1 and resistance R3 respectively, resistance R1 other ends connection electric capacity C1, the electric capacity C1 other ends are just connecting diode D1 respectively
Pole, the resistance R2 other ends, the resistance R5 other ends and the alternating current Ui other ends are simultaneously grounded, and diode D1 negative poles connect resistance R3 respectively
The other end and resistance R4, the resistance R4 other ends connect amplifier U1 output end and electric capacity C3, the connection output of the electric capacity C3 other ends respectively
End Vo, the diode D1 are Zener diode, the amplifier U1 power end connection power supply+V.
2. it is according to claim 1 reduce computer-internal module DC current gain control circuit, it is characterised in that amplifier
U1 earth terminals connect power supply-V.
3. it is according to claim 1 and 2 reduce computer-internal module DC current gain control circuit, it is characterised in that
Power supply+V and power supply-V are equal in magnitude, in opposite direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611138210.2A CN106529344A (en) | 2016-12-12 | 2016-12-12 | Control circuit for reducing DC gain of internal module of computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611138210.2A CN106529344A (en) | 2016-12-12 | 2016-12-12 | Control circuit for reducing DC gain of internal module of computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106529344A true CN106529344A (en) | 2017-03-22 |
Family
ID=58343082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611138210.2A Withdrawn CN106529344A (en) | 2016-12-12 | 2016-12-12 | Control circuit for reducing DC gain of internal module of computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106529344A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112336448A (en) * | 2020-11-05 | 2021-02-09 | 单纯玉 | Irreversible electroporation circuit and irreversible electroporation apparatus for heart |
-
2016
- 2016-12-12 CN CN201611138210.2A patent/CN106529344A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112336448A (en) * | 2020-11-05 | 2021-02-09 | 单纯玉 | Irreversible electroporation circuit and irreversible electroporation apparatus for heart |
| CN112336448B (en) * | 2020-11-05 | 2021-12-28 | 上海倍可达医疗科技有限公司 | Irreversible electroporation circuit and irreversible electroporation apparatus for heart |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170322 |