CN203537332U - Power source sampled signal amplifying circuit - Google Patents
Power source sampled signal amplifying circuit Download PDFInfo
- Publication number
- CN203537332U CN203537332U CN201320572161.9U CN201320572161U CN203537332U CN 203537332 U CN203537332 U CN 203537332U CN 201320572161 U CN201320572161 U CN 201320572161U CN 203537332 U CN203537332 U CN 203537332U
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- Prior art keywords
- resistor
- capacitor
- operational amplifier
- input end
- amplifying circuit
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- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000005070 sampling Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
A power source sampled signal amplifying circuit is characterized in that the amplifying circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor and a work power source; the first resistor and the second resistor are connected with the negative input end and the positive input end of the operational amplifier respectively, the third resistor is connected between the negative input end and the output end of the operational amplifier, the work power source is connected with the fifth resistor and the fourth resistor and then is grounded, a voltage dividing point of the fifth resistor and the voltage dividing point of the fourth resistor are connected with the positive input end of the operational amplifier, the sixth resistor is connected with to the output end of the operational amplifier, the first capacitor is connected in parallel to the two ends of the third resistor, the second capacitor is connected between the positive input end of the operational amplifier and the ground, and the third capacitor is connected between the output end of the operational amplifier and the ground.
Description
Technical Field
The utility model belongs to the technical field of the circuit, a power sampling signal amplifier circuit is related to, is applicable to the enlargies or dwindles to direct current signal and low frequency alternating current signal, is particularly useful for the enlargies of small signal.
Background
Differential amplifier circuits have very high common mode rejection capability and are therefore a very important basic circuit in analog electronics. The differential operational amplifier circuit is widely applied due to the very high integration level and the simple peripheral design. The traditional differential operational amplifier circuit is affected by offset voltage of an operational amplifier (operational amplifier), gain bandwidth and the like, and cannot obtain good linearity when amplifying small signals.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve prior art not enough, designed a take biased difference amplifier circuit, increased a fixed DC bias voltage on traditional difference amplifier circuit's basis to offset the influence that operation offset voltage isoparametric brought the circuit, had very good linearity.
The utility model discloses a technical scheme be, a power sampling signal amplifier circuit, the key is: the amplifying circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor and a working power supply, wherein the first resistor and the second resistor are respectively connected to the negative input end and the positive input end of the operational amplifier, the third resistor is connected between the negative input end and the output end of the operational amplifier, the working power supply is sequentially connected with the fifth resistor and the fourth resistor and then connected to the ground, the voltage division point of the fifth resistor and the fourth resistor is connected to the positive input end of the operational amplifier, the sixth resistor is connected to the output end of the operational amplifier, the first capacitor is connected to two ends of the third resistor in parallel, the second capacitor is connected between the positive input end of the operational amplifier and the ground, and the third capacitor is connected between the output end of the operational amplifier and the ground.
The resistance values of the first resistor and the second resistor are equal.
The resistance value of the third resistor is equal to the parallel equivalent resistance value of the fourth resistor and the fifth resistor.
The capacitance values of the first capacitor and the second capacitor are equal.
The utility model discloses the circuit has simple structure, and the magnification is high, and the linearity is good, can carry out signal amplification simultaneously or reduce advantages such as. The basic form of the circuit is that on the basis of a differential amplification circuit, a fixed bias voltage is added to the positive input end of an operational amplifier, and when the bias voltage is larger than the product of the input offset voltage of the operational amplifier and the amplification factor of the circuit, the circuit has very high linearity.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
B represents an operational amplifier, R1-R6 represent resistors, C1-C3 represent capacitors, and VCC represents a working power supply.
Detailed Description
A power supply sampling signal amplifying circuit comprises an operational amplifier B, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a working power supply VCC, wherein the first resistor R1 and the second resistor R2 are respectively connected with the negative input end and the positive input end of the operational amplifier B, the third resistor R3 is connected between the negative input end and the output end of the operational amplifier B, the working power supply VCC is sequentially connected with the fifth resistor R5 and the fourth resistor R4 and then grounded, the partial pressure points of the fifth resistor R5 and the fourth resistor R4 are connected with the positive input end of the operational amplifier B, the sixth resistor R6 is connected with the output end of the operational amplifier B, the first capacitor C1 is connected with two ends of the third resistor R3 in parallel, and the second capacitor C2 is connected between the positive input end of the operational amplifier B and the ground, the third capacitor C3 is connected between the output of the operational amplifier B and ground.
The resistance values of the first resistor R1 and the second resistor R2 are equal.
The resistance value of the third resistor R3 is equal to the parallel equivalent resistance value of the fourth resistor R4 and the fifth resistor R5.
The capacitance values of the first capacitor C1 and the second capacitor C2 are equal.
The utility model discloses a circuit will normally work, needs to satisfy the difference and matches the principle. Namely, it is，
，
. The circuit can amplify and reduce an alternating current signal or a direct current signal. When an ac signal is amplified or reduced, an operational amplifier having an appropriate bandwidth needs to be selected according to the frequency of the ac signal. The first capacitor C1 in the circuit is used to compensate the operational amplifier, which is equivalent to adding a zero pole in the circuit to increase the bandwidth of the circuit. The first capacitor C1 is usually selected to be between 10-1000 pF, the size of the capacitor is determined according to the frequency of the input and output signals, if the direct current signal is processed, the first capacitor C1 is usually selected to be between 500-1000 pF, if the alternating current small signal is processed, the first capacitor C1 is usually selected to be between tens of picofarads and hundreds of picofarads. The higher the frequency the smaller the capacitance. The sixth resistor R6 and the third capacitor C3 form a low-pass filter. The values of the sixth resistor R6 and the third capacitor C3 may be determined according to actual use conditions.
Setting of bias voltage:
is set by the offset voltage of the operational amplifier
And circuit amplification factor
The influence of (c).
；
Calculating conditions:
wherein,
: represents a bias voltage;
: represents the output of the circuit;
: represents the positive terminal input of the circuit;: represents the negative terminal input of the circuit;
: representing a fixed dc voltage.
Claims (4)
1. A kind of power samples the signal amplification circuit, characterized by that: the amplifying circuit comprises an operational amplifier (B), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3) and a working power supply (VCC), wherein the first resistor (R1) and the second resistor (R2) are respectively connected with the negative input end and the positive input end of the operational amplifier (B), the third resistor (R3) is connected between the negative input end and the output end of the operational amplifier (B), the working power supply (VCC) is sequentially connected with the fifth resistor (R5) and the fourth resistor (R4) and then is grounded, the partial pressure points of the fifth resistor (R5) and the fourth resistor (R4) are connected with the positive input end of the operational amplifier (B), and the sixth resistor (R6) is connected with the output end of the operational amplifier (B), the first capacitor (C1) is connected in parallel to two ends of the third resistor (R3), the second capacitor (C2) is connected between the positive input end of the operational amplifier (B) and the ground, and the third capacitor (C3) is connected between the output end of the operational amplifier (B) and the ground.
2. The power supply sampling signal amplifying circuit according to claim 1, wherein: the first resistor (R1) and the second resistor (R2) have the same resistance value.
3. The power supply sampling signal amplifying circuit according to claim 1, wherein: the resistance value of the third resistor (R3) is equal to the parallel equivalent resistance value of the fourth resistor (R4) and the fifth resistor (R5).
4. The power supply sampling signal amplifying circuit according to claim 1, wherein: the capacitance values of the first capacitor (C1) and the second capacitor (C2) are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320572161.9U CN203537332U (en) | 2013-09-16 | 2013-09-16 | Power source sampled signal amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320572161.9U CN203537332U (en) | 2013-09-16 | 2013-09-16 | Power source sampled signal amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537332U true CN203537332U (en) | 2014-04-09 |
Family
ID=50423503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320572161.9U Expired - Lifetime CN203537332U (en) | 2013-09-16 | 2013-09-16 | Power source sampled signal amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203537332U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883137A (en) * | 2015-06-15 | 2015-09-02 | 河南师范大学 | Integrated operational amplifying circuit capable of increasing bandwidth to short-wave frequency band and reducing noise |
| CN106230430A (en) * | 2016-07-27 | 2016-12-14 | 上海航天设备制造总厂 | Power electronic equipment with N road without electric contact signaling conversion circuit |
| CN106373293A (en) * | 2016-08-31 | 2017-02-01 | 广州御银自动柜员机科技有限公司 | Pre-reading magnetic stripe module |
| CN107782912A (en) * | 2017-10-23 | 2018-03-09 | 安徽容知日新科技股份有限公司 | A kind of piezoelectric acceleration transducer |
| CN110265964A (en) * | 2019-06-29 | 2019-09-20 | 浙江大学 | Integrated SiC MOSFET module overcurrent and short circuit protection circuit based on tunneling magnetoresistance |
| CN115389438A (en) * | 2022-10-26 | 2022-11-25 | 杭州泽天春来科技有限公司 | Spectrum appearance |
-
2013
- 2013-09-16 CN CN201320572161.9U patent/CN203537332U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883137A (en) * | 2015-06-15 | 2015-09-02 | 河南师范大学 | Integrated operational amplifying circuit capable of increasing bandwidth to short-wave frequency band and reducing noise |
| CN106230430A (en) * | 2016-07-27 | 2016-12-14 | 上海航天设备制造总厂 | Power electronic equipment with N road without electric contact signaling conversion circuit |
| CN106373293A (en) * | 2016-08-31 | 2017-02-01 | 广州御银自动柜员机科技有限公司 | Pre-reading magnetic stripe module |
| CN107782912A (en) * | 2017-10-23 | 2018-03-09 | 安徽容知日新科技股份有限公司 | A kind of piezoelectric acceleration transducer |
| CN110265964A (en) * | 2019-06-29 | 2019-09-20 | 浙江大学 | Integrated SiC MOSFET module overcurrent and short circuit protection circuit based on tunneling magnetoresistance |
| CN115389438A (en) * | 2022-10-26 | 2022-11-25 | 杭州泽天春来科技有限公司 | Spectrum appearance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |
|
| CX01 | Expiry of patent term |