CN202918246U - Preposed charge amplifier with low noise - Google Patents
Preposed charge amplifier with low noise Download PDFInfo
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- CN202918246U CN202918246U CN 201220576081 CN201220576081U CN202918246U CN 202918246 U CN202918246 U CN 202918246U CN 201220576081 CN201220576081 CN 201220576081 CN 201220576081 U CN201220576081 U CN 201220576081U CN 202918246 U CN202918246 U CN 202918246U
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- feedback
- voltage
- resistance
- low noise
- operational amplifier
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Abstract
The utility model relates to a preposed charge amplifier with low noise. The preposed charge amplifier with low noise comprises a feedback module, an operational amplifier, a voltage stabilization protection module and a feedback filter resistance. The feedback module is connected to a place which is between a negative input end and an output end of the operational amplifier and is used for forming a feedback loop. One end of the voltage stabilization protection module and one end of the feedback filter resistance are respectively connected with the negative input end of the operational amplifier and are used for filtering noise of an input signal and carrying out voltage stabilization and protection of a circuit. The other end of the voltage stabilization protection module is connected with a power supply and the other end of the feedback filter resistance is connected with a signal input end and is used for providing power for the voltage stabilization protection module. The preposed charge amplifier with low noise can shift a charge signal into a corresponding voltage signal and has the advantages of being high in impedance, low in noise, low in drifting and high in gains. Even if a changed cable distributed capacitance can not affect measuring results, thus facilitating subsequent amplification and processing.
Description
Technical field
The utility model relates to a kind of charge amplifier, particularly the preposition charge amplifier of a kind of low noise.
Background technology
Prior art has been applied to detect the slewing vibration monitor system, and its exemplary operation mode is that its actual content of shunt voltage amplifier formula integrator that uses operational amplifier to form is a kind of " charge voltage transducer ".The technological difficulties that charge amplifier design exists mainly contain three aspects: the transducer aspect, the operational amplifier aspect, feedback capacity choose the aspect.
The Sensor section output signal is less, the frequency range of transducer is very large.The high transducer low frequency of precision can be accomplished 0.00001Hz. near direct current now, and high frequency can arrive 1.2KHz, and is very high to the response frequency requirement of amplifier.Simultaneously during low frequency, the signal amplitude of output is less, and signal is very faint.
The operational amplifier aspect: the feedback resistance of charge amplifier is very large, usually more than 150M Europe.To have very low bias current and the very high input impedance to the requirement of operational amplifier then.If make the extraordinary charge amplifier of frequency response, feedback resistance is usually more than 1G, even other bias current of nA level also can produce the above bias voltage of number V.
Feedback capacity choose the aspect: charge amplifier is a degenerative high-gain amplifier of the degree of depth.Require feedback capacity to have time and the good contour performance of temperature stability.Therefore, that development is applicable to is that engineering site is used, simply, the good charge amplifier of low frequency characteristic cheaply, just become the difficult problem of a long-term puzzlement engineering practice in order to realize real broad band charge amplifier.
The utility model content
Technical problem to be solved in the utility model provides a kind of high impedance, low noise, low drift, the preposition charge amplifier of the low noise of high-gain.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: the preposition charge amplifier of a kind of low noise, comprise feedback module, operational amplifier, voltage-stabilizing protection module and feedback filtering resistance, described feedback module is connected between the negative input end and output of described operational amplifier, is used for consisting of feedback loop;
One end of described voltage-stabilizing protection module is connected with the negative input end of described operational amplifier respectively with an end of described feedback filtering resistance, is used for input signal is carried out filtering noise and circuit is carried out voltage-stabilizing protection;
The other end of described voltage-stabilizing protection module is connected with power supply, and the other end of described feedback filtering resistance and signal input part are used to the voltage-stabilizing protection module for power supply.
The beneficial effects of the utility model are: feedback filtering resistance is set in circuit, can the filtering input noise, and feedback module is set, realized high-gain.
On the basis of technique scheme, the utility model can also be done following improvement.
Further, described voltage-stabilizing protection module comprises two voltage stabilizing didoes;
The positive pole of a voltage stabilizing didoe is connected with the negative link of operational amplifier, and the other end is connected with the positive link of power supply;
The negative pole of another voltage stabilizing didoe is connected with the negative link of operational amplifier, and the other end is connected with the negative link of power supply.
Further, described feedback module comprises feedback resistance and feedback capacity, and described feedback resistance and described feedback capacity are connected in parallel.
Further, the resistance of described feedback resistance is 1G Europe.
Further, the resistance of described feedback filtering resistance is 1G Europe.
Further, the capacitive reactance of described feedback capacity is 1000PF.
The beneficial effect that adopts above-mentioned further scheme is to adopt larger electric capacity and the larger resistance of impedance of capacitive reactance, increases the impedance of circuit, and has suppressed the generation of null offset.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams;
Fig. 2 is the circuit theory diagrams during the utility model is used.
In the accompanying drawing, the list of parts of each label representative is as follows:
R1, current limliting filter resistance, D1, the first voltage stabilizing didoe, D2, the second voltage stabilizing didoe, C1, feedback capacity, R2, feedback resistance, U1, operational amplifier, C2 electric capacity, R3, resistance, A1, sensor interface.
Embodiment
Below in conjunction with accompanying drawing principle of the present utility model and feature are described, institute gives an actual example and only is used for explaining the utility model, is not be used to limiting scope of the present utility model.
As shown in Figure 1, be the utility model circuit theory diagrams; Fig. 2 is the circuit theory diagrams during the utility model is used.
The preposition charge amplifier of a kind of low noise comprises feedback module 2, operational amplifier U1, and voltage-stabilizing protection module 1 and feedback filtering resistance R 1, described feedback module 2 is connected between the negative input end and output of described operational amplifier U1, is used for consisting of feedback loop.
One end of described voltage-stabilizing protection module 1 is connected with the negative input end of described operational amplifier U1 respectively with an end of described feedback filtering resistance R 1, is used for input signal is carried out filtering noise and circuit is carried out voltage-stabilizing protection;
The other end of described voltage-stabilizing protection module 1 is connected with power supply, and the other end of described feedback filtering resistance R 1 and signal input part are used to the voltage-stabilizing protection module for power supply.
Described voltage-stabilizing protection module 1 comprises the first voltage stabilizing didoe D1 and the second voltage stabilizing didoe D2;
The negative pole of the first voltage stabilizing didoe D1 is connected with the negative link of operational amplifier U1, and the positive pole of the first voltage stabilizing didoe D1 is connected with the negative link-2.6_AP of power supply;
The positive pole of the second voltage stabilizing didoe D2 is connected with the negative link of operational amplifier U1, and the negative pole of the second voltage stabilizing didoe D2 is connected with the positive link+2.6_AP of power supply.
Described feedback module 2 comprises feedback resistance R2 and feedback capacity C1, and described feedback resistance R2 and described feedback capacity C1 are connected in parallel.The resistance of described feedback resistance R2 is 1G Europe.The resistance of described feedback filtering resistance R 1 is 1G Europe.The capacitive reactance of described feedback capacity is 1000PF.
Among Fig. 2, one end of capacitor C 2 is connected with the negative link of described operational amplifier, the other end ground connection of capacitor C 2, one end of resistance R 3 is connected with the positive link of described operational amplifier, the other end ground connection of resistance R 3, but the signal output part of sensor interface A1 external sensor is converted into the operations such as voltage with carrying out filtering, amplification, electric charge in this signal introduction circuit.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. the preposition charge amplifier of low noise is characterized in that: comprise feedback module (2), operational amplifier (U1), voltage-stabilizing protection module (1) and feedback filtering resistance (R1);
Described feedback module (2) is connected between the negative input end and output of described operational amplifier (U1), is used for consisting of feedback loop;
One end of one end of described voltage-stabilizing protection module (1) and described feedback filtering resistance (R1) is connected with the negative input end of described operational amplifier (U1) respectively, is used for input signal is carried out filtering noise and circuit is carried out voltage-stabilizing protection;
The other end of described voltage-stabilizing protection module (1) is connected with power supply, and the other end and the signal input part of described feedback filtering resistance (R1) are used to the voltage-stabilizing protection module for power supply.
2. the preposition charge amplifier of low noise according to claim 1, it is characterized in that: described voltage-stabilizing protection module (1) comprises the first voltage stabilizing didoe (D1) and the second voltage stabilizing didoe (D2);
The negative pole of the first voltage stabilizing didoe (D1) is connected with the negative link of operational amplifier (U1), and the positive pole of the first voltage stabilizing didoe (D1) is connected with the negative link of power supply;
The positive pole of the second voltage stabilizing didoe (D2) is connected with the negative link of operational amplifier (U1), and the negative pole of the second voltage stabilizing didoe (D2) is connected with the positive link of power supply.
3. the preposition charge amplifier of low noise according to claim 1, it is characterized in that: described feedback module (2) comprises feedback resistance (R2) and feedback capacity (C1), described feedback resistance (R2) is connected in parallel with described feedback capacity (C1).
4. the preposition charge amplifier of low noise according to claim 3, it is characterized in that: the resistance of described feedback resistance (R2) is 1G Europe.
5. the preposition charge amplifier of low noise according to claim 3, it is characterized in that: the resistance of described feedback filtering resistance (R1) is 1G Europe.
6. the preposition charge amplifier of low noise according to claim 3, it is characterized in that: the capacitive reactance of described feedback capacity is 1000PF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220576081 CN202918246U (en) | 2012-11-01 | 2012-11-01 | Preposed charge amplifier with low noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220576081 CN202918246U (en) | 2012-11-01 | 2012-11-01 | Preposed charge amplifier with low noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202918246U true CN202918246U (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220576081 Expired - Lifetime CN202918246U (en) | 2012-11-01 | 2012-11-01 | Preposed charge amplifier with low noise |
Country Status (1)
| Country | Link |
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| CN (1) | CN202918246U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588951A (en) * | 2014-10-23 | 2016-05-18 | 北京自动化控制设备研究所 | Molecular electronic angular accelerometer weak signal processing circuit |
| CN106961280A (en) * | 2017-05-09 | 2017-07-18 | 南京国电南自维美德自动化有限公司 | A kind of input signal filter circuit of converter |
-
2012
- 2012-11-01 CN CN 201220576081 patent/CN202918246U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588951A (en) * | 2014-10-23 | 2016-05-18 | 北京自动化控制设备研究所 | Molecular electronic angular accelerometer weak signal processing circuit |
| CN106961280A (en) * | 2017-05-09 | 2017-07-18 | 南京国电南自维美德自动化有限公司 | A kind of input signal filter circuit of converter |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |