CN110017768A - A kind of design method avoiding PSD signal processing circuit output negative pressure - Google Patents
A kind of design method avoiding PSD signal processing circuit output negative pressure Download PDFInfo
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- CN110017768A CN110017768A CN201910164661.0A CN201910164661A CN110017768A CN 110017768 A CN110017768 A CN 110017768A CN 201910164661 A CN201910164661 A CN 201910164661A CN 110017768 A CN110017768 A CN 110017768A
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- signal processing
- processing circuit
- negative pressure
- psd
- circuit output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
Abstract
The invention discloses a kind of design methods for avoiding PSD signal processing circuit output negative pressure, specifically: defining operational amplifier output offset voltage in the I/V conversion circuit of PSD signal processing circuit is △ u1, the amplification factor of operational amplification circuit is K, operational amplifier output offset voltage is △ u2, in the case where background light intensity is zero, signal processing circuit output voltage U1=△ u1*K+ △ u2, reasonably select parameter K, △ u1 and △ u2, guarantee u2 > 0 U1=△ u1*K+ △, that is, PSD signal processing circuit is avoided to export negative pressure.The present invention can reach the purpose that PSD signal processing circuit output negative pressure is avoided from design source.
Description
Technical field
The present invention relates to field of signal processing more particularly to a kind of designs for avoiding PSD signal processing circuit output negative pressure
Method.
Background technique
PSD (position sensing component) has been widely used test measurement etc. as mature photoelectric sensitive device
Each field.The prime processing of PSD signal is generally combined using sample I/V conversion circuit and operational amplification circuit, and PSD device is exported
Weak current signal be converted into scheduled voltage signal, for further acquiring and handling.Due to I/V conversion circuit and operation amplifier
The intrinsic offset voltage of operational amplifier chip used in circuit, it is possible that PSD signal processing circuit exports negative voltage
The case where, it is easy to damage rear class acquisition equipment, or need to acquire equipment and have negative pressure input capability.Currently, eliminating
PSD signal processing circuit, which exports negative pressure, can increase processing electricity by increasing processing circuit or enhancing the method for environmental light intensity
The method on road not only increases research and development cost, while increasing the complexity of circuit, reduces reliability；Enhance environmental light intensity
Method then will increase the application limitation of circuit.For this purpose, studying a kind of PSD signal processing circuit output negative pressure is avoided from source
Design method is just very significant.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide avoid PSD signal processing circuit from design source
Export the design method of negative pressure.
To achieve the above object, present invention employs design methods below: the electric current of output all the way for defining PSD is fixed respectively
Justice is I1, and sampling resistor is R1 in I/V conversion circuit, the first operational amplifier offset voltage is △ u1, operational amplification circuit
Amplification factor is K, second operational amplifier offset voltage is △ u2, then corresponds to signal processing circuit output voltage U1 are as follows:
U1=(- I1*R1+ △ u1) * K+ △ u2
In the case where background light intensity is zero, electric current I1=0, signal processing circuit output voltage U1=△ u1*K+ △ u2,
Since K is negative,
As △ u1<0 and △ u2>0, u2>0 U1=△ u1*K+ △；
When u1<0 △ and u2<0 △, | △ u2 | when<△ u1*K, u2>0 U1=△ u1*K+ △；
When u1>0 △ and u2>0 △, | △ u1*K | when<△ u2, u2>0 U1=△ u1*K+ △；
Parameter K, △ u1 and △ u2 is reasonably selected, guarantees u2 > 0 U1=△ u1*K+ △, that is, can guarantee that bias light is zero by force
In the case of avoid PSD signal processing circuit export negative pressure.
When background light intensity is not zero, when output light electric current I1 > 0, there is K > 0 (- I1*R1) *；
+ K > 0 (- I1*R1) * U1=(- I1*R1+ △ u1) * K+ △ u2=(△ u1*K+ △ u2)；
Guarantee to avoid PSD signal processing circuit from exporting negative pressure in the case that background light intensity is not zero in this way.
Compared with prior art, the present invention have it is following the utility model has the advantages that
Circuit structure through the invention, and reasonable parameter is selected, it realizes from design source and avoids PSD signal processing electricity
The purpose of road output negative pressure.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature mesh of the invention
And advantage will become more apparent upon.
Fig. 1 is PSD signal processing circuit schematic diagram of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
The prime processing of PSD signal is generally combined using sample I/V conversion circuit and operational amplification circuit, and PSD device is defeated
Weak current signal out is converted into scheduled voltage signal, for further acquiring and handling.Since I/V conversion circuit and operation are put
The intrinsic offset voltage of operational amplifier chip used in big circuit, parameter designing is improper, it is possible that PSD signal is handled
The case where circuit output negative voltage, is easy to damage rear class acquisition equipment, or needs to acquire equipment and have negative pressure input
Ability.
By taking Fig. 1 as an example, the electric current of output all the way for defining PSD is respectively defined as I1, and sampling resistor is in I/V conversion circuit
R1, the first operational amplifier offset voltage are △ u1, and the amplification factor of operational amplification circuit is K, second operational amplifier is lacked of proper care
Voltage is △ u2, then corresponds to signal processing circuit output voltage U1 are as follows:
U1=(- I1*R1+ △ u1) * K+ △ u2
In the case where background light intensity is zero, electric current I1=0, signal processing circuit output voltage U1=△ u1*K+ △ u2,
Since K is negative,
As △ u1<0 and △ u2>0, u2>0 U1=△ u1*K+ △；
When u1<0 △ and u2<0 △, | △ u2 | when<△ u1*K, u2>0 U1=△ u1*K+ △；
When u1>0 △ and u2>0 △, | △ u1*K | when<△ u2, u2>0 U1=△ u1*K+ △；
Parameter K, △ u1 and △ u2 is reasonably selected, guarantees u2 > 0 U1=△ u1*K+ △, that is, can guarantee that bias light is zero by force
In the case of avoid PSD signal processing circuit export negative pressure.
When background light intensity is not zero, when output light electric current I1 > 0, there is K > 0 (- I1*R1) *；
+ K > 0 (- I1*R1) * U1=(- I1*R1+ △ u1) * K+ △ u2=(△ u1*K+ △ u2)；
Guarantee to avoid PSD signal processing circuit from exporting negative pressure in the case that background light intensity is not zero in this way.
To realize the purpose for avoiding PSD signal processing circuit output negative pressure from design source.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (1)
1. a kind of design method for avoiding PSD signal processing circuit output negative pressure, specific implementation are as follows: define PSD all the way
Output electric current is respectively defined as I1, and sampling resistor is R1 in I/V conversion circuit, the first operational amplifier offset voltage is △ u1,
The amplification factor of operational amplification circuit is K, second operational amplifier offset voltage is △ u2, then corresponds to signal processing circuit output
Voltage U1 are as follows:
U1=(- I1*R1+ △ u1) * K+ △ u2,
In the case where background light intensity is zero, electric current I1=0, signal processing circuit output voltage U1=△ u1*K+ △ u2, due to
K is negative,
As △ u1<0 and △ u2>0, u2>0 U1=△ u1*K+ △；
When u1<0 △ and u2<0 △, | △ u2 | when<△ u1*K, u2>0 U1=△ u1*K+ △；
When u1>0 △ and u2>0 △, | △ u1*K | when<△ u2, u2>0 U1=△ u1*K+ △；
Parameter K, △ u1 and △ u2 is reasonably selected, guarantees u2 > 0 U1=△ u1*K+ △, guarantees to keep away in the case that background light intensity is zero
Exempt from PSD signal processing circuit output negative pressure；
When background light intensity is not zero, when output light electric current I1 > 0, there is K > 0 (- I1*R1) *；
+ K > 0 (- I1*R1) * U1=(- I1*R1+ △ u1) * K+ △ u2=(△ u1*K+ △ u2)；
Guarantee to avoid PSD signal processing circuit from exporting negative pressure in the case that background light intensity is not zero in this way.
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| CN201910164661.0A CN110017768A (en) | 2019-03-05 | 2019-03-05 | A kind of design method avoiding PSD signal processing circuit output negative pressure |
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| CN104482874A (en) * | 2014-11-21 | 2015-04-01 | 上海卫星工程研究所 | On-orbit measurement system used for pointing relative deformation of satellite load |
| CN105444669A (en) * | 2015-11-30 | 2016-03-30 | 上海卫星工程研究所 | Measuring system and measuring method for large-scale plane directional variation |
| CN205509991U (en) * | 2015-12-31 | 2016-08-24 | 杭州士兰微电子股份有限公司 | Amplifier circuit and sensor signal processing apparatus |
| CN106442658A (en) * | 2016-09-12 | 2017-02-22 | 苏州工业园区职业技术学院 | Signal processing circuit of air quality detector |
| CN106546514A (en) * | 2015-09-22 | 2017-03-29 | 何志杰 | A kind of analog signal processing of light blockage method imager |
| CN108007479A (en) * | 2017-10-27 | 2018-05-08 | 上海卫星工程研究所 | A kind of design method for avoiding PSD signal process circuit output negative pressure |
| CN108801169A (en) * | 2018-06-25 | 2018-11-13 | 上海卫星工程研究所 | One-dimensional PSD sensor module suitable for the in-orbit deformation measurement of satellite structure |
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2019
- 2019-03-05 CN CN201910164661.0A patent/CN110017768A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04317350A (en) * | 1991-04-16 | 1992-11-09 | Matsushita Electric Ind Co Ltd | Noncontact potential measuring apparatus |
| CN105122968B (en) * | 2008-06-27 | 2013-01-02 | 上海卫星工程研究所 | Vacuum environment lower member measuring system for thermal deformation and measuring method thereof |
| CN104482874A (en) * | 2014-11-21 | 2015-04-01 | 上海卫星工程研究所 | On-orbit measurement system used for pointing relative deformation of satellite load |
| CN106546514A (en) * | 2015-09-22 | 2017-03-29 | 何志杰 | A kind of analog signal processing of light blockage method imager |
| CN105444669A (en) * | 2015-11-30 | 2016-03-30 | 上海卫星工程研究所 | Measuring system and measuring method for large-scale plane directional variation |
| CN205509991U (en) * | 2015-12-31 | 2016-08-24 | 杭州士兰微电子股份有限公司 | Amplifier circuit and sensor signal processing apparatus |
| CN106442658A (en) * | 2016-09-12 | 2017-02-22 | 苏州工业园区职业技术学院 | Signal processing circuit of air quality detector |
| CN108007479A (en) * | 2017-10-27 | 2018-05-08 | 上海卫星工程研究所 | A kind of design method for avoiding PSD signal process circuit output negative pressure |
| CN108801169A (en) * | 2018-06-25 | 2018-11-13 | 上海卫星工程研究所 | One-dimensional PSD sensor module suitable for the in-orbit deformation measurement of satellite structure |
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Application publication date: 20190716 |
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