CN209402495U - A kind of acquisition circuit of photo diode differential signal - Google Patents
A kind of acquisition circuit of photo diode differential signal Download PDFInfo
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- CN209402495U CN209402495U CN201821453781.XU CN201821453781U CN209402495U CN 209402495 U CN209402495 U CN 209402495U CN 201821453781 U CN201821453781 U CN 201821453781U CN 209402495 U CN209402495 U CN 209402495U
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Abstract
The purpose of the utility model is to provide a kind of acquisition circuits of photo diode differential signal, the acquisition circuit includes: photodiode, Current Voltage circuit, differential signal processing circuit and Differential OPAMP circuit, wherein, the photodiode and the Current Voltage circuit connection, the output end of the Current Voltage circuit is connect with the input terminal of the differential signal processing circuit, and the input terminal of the Differential OPAMP circuit is connect with the output end of the differential signal processing circuit；The photodiode generates photoelectric current by received illumination, and the Current Voltage circuit generates differential signal by the photoelectric current flowed into, and the differential signal processing circuit inputs the Differential OPAMP circuit input end after being handled the differential signal of generation.So that the photoelectric conversion signal of photodiode can be converted into standard difference signal, photoelectric sensor can be improved circuit signal-to-noise ratio NSR with difference channel, and resistance to common mode interference performance is substantially increased, and structure simplifies.
Description
Technical field
The utility model relates to a kind of acquisition of photoelectric sensor field more particularly to photo diode differential signal electricity
Road.
Background technique
In electronic product, more and more modulus (A/D) converters are designed to Differential Input, in practical situations,
Signal more occurs in the form of single-ended signal, in order to can be carried out analog-to-digital conversion, signal is needed to be converted into difference from single-ended signal
Signal, and matched Differential OPAMP FDA (Fully differential Amplifier) also comes into vogue.It passes
The I-V translation circuit of system is designed to single-ended signal, and even with difference amplifier, circuit poor signal to noise, resistance to common mode interference performance is low,
It is unable to reach desired effect.
Utility model content
The purpose of the utility model is to provide a kind of acquisition circuits of photo diode differential signal, are obtained with solving tradition
Differential signal interference free performance of bring single-ended signal and sensitivity performance is poor and data precision difference is asked when being applied
Topic.
In order to solve the above technical problems, one side according to the present utility model, provides a kind of photo diode differential letter
Number acquisition circuit, the acquisition circuit includes: photodiode, Current Voltage circuit, differential signal processing circuit and complete poor
Divide operational amplifier circuit, wherein
The photodiode and the Current Voltage circuit connection, the output end of the Current Voltage circuit and the difference
The input terminal of sub-signal processing circuit connects, input terminal and the differential signal processing circuit of the Differential OPAMP circuit
Output end connection；
The photodiode generates photoelectric current, the photoelectricity that the Current Voltage circuit passes through inflow by received illumination
The raw differential signal of miscarriage, the differential signal processing circuit input the fully differential fortune after being handled the differential signal of generation
Put circuit input end.
Further, the differential signal processing circuit includes symmetric low-pass filter circuit and block isolating circuit, wherein described
The input terminal of symmetric low-pass filter circuit is connect with the output end of the Current Voltage circuit, the symmetric low-pass filter circuit
Output end is connect with the input terminal of the block isolating circuit, and the differential signal of generation is filtered by the symmetric low-pass filter circuit
The block isolating circuit is input to after processing.
Further, the Current Voltage circuit include biasing resistor, the first negative feedback resistor, the second negative feedback resistor,
First feed-forward capacitance, the second feed-forward capacitance, PNP pipe, NPN pipe, first voltage resistance and second voltage resistance, wherein described the
One voltage resistance is identical with the resistance value of the second voltage resistance.
Further, the both ends of the biasing resistor are electric with first negative feedback resistor and second negative-feedback respectively
Resistance connection, first feed-forward capacitance is in parallel with first negative feedback resistor, second feed-forward capacitance and described second negative
Feedback resistance is in parallel, and the base stage of the PNP pipe is connected with the biasing resistor and first negative feedback resistor respectively, described
The collector of PNP pipe is connected with first negative feedback resistor, first voltage resistance, the base stage of the NPN pipe respectively with it is described
Biasing resistor and second negative feedback resistor are connected, the collector of the NPN pipe and second negative feedback resistor, the second electricity
Piezoresistance is connected.
Further, the symmetric low-pass filter circuit includes first resistor, second resistance and first capacitor, wherein institute
The one end for stating first resistor is connected with the first voltage resistance, and the other end is connect with the first capacitor, the second resistance
One end be connected with the second voltage resistance, the other end is connect with the first capacitor.
Further, the block isolating circuit includes the second capacitor and third capacitor, wherein second capacitor and described the
Three capacitors are symmetrical about the first capacitor, and the value of second capacitor and third capacitor includes 0.01uF~0.1uF.
Further, signal center's level of the Differential OPAMP circuit access is the working power for obtaining circuit
The half of voltage.
Further, the Current Voltage circuit includes the 2nd 1 resistance, the two or two resistance, the first photodiode and the
Two photodiodes, wherein the 2nd 1 resistance, the first photodiode, the two or two resistance and the second photodiode according to
Secondary connection forms bridge circuit.
Further, the differential signal processing circuit includes the first coupled capacitor, the second coupled capacitor, the two or three resistance
With the two or four resistance, wherein the circuit that first coupled capacitor and the two or three resistance are composed in series couples electricity with described second
Hold the circuit symmetrical being composed in series with the two or four resistance, first coupled capacitor and two pole of 21 resistance and the first photoelectricity
The anode connection of pipe, second coupled capacitor are connect with the cathode of the two or two resistance and the second photodiode.
Further, the Current Voltage circuit further includes the first thermo-sensitive resistor and the second thermo-sensitive resistor, wherein described
One thermo-sensitive resistor, the 2nd 1 resistance, the first photodiode, the two or two resistance, the second thermo-sensitive resistor and the second photodiode
It is sequentially connected composition bridge circuit, first thermo-sensitive resistor is identical with the resistance value of second thermo-sensitive resistor.
Further, the Current Voltage circuit further includes third thermo-sensitive resistor, wherein the one of the third thermo-sensitive resistor
End is connect with the 2nd 1 resistance and the first photodiode, the other end and the two or two resistance and the second photodiode
Connection.
Further, the Current Voltage circuit include the first amplifying circuit, the first feedback resistance, the second amplifying circuit and
Second feedback resistance, wherein the cathode and first amplifying circuit of first feedback resistance and the photodiode
Cathode connection, second feedback resistance are connect with the cathode of positive and described second amplifying circuit of the photodiode,
First feedback resistance is identical as the resistance value of second feedback resistance.
Further, the differential signal processing circuit includes symmetric low-pass filter circuit and coupling circuit, wherein described
The input terminal of symmetric low-pass filter circuit is connect with the output end of the Current Voltage circuit, the symmetric low-pass filter circuit
Output end is connect with the input terminal of the coupling circuit, and the differential signal of generation is filtered by the symmetric low-pass filter circuit
The coupling circuit are input to after processing.
Further, the symmetric low-pass filter circuit includes first resistor, second resistance and first capacitor, wherein institute
The one end for stating first resistor is connected with the output end of first feedback resistance and first amplifying circuit, the other end with it is described
First capacitor connection, the output end phase of one end of the second resistance and second feedback resistance and second amplifying circuit
Even, the other end is connect with the first capacitor.
Further, the coupling circuit include the first coupled capacitor, the second coupled capacitor, the two or three resistance and the two or four
Resistance, wherein the circuit and second coupled capacitor and second that first coupled capacitor and the two or three resistance are composed in series
The circuit symmetrical that four resistance are composed in series, first coupled capacitor are connect with the first resistor, second coupled capacitor
It is connect with the second resistance.
Compared with prior art, the utility model provides a kind of acquisition circuit of photo diode differential signal, described to obtain
Sense circuit includes: photodiode, Current Voltage circuit, differential signal processing circuit and Differential OPAMP circuit, wherein described
Photodiode and the Current Voltage circuit connection, the output end of the Current Voltage circuit and differential signal processing electricity
The input terminal on road connects, and the input terminal of the Differential OPAMP circuit is connect with the output end of the differential signal processing circuit；
The photodiode generates photoelectric current by received illumination, and it is poor that the Current Voltage circuit is generated by the photoelectric current flowed into
Sub-signal, the differential signal processing circuit inputs the Differential OPAMP circuit after being handled the differential signal of generation defeated
Enter end.So that the photoelectric conversion signal of photodiode can be converted into standard difference signal, and than passing through amplifier reality
The difference channel applied has the advantage in cost, and photoelectric sensor can be improved circuit signal-to-noise ratio NSR with difference channel, resistance to total
Mould jamming performance is substantially increased, and a shielding piece reduces or eliminates, and simplifies structure.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the utility model
Other features, objects and advantages will become more apparent upon:
Fig. 1 shows a kind of acquisition circuit signal for photo diode differential signal that the utility model provides on one side
Figure；
Fig. 2 shows the circuit diagrams of the acquisition differential signal of one of an embodiment of the present invention form；
Fig. 3 shows the signal that one of an embodiment of the present invention obtains the circuit access late-class circuit of differential signal
Figure；
Fig. 4 show one of an embodiment of the present invention obtain differential signal circuit access late-class circuit after it is each
Waveform diagram；
Fig. 5 shows the circuit diagram of the acquisition differential signal of one of another embodiment of the utility model form；
Fig. 6 shows the circuit diagram of one of another embodiment of the utility model temperature-compensating；
Fig. 7 shows the circuit diagram of another temperature-compensating in another embodiment of the utility model；
Fig. 8 shows internal resistance circuit diagram in one of another embodiment of the utility model differential signal；
Fig. 9 shows the circuit diagram of the acquisition differential signal of one of the utility model another embodiment form.
The same or similar appended drawing reference represents the same or similar component in attached drawing.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 shows a kind of acquisition circuit signal for photo diode differential signal that the utility model provides on one side
Figure, the acquisition circuit include: photodiode 10, Current Voltage circuit 20, differential signal processing circuit 30 and fully differential fortune
Discharge road 40, wherein the photodiode 10 is connect with the Current Voltage circuit 20, the Current Voltage circuit 20 it is defeated
Outlet is connect with the input terminal of the differential signal processing circuit 30, the input terminal of the Differential OPAMP circuit 40 with it is described
The output end of differential signal processing circuit 30 connects；The photodiode generates photoelectric current, the electricity by received illumination
Galvanic electricity volt circuit by flow into photoelectric current generate differential signal, the differential signal processing circuit by the differential signal of generation into
The Differential OPAMP circuit input end is inputted after row processing.So that the light of photodiode (Photo Diode, PD)
Electric conversion signal can be converted into standard difference signal, and the difference channel than being implemented by amplifier is with excellent in cost
Gesture, photoelectric sensor can be improved circuit signal-to-noise ratio NSR with difference channel, and resistance to common mode interference performance is substantially increased, and shield a piece
It reduces or eliminates, simplifies structure.
In an embodiment of the utility model, the differential signal processing circuit 30 includes 31 He of symmetric low-pass filter circuit
Block isolating circuit 32, wherein the output end of the input terminal of the symmetric low-pass filter circuit 31 and the Current Voltage circuit 20 connects
It connects, the output end of the symmetric low-pass filter circuit 31 is connect with the input terminal of the block isolating circuit 32, the symmetric low-pass filter
Wave circuit 31 is input to the block isolating circuit 32 after being filtered the differential signal of generation.Sheet as shown in Figure 2 is practical
The circuit diagram of one of novel embodiment acquisition differential signal, wherein the Current Voltage circuit 20 includes biasing
Resistance R1, the first negative feedback resistor R2, the second negative feedback resistor R3, the first feed-forward capacitance C1, the second feed-forward capacitance C2, PNP
Pipe, NPN pipe, first voltage resistance R4 and second voltage resistance R5, wherein the first voltage resistance R4 and the second voltage
The resistance value of resistance R5 is identical.As seen from Figure 2, the both ends of the biasing resistor R1 respectively with the first negative feedback resistor R2 and
The second negative feedback resistor R3 connection, the first feed-forward capacitance C1 is in parallel with the first negative feedback resistor R2, and described
Two feed-forward capacitance C2 are in parallel with the second negative feedback resistor R3, the base stage of the PNP pipe respectively with the biasing resistor R1 and
One end of the first negative feedback resistor R2 is connected, and the collector of the PNP pipe is another with the first negative feedback resistor R2's
End, first voltage resistance R4 be connected, the base stage of the NPN pipe respectively with the biasing resistor R1 and second negative feedback resistor
One end of R3 is connected, the other end, the second voltage resistance R5 of the collector of the NPN pipe and the second negative feedback resistor R3
It is connected.
Here, PNP pipe and NPN pipe are a pair of complementary triode being packaged together, and when there is illumination incidence, two pole of photoelectricity
The photoelectric current I that pipe PD is generatedpIt is flowed out from PNP pipe base stage, NPN pipe base stage flows into, and triode is Current amplifier element, and photoelectric current is
Base current then forms β times of image current I in transistor collectorcIf the parameter of a pair of of triode is identical, Ic1
And Ic2It is identical, become Ic, VCMNo current compensation.If the parameter of triode has difference, it is respectively formed Ic1And Ic2, electric current exists
Voltage drop V1 and V2 are formed on R4 and R5, V1 with V2 size is identical in the case of circuit symmetrical, it is contrary, become rear class needs
Differential signal.In an embodiment of the utility model, circuit element effect and design parameter setting and calculating can be as follows:
Biasing resistor R1 for triode PNP pipe and NPN pipe provides direct current biasing simultaneously, make under static conditions TA1NPN and
PNP pipe is in lightly conducting state 510k~1.2M；R2 and R3 is parallel voltage negtive backword resistance, guarantees triode quiescent point
Stablize, value range is about 500k.C1 and C2 is feedforward resistance, removes flash removed and interference signal, increases circuit stability, one
As be 1~2PF；R4 and R5 is transistor collector resistance, and generation voltage signal value is 2k Ω~3.3k Ω, to obtain phase
Same amount, can make R4=R5.
Above-described embodiment is connect, the symmetric low-pass filter circuit 31 includes first resistor R6, second resistance R7 and the first electricity
Hold C3, wherein one end of the first resistor R6 is connected with the first voltage resistance R4, the other end and the first capacitor
C3 connection, one end of the second resistance R7 are connected with the second voltage resistance R5, and the other end and the first capacitor C3 connect
It connects.Physical circuit form is as shown in Figure 2, wherein constitutes symmetric low-pass filter circuit by R6, R7 and C3, R6 and R7 value is about
For 100 Ω, C3 is determined according to signal frequency.
It connects and refers to Fig. 2, the block isolating circuit 32 includes the second capacitor C4 and third capacitor C5, wherein second electricity
It is symmetrical about the first capacitor C3 to hold the C4 and third capacitor C5, the value packet of the second capacitor C4 and third capacitor C5
Include 0.01uF~0.1uF.Wherein, C4 and C5 forms block isolating circuit, and the DC potential of front stage amplifier is set, generally
0.01uF~0.1uF.
By circuit shown in Fig. 2, the differential signal of photodiode can be obtained, enhances common mode interference, when being interfered
When the equidirectional variation of V1 and V2, the difference channel of rear class can draw up the variation, reduce the influence for even being eliminated interference.
In another embodiment of the utility model, as shown in figure 3, the difference channel of above-mentioned acquisition and rear class Differential OPAMP
The connection type of circuit (FDA), wherein the signal center level VCM of the Differential OPAMP circuit access is the acquisition electricity
The half of the working power vdd voltage on road.Connection for the influence for eliminating DC component, late-class circuit FDA uses C4 and C5 coupling
Capacitor is closed, by the symmetrical filter network of R6 and R7 and C3 composition, the AC compounent of V1 and V2 are by filtering and coupling, with one kind
Symmetrical circuit form enters rear class FDA, and FDA waveforms at different levels are as shown in Figure 4.Work as Rg1=Rg2=Rg, Rf3=Rf4=Rf,
Vo1=V1*Rf3/Rg1, Vo2=V2*Rf4/Rg2, Vo1=Vo2=Rf/Rg signal amplitude is equal, but polarity is on the contrary, Vo=Vo1。
In a specific embodiment of the present invention, the form of the Current Voltage circuit can also make as shown in Fig. 5
With two light emitting diodes, the Current Voltage circuit 20 includes the 2nd 1 resistance R1, the two or two resistance R2, two pole of the first photoelectricity
Pipe PD1 and the second photodiode PD2, wherein the 2nd 1 resistance R1, the first photodiode PD1, the two or two resistance R2
And second photodiode PD2 be sequentially connected composition bridge circuit.Here, I-V differential signal can be obtained by the bridge circuit
It takes, then is directly injected into late-class circuit FDA amplifier.R1 and R2 are equal, and apply back-pressure to PD1 and PD2.
With continued reference to Fig. 5, the differential signal processing circuit 30 include the first coupled capacitor C1, the second coupled capacitor C2,
Two or three resistance R3 and the two or four resistance R4, wherein the electricity that the first coupled capacitor C1 and the two or three resistance R3 are composed in series
The circuit symmetrical that road and the second coupled capacitor C2 and the two or four resistance R4 are composed in series, the first coupled capacitor C1 with
The anode connection of the 21 resistance R1 and the first photodiode PD1, the second coupled capacitor C2 and the two or two electricity
Hinder the cathode connection of R2 and the second photodiode PD2.Here, current potential V1 increases when light incidence, V2 is reduced, and V1, V2 are logical
Overcoupling capacitor C1, C2 access FDA differential input end and carry out signal amplification, to keep good common mode interference to draw up ability, R3
And R4, R5 and R6 value should keep identical, then Uo=(V1-V2) * R5/R1.
For the circuit of form shown in Fig. 5, temperature-compensating can also be carried out, because circuit V1 and V2 are in temperature change
When change in the opposite direction, such as when the temperature increases, the electric current Ipd of diode increases, and V1 increases, and V2 reduces, and compares single-ended letter
Number, it is exaggerated influence of the temperature to signal, therefore compensate to temperature needs, the design of compensation circuit can be in Fig. 5 jackshaft
Each bridge arm compensates in formula circuit, as shown in fig. 6, the Current Voltage circuit 20 further includes the first thermo-sensitive resistor Rt1 and
Two thermo-sensitive resistor Rt2, wherein the first thermo-sensitive resistor Rt1, the 2nd 1 resistance R1, the first photodiode PD1, the two or two
Resistance R2, the second thermo-sensitive resistor Rt2 and the second photodiode PD2 are sequentially connected composition bridge circuit, the first temperature sensitive electricity
It is identical with the resistance value of the second thermo-sensitive resistor Rt2 to hinder Rt1.To which when temperature T is increased, the electric current Ipd1 of PD1 increases, Rt1
Reduce, V1 is remained unchanged.When temperature T is increased, the electric current Ipd2 of PD2 increases, and Rt12 reduces, and V2 is remained unchanged.
Temperature-compensating is carried out, the compensation method of a thermo-sensitive resistor can also be used, as shown in fig. 7, the Current Voltage is electric
Road 20 further includes third thermo-sensitive resistor Rt, wherein one end of the third thermo-sensitive resistor Rt and the 2nd 1 resistance R1 and the
One photodiode PD1 connection, the other end are connect with the two or the two resistance R2 and the second photodiode PD2.
It should be noted that PD generation is controlled current source, internal resistance > > R1, R2, grid bias power supply VR are voltage source, interior
≈ 0 is hindered, therefore, the internal resistance that the both ends V1 and V2 are presented is as shown in Figure 8: internal resistance Ro=R1+R2.The input impedance Ri of FDA > > Rt.
It can be seen that: because temperature T raising → Ipd increase → V1 increases；Temperature T raising → Ipd increase → V2 reduces；Vo increase →
IRt increases, and temperature T raising → Rt reduces.And Vo=IRt* (Ro//Rt), so, to R1, R2, Rt appropriate value, Vo is basic
It remains unchanged.
In the another embodiment of the utility model, the form for obtaining difference channel can be as shown in figure 9, the electric current
Potential circuit 20 includes the first amplifying circuit A1, the first feedback resistance Rf1, the second amplifying circuit A2 and the second feedback resistance Rf2,
Wherein, the first feedback resistance Rf1 is connect with the cathode of the cathode of the photodiode and the first amplifying circuit A1,
The second feedback resistance Rf2 is connect with the cathode of the positive and described second amplifying circuit A2 of the photodiode, described
First feedback resistance Rf1 is identical as the resistance value of the second feedback resistance Rf2.Here, the differential signal processing circuit 30 is wrapped
Include symmetric low-pass filter circuit 31 ' and coupling circuit 32 ', wherein the input terminal of the symmetric low-pass filter circuit 31 ' and institute
State the output end connection of Current Voltage circuit 20, the output end of the symmetric low-pass filter circuit 31 ' and the coupling circuit
32 ' input terminal connection, the symmetric low-pass filter circuit 31 ' are input to institute after being filtered the differential signal of generation
State coupling circuit 32 '.
Further, the symmetric low-pass filter circuit 31 ' includes first resistor R1, second resistance R2 and first capacitor
C3, wherein the output end of one end of the first resistor R1 and the first feedback resistance Rf1 and the first amplifying circuit A1
It is connected, the other end is connect with the first capacitor C3, one end of the second resistance R2 and the second feedback resistance Rf2 and institute
The output end for stating the second amplifying circuit A2 is connected, and the other end is connect with the first capacitor C3.The coupling circuit 32 ' include the
One coupled capacitor C1, the second coupled capacitor C2, the two or three resistance Rg1 and the two or four resistance Rg2, wherein the first coupling electricity
Hold the circuit that C1 and the two or three resistance Rg1 is composed in series to be composed in series with the second coupled capacitor C2 and the two or four resistance Rg2
Circuit symmetrical, the first coupled capacitor C1 connect with the first resistor R1, the second coupled capacitor C2 and described the
Two resistance R2 connections.
When there is illumination incidence, the photoelectric current Ipd that photodiode PD is generated flows through feedback resistance Rf1, forms V1 voltage,
It forms single-ended signal and flows through Rf2 formation V2 voltage.V1 with V2 voltage magnitude is identical, contrary, forms differential signal, directly quilt
Subsequent difference amplifier picks up, rather than needs single-ended transfer difference circuit again.Wherein, the Vref1 of Rf1=Rf2, amplifier A1 > put
The Vref2 of big device A2.V1=Vref+Ipd*Rf1.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are included in the utility model.It should not treat any reference in the claims as limiting
Related claim.Furthermore, it is to be understood that one word of " comprising " does not exclude other units or steps, odd number is not excluded for plural number.Device
The multiple units or device stated in claim can also be implemented through software or hardware by a unit or device.The
One, the second equal words are used to indicate names, and are not indicated any particular order.
Claims (15)
1. a kind of acquisition circuit of photo diode differential signal, which is characterized in that the acquisition circuit includes: two pole of photoelectricity
Pipe, Current Voltage circuit, differential signal processing circuit and Differential OPAMP circuit, wherein
The photodiode and the Current Voltage circuit connection, the output end of the Current Voltage circuit and the difference are believed
The input terminal connection of number processing circuit, the input terminal of the Differential OPAMP circuit and the output of the differential signal processing circuit
End connection；
The photodiode generates photoelectric current by received illumination, and the Current Voltage circuit is miscarried by the photoelectricity flowed into
Raw differential signal, the differential signal processing circuit input the Differential OPAMP electricity after being handled the differential signal of generation
Road input terminal.
2. the acquisition circuit of photo diode differential signal according to claim 1, which is characterized in that the differential signal
Processing circuit includes symmetric low-pass filter circuit and block isolating circuit, wherein the input terminal of the symmetric low-pass filter circuit and institute
State the output end connection of Current Voltage circuit, the output end of the symmetric low-pass filter circuit and the input terminal of the block isolating circuit
Connection, the symmetric low-pass filter circuit are input to the block isolating circuit after being filtered the differential signal of generation.
3. the acquisition circuit of photo diode differential signal according to claim 2, which is characterized in that the Current Voltage
Circuit includes biasing resistor, the first negative feedback resistor, the second negative feedback resistor, the first feed-forward capacitance, the second feed-forward capacitance, PNP
Pipe, NPN pipe, first voltage resistance and second voltage resistance, wherein the first voltage resistance and the second voltage resistance
Resistance value is identical.
4. the acquisition circuit of photo diode differential signal according to claim 3, which is characterized in that the biasing resistor
Both ends connect respectively with first negative feedback resistor and second negative feedback resistor, first feed-forward capacitance with it is described
First negative feedback resistor is in parallel, and second feed-forward capacitance is in parallel with second negative feedback resistor, the base stage point of the PNP pipe
It is not connected with the biasing resistor and first negative feedback resistor, the collector of the PNP pipe and first negative-feedback electricity
Resistance, first voltage resistance be connected, the base stage of the NPN pipe respectively with the biasing resistor and the second negative feedback resistor phase
Even, the collector of the NPN pipe is connected with second negative feedback resistor, second voltage resistance.
5. the acquisition circuit of photo diode differential signal according to claim 3, which is characterized in that the symmetric low-pass
Filter circuit includes first resistor, second resistance and first capacitor, wherein one end of the first resistor and the first voltage
Resistance is connected, and the other end is connect with the first capacitor, and one end of the second resistance is connected with the second voltage resistance, separately
One end is connect with the first capacitor.
6. the acquisition circuit of photo diode differential signal according to claim 5, which is characterized in that the block isolating circuit
Including the second capacitor and third capacitor, wherein second capacitor is symmetrical about the first capacitor with the third capacitor, institute
The value for stating the second capacitor and third capacitor includes 0.01uF~0.1uF.
7. the acquisition circuit of photo diode differential signal according to claim 1, which is characterized in that the fully differential fortune
The signal center's level that road is accessed that discharges is the half of the working power voltage of the acquisition circuit.
8. the acquisition circuit of photo diode differential signal according to claim 1, which is characterized in that the Current Voltage
Circuit includes the 2nd 1 resistance, the two or two resistance, the first photodiode and the second photodiode, wherein the described 2nd 1
Resistance, the first photodiode, the two or two resistance and the second photodiode are sequentially connected composition bridge circuit.
9. the acquisition circuit of photo diode differential signal according to claim 8, which is characterized in that the differential signal
Processing circuit includes the first coupled capacitor, the second coupled capacitor, the two or three resistance and the two or four resistance, wherein first coupling
Close circuit and second coupled capacitor that capacitor and the two or three resistance are composed in series and the circuit that the two or four resistance is composed in series
Symmetrically, first coupled capacitor is connect with the anode of 21 resistance and the first photodiode, the second coupling electricity
Appearance is connect with the cathode of the two or two resistance and the second photodiode.
10. the acquisition circuit of photo diode differential signal according to claim 8, which is characterized in that the electric current electricity
Volt circuit further includes the first thermo-sensitive resistor and the second thermo-sensitive resistor, wherein first thermo-sensitive resistor, the 2nd 1 resistance, first
Photodiode, the two or two resistance, the second thermo-sensitive resistor and the second photodiode are sequentially connected composition bridge circuit, and described
One thermo-sensitive resistor is identical with the resistance value of second thermo-sensitive resistor.
11. the acquisition circuit of photo diode differential signal according to claim 8, which is characterized in that the electric current electricity
Volt circuit further includes third thermo-sensitive resistor, wherein one end of the third thermo-sensitive resistor and the 2nd 1 resistance and the first light
Electric diode connection, the other end are connect with the two or two resistance and the second photodiode.
12. the acquisition circuit of photo diode differential signal according to claim 1, which is characterized in that the electric current electricity
Volt circuit includes the first amplifying circuit, the first feedback resistance, the second amplifying circuit and the second feedback resistance, wherein described first
Feedback resistance is connect with the cathode of the cathode of the photodiode and first amplifying circuit, second feedback resistance with
The cathode of positive and described second amplifying circuit of the photodiode connects, and first feedback resistance is anti-with described second
The resistance value for feeding resistance is identical.
13. the acquisition circuit of photo diode differential signal according to claim 12, which is characterized in that the difference letter
Number processing circuit includes symmetric low-pass filter circuit and coupling circuit, wherein the input terminal of the symmetric low-pass filter circuit with
The output end of the Current Voltage circuit connects, the output end of the symmetric low-pass filter circuit and the input of the coupling circuit
End connection, the symmetric low-pass filter circuit are input to the coupling circuit after being filtered the differential signal of generation.
14. the acquisition circuit of photo diode differential signal according to claim 13, which is characterized in that described symmetrical low
Bandpass filter circuit includes first resistor, second resistance and first capacitor, wherein one end of the first resistor is anti-with described first
The output end of feed resistance and first amplifying circuit is connected, and the other end is connect with the first capacitor, the second resistance
One end is connected with the output end of second feedback resistance and second amplifying circuit, and the other end and the first capacitor connect
It connects.
15. the acquisition circuit of photo diode differential signal according to claim 14, which is characterized in that the coupling electricity
Road includes the first coupled capacitor, the second coupled capacitor, the two or three resistance and the two or four resistance, wherein first coupled capacitor
The circuit symmetrical that the circuit and second coupled capacitor that are composed in series with the two or three resistance and the two or four resistance are composed in series, institute
It states the first coupled capacitor to connect with the first resistor, second coupled capacitor is connect with the second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821453781.XU CN209402495U (en) | 2018-09-05 | 2018-09-05 | A kind of acquisition circuit of photo diode differential signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821453781.XU CN209402495U (en) | 2018-09-05 | 2018-09-05 | A kind of acquisition circuit of photo diode differential signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900187A (en) * | 2018-09-05 | 2018-11-27 | 上海索迪龙自动化有限公司 | A kind of acquisition circuit of photo diode differential signal |
| CN117097335A (en) * | 2023-10-18 | 2023-11-21 | 南京天易合芯电子有限公司 | High-sensitivity proximity light detection sensor |
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2018
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900187A (en) * | 2018-09-05 | 2018-11-27 | 上海索迪龙自动化有限公司 | A kind of acquisition circuit of photo diode differential signal |
| CN108900187B (en) * | 2018-09-05 | 2024-03-26 | 上海索迪龙自动化有限公司 | Photodiode differential signal acquisition circuit |
| CN117097335A (en) * | 2023-10-18 | 2023-11-21 | 南京天易合芯电子有限公司 | High-sensitivity proximity light detection sensor |
| CN117097335B (en) * | 2023-10-18 | 2024-01-26 | 南京天易合芯电子有限公司 | High-sensitivity proximity light detection sensor |
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