CN206878783U - A kind of signal amplification circuit for saliva onset of ovulation detection device - Google Patents
A kind of signal amplification circuit for saliva onset of ovulation detection device Download PDFInfo
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- CN206878783U CN206878783U CN201720581869.9U CN201720581869U CN206878783U CN 206878783 U CN206878783 U CN 206878783U CN 201720581869 U CN201720581869 U CN 201720581869U CN 206878783 U CN206878783 U CN 206878783U
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Abstract
The utility model discloses a kind of signal amplification circuit for saliva onset of ovulation detection device, including：First operational amplification circuit, for carrying out anti-phase amplification by the AC signal in the first input signal and being superimposed the first bias voltage to obtain the second input signal；Second operational amplification circuit, for second input signal to be carried out into anti-phase amplification and is superimposed the second bias voltage；The input of output end series connection second operational amplification circuit of first operational amplification circuit.The utility model solves ac square wave signal when being bipolar signal, the problem of processing can produce distorted signals under single supply electric power thus supplied, make ac square wave signal conversion for direct current signal, and AC signal is exaggerated certain multiple and facilitates subsequent treatment, ensure that the accuracy of saliva onset of ovulation detection device.
Description
Technical field
Electronic technology field is the utility model is related to, a kind of more particularly to signal for saliva onset of ovulation detection device is put
Big circuit.
Background technology
Monitoring the onset of ovulation be reproductive medicine research as artificial insemination, inseminatio externalis and instruct Sterility patient grasp become pregnant when
The key link that machine is treated, it is significant to the clinic and research work of gynemetrics, while be also beneficial to implement to determine
When gestation realize prenatal and postnatal care and promote natural contraception.
Based on the impedance operator of electrolyte concentration and ovulation still in the saliva of buccal cavity of theoretical research stage in the prior art
Rule has the principle of certain correlation, and in order to realize the principle, it is high, easy to use, low that a kind of accuracy rate is designed in invention
Cost, the saliva onset of ovulation detection device used suitable for family the just active demand as Vehicles Collected from Market and hope.This saliva
Onset of ovulation detection device needs collection voltages signal to be used to detect, but is the friendship after exciting signal source partial pressure due to voltage signal
Square-wave signal is flowed, ac square wave signal is bipolar signal, and distorted signals can be produced under single supply electric power thus supplied, it is therefore desirable to
Ac square wave signal is converted to direct current signal, and AC signal is carried out into signal amplification to facilitate detection, and this just amplifies to signal
Circuit proposes certain requirement.
Therefore, it is necessary to which ac square wave signal can be converted to direct current signal and only in ac square wave signal by designing one kind
The circuit that is amplified of AC signal, to ensure that saliva onset of ovulation detection device can accurately measure experimental data.
Utility model content
The purpose of this utility model is to provide a kind of signal amplification circuit for saliva onset of ovulation detection device, the signal
Amplifying circuit is by the direct current signal in Capacitor apart ac square wave signal, by anti-phase operational amplification circuit only to ac square wave
The anti-phase amplification of AC signal in signal, and supply voltage is accessed in the in-phase input end of operational amplifier, given by electric resistance partial pressure
The anti-phase amplified signal of exchange of ac square wave signal is superimposed a bias direct current signal, is then passing through a see-saw circuit
To exchanging the secondary amplification of anti-phase amplified signal and anti-phase, a supply voltage is accessed in the in-phase input end of see-saw circuit,
The interference of direct current signal is eliminated by empty short principle, finally gives that a process is amplified twice and phase and ac square wave signal
Identical AC signal and voltage are the composite signal of VCC/2 bias direct current signal.
To achieve the above object, according to the one side of the utility model embodiment,
The circuit includes：
First operational amplification circuit, for anti-phase amplify and be superimposed first AC signal in first input signal
Bias voltage obtains the second input signal；
Second operational amplification circuit, for second input signal to be carried out into anti-phase amplification and is superimposed the second biased electrical
Pressure；
The input of output end series connection second operational amplification circuit of first operational amplification circuit.
Preferably, first operational amplification circuit also includes：First operational amplifier, first resistor, second resistance,
Three resistance, the 4th resistance, the first electric capacity and the second electric capacity；
The first resistor includes first end and the second end, and the first end is connected with signal input part, second end
With the first capacitance connection；
First electric capacity includes first end and the second end, and the first end is connected with the second end of the first resistor,
Second end is connected with the inverting input of the second resistance and first operational amplifier；
The second resistance includes first end and the second end, the second end of the first end and first electric capacity and described
The inverting input connection of first operational amplifier, second end is connected with the output end of first operational amplifier；
The 3rd resistor includes first end and the second end, and the first end connects supply voltage, second end and institute
State the 4th resistance, second electric capacity connects with the in-phase input end of first operational amplifier；
4th resistance includes first end and the second end, the second end of the first end and the 3rd resistor, described
Second electric capacity connects with the in-phase input end of first operational amplifier, second end and second capacitance connection and
Ground connection；
Second electric capacity includes first end and the second end, the second end of the first end and the 3rd resistor, described
The first end of 4th resistance connects with the in-phase input end of first operational amplifier, second end and the 4th resistance
The second end connect and be grounded.
The proportion of the first resistor and the second resistance is:1:1~1:10.
The Standard resistance range of the first resistor is 0~100K Ω, and the Standard resistance range of the second resistance is 0~100K Ω.
The 3rd resistor is equal with the 4th resistance, the resistance model of the 3rd resistor and the 4th resistance
Enclose for 10~1000K Ω.
Preferably, second operational amplification circuit includes：
Second operational amplifier, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 3rd electric capacity；
5th resistance includes first end and the second end, and the first end is connected with signal input part, second end
It is connected with the inverting input of the 6th resistance and second operational amplifier；
6th resistance includes first end and the second end, the second end of the first end and the 5th resistance and described
The inverting input connection of second operational amplifier, second end is connected with the output end of second operational amplifier；
7th resistance includes first end and the second end, and the first end connects supply voltage, second end and institute
State the 8th resistance, the 3rd electric capacity connects with the in-phase input end of second operational amplifier；
8th resistance includes first end and the second end, the second end of the first end and the 7th resistance, described
3rd electric capacity connects with the in-phase input end of second operational amplifier, and second end connects the 3rd electric capacity and connect
Ground；
3rd electric capacity includes first end and the second end, and the first end connects the second end of the 7th resistance, institute
The first end of the 8th resistance and the in-phase input end of second operational amplifier are stated, second end connects the 8th resistance
The second end and be grounded.
The proportion of 5th resistance and the 6th resistance is：1：1~1：0, and the 5th resistance with it is described
The ratio of 6th resistance is not 1:1 or 1:0.
The Standard resistance range of 5th resistance is 0~100K Ω, and the Standard resistance range of the 6th resistance is 0~100K Ω.
7th resistance is equal with the 8th resistance, the resistance model of the 7th resistance and the 8th resistance
Enclose for 10~1000K Ω.
The utility model embodiment is by using the direct current signal in first the first input signal of Capacitor apart, and with first
The AC compounent of the anti-phase amplification input signal of operational amplifier, in the in-phase input end access power supply electricity of the first operational amplifier
Pressure, a bias voltage is superimposed by AC signal of the electric resistance partial pressure to the first input signal, output signal is changed into first defeated
Enter the second input signal of the superposition of the anti-phase amplified signal of AC signal and bias direct current signal in signal, then again by second
Input signal, which accesses a see-saw circuit, believes the signal exchange that anti-phase amplification is finally given in an input signal again
Number process is anti-phase twice to amplify and is superimposed a bias direct current signal composite output signal.It is double to solve ac square wave signal
During polar signal, processing the problem of producing distorted signals under single supply electric power thus supplied, make ac square wave signal conversion in order to
Direct current signal, and AC compounent is exaggerated certain multiple and facilitates subsequent treatment, it ensure that saliva onset of ovulation detection device
Accuracy.
Brief description of the drawings
Fig. 1 is the circuit diagram for the signal amplification circuit that the utility model first embodiment provides.
Embodiment
To make the purpose of this utility model, technical scheme and advantage of greater clarity, with reference to embodiment
And referring to the drawings, the utility model is further described.It should be understood that these descriptions are merely illustrative, and do not really want
Limit the scope of the utility model.In addition, in the following description, the description to known features and technology is eliminated, to avoid not
Necessarily obscure concept of the present utility model.
It is the circuit diagram according to the signal amplification circuit of one embodiment of the utility model shown in Fig. 1；
As shown in figure 1, the circuit of signal amplification circuit provided by the utility model includes：First operational amplification circuit, use
In the AC signal in the first input signal anti-phase amplify and be superimposed the first bias voltage and obtain the second input signal.
In the utility model, the first operational amplification circuit is used to isolate the direct current signal in the first input signal, will
AC signal in first input signal is anti-phase to be amplified and gives superposition in the output signal after anti-phase amplification one bias direct current letter
Number.Example, the first operational amplification circuit in the present embodiment is the anti-phase operational amplification circuit of AC signal.
In the utility model, because the first input signal is bipolar signal, bipolar signal is in single supply power supply feelings
Distorted signals can be produced under condition, disturbs testing result of the present utility model, thus the purpose of this utility model be to solve it is this
Problem.Example, the first input signal in the present embodiment is ac square wave signal.
In the utility model, the first bias voltage is used for defeated after the anti-phase amplification of AC signal in the first input signal
Go out one bias direct current signal of superposition in signal, make the output signal conversion after the anti-phase amplification of AC signal in the first input signal
The direct current signal superposition for being VCC/2 for the AC signal after the anti-phase amplification of AC signal in the first input signal and voltage is answered
Close signal.Example, the first bias voltage is VCC/2 in the present embodiment, wherein, VCC is supply voltage.
In the utility model, the second input signal is the exchange after the anti-phase amplification of AC signal in the first input signal
The composite signal that signal and the direct current signal that voltage is VCC/2 are superimposed.
Second operational amplification circuit, for second input signal to be carried out into anti-phase amplification and is superimposed the second biased electrical
Pressure.
In the utility model, the second operational amplification circuit is used for the anti-phase AC signal amplified in the second input signal,
And to one bias direct current signal of superposition in the output signal after the anti-phase amplification of AC signal in the second input signal.Example
, the second operational amplification circuit in the present embodiment is anti-phase operational amplification circuit.
The input of output end series connection second operational amplification circuit of first operational amplification circuit.
In the utility model, the output end of the first operational amplification circuit and the input string of the second operational amplification circuit
Connection.Example, the input series connection of the output end and see-saw circuit of the AC signal see-saw circuit of the present embodiment.
First operational amplification circuit also includes：First operational amplifier, first resistor R1, second resistance R2, the 3rd
Resistance R3, the 4th resistance R4, the first electric capacity C1 and the second electric capacity C2.
In the utility model, the first operational amplifier is used to amplify input signal.Example, first in the present embodiment
Operational amplifier is LMV324 integrated operational amplifiers.
In the utility model, the first electric capacity C1 is used for the direct current signal isolated in the first input signal.
In the utility model, the second electric capacity C2 is used to filter noise reduction to supply voltage.
The first resistor R1 includes first end and the second end, and the first end is connected with signal input part, and described second
End and the first capacitance connection.
In the utility model, first resistor R1 and the first electric capacity C1 series connection.
The first electric capacity C1 includes first end and the second end, and the first end and the second end of the first resistor R1 connect
Connect, second end is connected with the second resistance R2 and first operational amplifier inverting input.
The second resistance R2 includes first end and the second end, the first end and the first electric capacity C1 the second end and
The inverting input connection of first operational amplifier, second end and the output end of first operational amplifier connect
Connect.
In the utility model, second resistance R2 and the first operational amplifier are in parallel, and the first electric capacity C1 is electric with second respectively
Hinder the inverting input series connection of R2 and the first operational amplifier.
The 3rd resistor R3 includes first end and the second end, and the first end connects supply voltage, second end with
The 4th resistance R4, the second electric capacity C2 connect with the in-phase input end of first operational amplifier.
In the utility model, 3rd resistor R3 respectively with the 4th resistance R4, the second electric capacity C2 and the first operational amplifier
In-phase input end series connection.
The 4th resistance R4 includes first end and the second end, and the first end connects the second of the 3rd resistor R3
The in-phase input end at end, the second electric capacity C2 and first operational amplifier, second end connect second electric capacity
C2 and it is grounded.
In the utility model, the 4th resistance R4 and the second electric capacity C2 are in parallel, the 4th resistance R4 and 3rd resistor R3 and the
The in-phase input end series connection of one operational amplifier.
The second electric capacity C2 includes first end and the second end, and the first end connects the second of the 3rd resistor R3
End, the in-phase input end of the first end of the 4th resistance R4 and first operational amplifier, described in the second end connection
4th resistance R4 the second end and it is grounded.
In the utility model, the second electric capacity C2 and the 4th resistance R4 are in parallel, the second electric capacity C2 and 3rd resistor R3 and the
The in-phase input end series connection of one operational amplifier.
Optionally, the proportion of first resistor and second resistance is:1:1~1:10.
Preferably, the Standard resistance range of the first resistor is 0~100K Ω, the Standard resistance range of the second resistance for 0~
100KΩ。
In the utility model, general knowledge as well known to those skilled in the art is that the resistance of first resistor and second resistance can not
For 0.
In the utility model, resistance R1 and resistance R2 ratio determine the anti-phase multiplication factor of the first operational amplifier
A1,Wherein, A1 represents the AC signal multiplication factor in ac square wave signal operational amplification circuit, and R2 is represented
Resistance R2 resistance, R1 represent resistance R1 resistance.
Optionally, 3rd resistor is equal with the 4th resistance, the Standard resistance range of 3rd resistor and the 4th resistance for 10~
1000KΩ。
In the utility model, R3 is equal to R4, and it is VCC/2's to be superimposed to one voltage of output end of the first operational amplifier
Direct current signal.
Second operational amplification circuit includes：
Second operational amplifier, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 3rd electric capacity
C3。
In the utility model, the second operational amplification circuit is used to the second input signal being amplified and to the second input
Output signal after signal inversion amplification is superimposed a bias direct current signal.Example, the second operation amplifier electricity in this example
Road is LMV324 integrated operational amplifier circuits.
In the utility model, the 3rd electric capacity C3 is used to filter noise reduction to supply voltage.
The 5th resistance R5 includes first end and the second end, and the first end is connected with signal input part, and described second
End is connected with the 6th resistance R6 and second operational amplifier inverting input.
The 6th resistance R6 includes first end and the second end, the first end and the 5th resistance R5 the second end and
The inverting input connection of second operational amplifier, second end and the output end of second operational amplifier connect
Connect.
In the utility model, the 6th resistance R6 and the second operational amplifier are in parallel, the 5th resistance R5 and the 6th resistance R6
Connected with the second operational amplifier inverting input.
The 7th resistance R7 includes first end and the second end, and the first end connects supply voltage, second end with
The 8th resistance R8, the 3rd electric capacity C3 connect with the in-phase input end of second operational amplifier.
In the utility model, the 7th resistance R7 respectively with the 8th resistance R8, the 3rd electric capacity C3 and the second operational amplifier
In-phase input end series connection.
The 8th resistance R8 includes first end and the second end, the first end and the 7th resistance R7 the second end,
The 3rd electric capacity C3 connects with the in-phase input end of second operational amplifier, and second end connects the 3rd electric capacity
C3 and it is grounded.
In the utility model, the 8th resistance R8 and the 3rd electric capacity C3 are in parallel, with the 7th resistance R7 and the second operation amplifier
Device in-phase input end is connected.
The 3rd electric capacity C3 includes first end and the second end, and the first end connects the second of the 7th resistance R7
End, the in-phase input end of the first end of the 8th resistance R8 and second operational amplifier, described in the second end connection
8th resistance R8 the second end and it is grounded.
In the utility model, the 3rd electric capacity C3 and the 8th resistance R8 are in parallel, the 3rd electric capacity C3 and the 7th resistance R7 and the
The in-phase input end series connection of two operational amplifiers.
Optionally, the proportion of the 5th resistance and the 6th resistance is：1：1~1：0, and the 5th resistance
Ratio with the 6th resistance is not 1:1 or 1:0.
In the utility model, when the 5th resistance and the 6th point of ratio are 1:When 1, then the second operational amplification circuit does not have
Amplification, when the ratio of the 5th resistance and the 6th resistance is 1:When 0, the 6th resistance is 0, then the second operational amplification circuit
There is no amplification, so the ratio of the 5th resistance and the 6th resistance is not 1 yet:1 or 1:0.
Preferably, the Standard resistance range of the 5th resistance is 0~100K Ω, the Standard resistance range of the 6th resistance for 0~
100KΩ。
In the utility model, general knowledge as well known to those skilled in the art is that the resistance of the 5th resistance and the 6th resistance can not
For 0.
In the utility model, the 5th resistance R5 and the 6th resistance R6 ratio determine the anti-of the second operational amplification circuit
Phase multiplication factor A2,A2 represents the AC signal multiplication factor of see-saw circuit, and R5 represents resistance R5 resistance
Value, R6 represent resistance R6 resistance.
Optionally, the 7th resistance is equal with the 8th resistance, the Standard resistance range of the 7th resistance and the 8th resistance for 10~
1000KΩ。
In the utility model, R7 is equal to R8, and it is VCC/2's to be superimposed to one voltage of output end of the second operational amplifier
Direct current signal, wherein, VCC is supply voltage.
Mentality of designing of the present utility model is：
After the anti-phase operational amplification circuit of AC signal receives ac square wave signal, isolate ac square wave signal using electric capacity C1
In direct current signal, and with LMV324 rp-op amps it is anti-phase amplification ac square wave signal in AC signal, anti-
The in-phase input end access supply voltage VCC of phase operational amplifier, by resistance R3 and R4 partial pressure, because R3 and R4 resistance phases
Deng, thus the partial pressure value of in-phase input end access is VCC/2, therefore it has been superimposed a voltage to exchange amplified signal in output end
For VCC/2 direct current signal, the anti-phase operational amplification circuit of AC signal is set to obtain output signal to exchange anti-phase amplified signal and electricity
The composite signal of the direct current signal for VCC/2 is pressed, wherein electric capacity C2 is connected to LMV324 in-phase input end, to in-phase input end
Voltage play a part of filter noise reduction.
The AC signal multiplication factor of ac square wave signal operational amplification circuit is：
The relation of AC signal input and output is in ac square wave signal operational amplification circuit：
Wherein, A1 represents the AC signal multiplication factor in ac square wave signal operational amplification circuit, and R2 represents resistance R2
Resistance, R1 represents resistance R1 resistance, and Y1 represents the output valve of AC signal in the anti-phase operational amplification circuit of AC signal, X1
Represent the input value of AC signal in the anti-phase operational amplification circuit of AC signal.
Because the output signal of the anti-phase operational amplification circuit of AC signal is the anti-phase amplified signal of exchange and voltage is VCC/2
Direct current signal composite signal, and because exchanging the ac square wave signal opposite in phase of anti-phase amplified signal and input signal,
So need to invert exchange amplified signal.
Because the output signal of the anti-phase operational amplification circuit of AC signal is the anti-phase amplified signal of exchange and voltage is VCC/2
Direct current signal composite signal, and it is AC signal to need amplify, so in the present embodiment, R7 in see-saw circuit
It is equal with R8, therefore the partial pressure value of the in-phase input end in LMV324 integrated operational amplifiers is also VCC/2, by the empty short original of circuit
Reason understands that the reverse inter-input-ing voltage of LMV324 integrated operational amplifiers is also VCC/2, therefore make LMV324 integrated operational amplifiers
The anti-phase amplification of AC signal, finally obtain by the ac square wave signal identical in the phase and input signal amplified twice
AC signal and voltage are the composite signal of VCC/2 direct current signal.
The AC signal multiplication factor of see-saw circuit is：
See-saw circuit AC signal inputs is with the relation exported：
Wherein, A2 represents the AC signal multiplication factor of see-saw circuit, and R5 represents resistance R5 resistance, and R6 represents electricity
R6 resistance is hindered, Y2 represents the AC signal output valve of see-saw circuit, and X2 represents that see-saw circuit AC signal is defeated
Enter value.
The AC signal of signal amplification circuit inputs and the relation of output is:
Wherein, Y represents the output valve of signal amplification circuit, and X represents the input value of signal amplification circuit.
It should be appreciated that above-mentioned embodiment of the present utility model is used only for exemplary illustration or explains this reality
With new principle, without forming to limitation of the present utility model.Therefore, without departing from spirit and scope of the present utility model
In the case of any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the utility model.In addition,
The appended claims for the utility model are intended to fall into scope and border or this scope and border
Whole in equivalents changes and modifications example.
Claims (9)
1. a kind of signal amplification circuit for saliva onset of ovulation detection device, it is characterised in that the circuit includes：
First operational amplification circuit, for the AC signal in the first input signal to be carried out into anti-phase amplification and is superimposed the first biasing
Voltage obtains the second input signal；
Second operational amplification circuit, for second input signal to be carried out into anti-phase amplification and is superimposed the second bias voltage；
The input of output end series connection second operational amplification circuit of first operational amplification circuit.
2. circuit according to claim 1, it is characterised in that first operational amplification circuit also includes：First computing
Amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity and the second electric capacity；
The first resistor includes first end and the second end, and the first end is connected with signal input part, second end and the
One capacitance connection；
First electric capacity includes first end and the second end, and the first end is connected with the second end of the first resistor, described
Second end is connected with the inverting input of the second resistance and first operational amplifier；
The second resistance includes first end and the second end, the first end and the second end and described first of first electric capacity
The inverting input connection of operational amplifier, second end is connected with the output end of first operational amplifier；
The 3rd resistor includes first end and the second end, and the first end connects supply voltage, second end and described the
Four resistance, second electric capacity connect with the in-phase input end of first operational amplifier；
4th resistance includes first end and the second end, the second end of the first end and the 3rd resistor, described second
Electric capacity connects with the in-phase input end of first operational amplifier, second end and second capacitance connection and connects
Ground；
Second electric capacity includes first end and the second end, the second end of the first end and the 3rd resistor, the described 4th
The first end of resistance connects with the in-phase input end of first operational amplifier, and the of second end and the 4th resistance
Two ends connect and are grounded.
3. circuit according to claim 2, it is characterised in that the proportion of the first resistor and the second resistance
For:1:1~1:10.
4. circuit according to claim 3, it is characterised in that the Standard resistance range of the first resistor is 0~100K Ω, institute
The Standard resistance range for stating second resistance is 0~100K Ω.
5. circuit according to claim 2, it is characterised in that the 3rd resistor is equal with the 4th resistance,
The Standard resistance range of the 3rd resistor and the 4th resistance is 10~1000K Ω.
6. circuit according to claim 1, it is characterised in that second operational amplification circuit includes：
Second operational amplifier, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 3rd electric capacity；
5th resistance includes first end and the second end, and the first end is connected with signal input part, second end and institute
The inverting input that the 6th resistance is stated with second operational amplifier connects；
6th resistance includes first end and the second end, the first end and the second end and described second of the 5th resistance
The inverting input connection of operational amplifier, second end is connected with the output end of second operational amplifier；
7th resistance includes first end and the second end, and the first end connects supply voltage, second end and described the
Eight resistance, the 3rd electric capacity connect with the in-phase input end of second operational amplifier；
8th resistance includes first end and the second end, the second end of the first end and the 7th resistance, the described 3rd
Electric capacity connects with the in-phase input end of second operational amplifier, and second end connects the 3rd electric capacity and is grounded；
3rd electric capacity includes first end and the second end, and the first end connects the second end of the 7th resistance, described the
The in-phase input end of the first end of eight resistance and second operational amplifier, second end connect the of the 8th resistance
Two ends and it is grounded.
7. circuit according to claim 6, it is characterised in that the proportion of the 5th resistance and the 6th resistance
For：1：1~1：0, and the ratio of the 5th resistance and the 6th resistance is not 1:1 or 1:0.
8. circuit according to claim 7, it is characterised in that the Standard resistance range of the 5th resistance is 0~100K Ω, institute
The Standard resistance range for stating the 6th resistance is 0~100K Ω.
9. circuit according to claim 6, it is characterised in that the 7th resistance and the 8th resistance are equal,
The Standard resistance range of 7th resistance and the 8th resistance is 10~1000K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720581869.9U CN206878783U (en) | 2017-05-23 | 2017-05-23 | A kind of signal amplification circuit for saliva onset of ovulation detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720581869.9U CN206878783U (en) | 2017-05-23 | 2017-05-23 | A kind of signal amplification circuit for saliva onset of ovulation detection device |
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| Publication Number | Publication Date |
|---|---|
| CN206878783U true CN206878783U (en) | 2018-01-12 |
Family
ID=61339239
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720581869.9U Active CN206878783U (en) | 2017-05-23 | 2017-05-23 | A kind of signal amplification circuit for saliva onset of ovulation detection device |
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| Country | Link |
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| CN (1) | CN206878783U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768380A (en) * | 2018-08-24 | 2018-11-06 | 唐智科技湖南发展有限公司 | A kind of modulate circuit of sensor |
-
2017
- 2017-05-23 CN CN201720581869.9U patent/CN206878783U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768380A (en) * | 2018-08-24 | 2018-11-06 | 唐智科技湖南发展有限公司 | A kind of modulate circuit of sensor |
| CN108768380B (en) * | 2018-08-24 | 2023-10-13 | 唐智科技湖南发展有限公司 | Conditioning circuit of sensor |
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