CN105030254B - Apparatus for frequency conversion, method and BOLD contrast with temperature compensation characteristic - Google Patents
Apparatus for frequency conversion, method and BOLD contrast with temperature compensation characteristic Download PDFInfo
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- CN105030254B CN105030254B CN201510369161.2A CN201510369161A CN105030254B CN 105030254 B CN105030254 B CN 105030254B CN 201510369161 A CN201510369161 A CN 201510369161A CN 105030254 B CN105030254 B CN 105030254B
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Abstract
The invention discloses a kind of apparatus for frequency conversion with temperature compensation characteristic, method and BOLD contrast, including photodiode, oscillator, trans-impedance amplifier, trsanscondutance amplifier and current subtractor；Photodiode is respectively the first photodiode for receiving optical signal and the second photodiode for not receiving optical signal；Trans-impedance amplifier is respectively the first trans-impedance amplifier and the second trans-impedance amplifier；Trsanscondutance amplifier is respectively the first trsanscondutance amplifier and the second trsanscondutance amplifier；The output end of first photodiode connects the first trsanscondutance amplifier by the first trans-impedance amplifier, and the output end of the second photodiode connects the second trsanscondutance amplifier by the second trans-impedance amplifier；The output end of first trsanscondutance amplifier and the second trsanscondutance amplifier connects current subtractor input respectively；The input of the output end connection oscillator of current subtractor.Influence of the energy compensation temperature of the invention to photodiode dark current, ensure the precision of photoelectric conversion device.
Description
Technical field
The present invention relates to photoelectric conversion technique field, more particularly to a kind of light frequency converting means with temperature compensation characteristic
Put, method and BOLD contrast.
Background technology
Photoelectric technology is a kind of new and high technology for being combined traditional optical technology with modern electronic technology, is turned with photoelectricity
Change the photoelectric conversion technique that circuit is core and be widely applied to military affairs, industry, agricultural, environmental science, medical treatment and space flight
Deng numerous areas, so-called opto-electronic conversion is the device based on semi-conducting material photodiode, by that will be irradiated in photoelectricity
Luminous flux knots modification is converted to corresponding current signal on diode, is entering one by subsequent conditioning circuits such as preposition amplification, main amplifications
Step is optimized for useful signal, so that subsequent conditioning circuit is handled signal.Apparatus for frequency conversion is a kind of opto-electronic conversion dress
Put, the pulse signal of corresponding frequencies can be produced according to the luminous intensity detected, is widely used in the medicine equipments such as BOLD contrast.
Most of low side BOLD contrast is made up of discrete device in the market, such as by photodiode, sense amplifier,
ADC/DAC, reference voltage stabilizing source, microprocessor and LED display and driving etc. are formed, this big power consumption of BOLD contrast volume
Height, and the uniformity of precision is difficult to ensure that.High-end BOLD contrast instead of photodiode using light sensor chip, some
Also the dedicated devices such as frequency are turned using light.Overall development trend is by multiple analog functional modules and photoelectric sensor progress
It is integrated, finally realize compact, light, power saving BOLD contrast product.But at present also not photoelectric sensor, small-signal collection,
What the modules such as analog-to-digital conversion integrated is exclusively used in the Photoelectric Detection simulation integrated chip of BOLD contrast.Wherein light frequency conversion electricity
Road is one of key component in Photoelectric Detection simulation integrated chip.Light frequency change-over circuit make use of photodiode to believe light
Number it is converted into current signal, but the dark current part in photodiode output is affected by temperature larger, therefore have impact on optical frequency
The precision of rate change-over circuit.
Therefore, in order to ensure conversion accuracy, light frequency change-over circuit has also needed to a mechanism and has been responsible for compensation temperature to light
The influence of electric diode dark current.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art and deficiency, there is provided a kind of light with temperature compensation characteristic
Frequency conversion apparatus, the influence of the device compensation temperature to photodiode dark current, ensure the precision of photoelectric conversion device.
It is a second object of the invention to provide a kind of pass through the above-mentioned apparatus for frequency conversion with temperature compensation characteristic
The light frequency conversion method of realization.
A kind of it is a third object of the invention to provide BOLD contrast.
The first object of the present invention is achieved through the following technical solutions：A kind of light frequency conversion with temperature compensation characteristic
Device, including photodiode and oscillator, in addition to trans-impedance amplifier, trsanscondutance amplifier and current subtractor；
The number of the photodiode is two, respectively receives optical signal and produces corresponding current signal according to luminous intensity
The first photodiode D1 and do not receive optical signal according to temperature produce correlated current signal the second photodiode D2；
The number of the trans-impedance amplifier is two, respectively the first trans-impedance amplifier and the second trans-impedance amplifier；
The number of the trsanscondutance amplifier is two, respectively the first trsanscondutance amplifier and the second trsanscondutance amplifier；
The output end of the first photodiode D1 connects the first trsanscondutance amplifier by the first trans-impedance amplifier, described
Second photodiode D2 output end connects the second trsanscondutance amplifier by the second trans-impedance amplifier；First trsanscondutance amplifier and
The output end of second trsanscondutance amplifier connects two inputs of current subtractor respectively；The output end connection shake of current subtractor
Swing the input of device.
Preferably, first trans-impedance amplifier includes resistance R1 and operational amplifier A 1；First photodiode D1's
Plus earth, negative electrode are connected with the inverting input of the operational amplifier A 1；The inverting input of the operational amplifier A 1
Connected by resistance R1 with the output end of operational amplifier A 1, the in-phase input end ground connection of operational amplifier A 1；Operational amplifier
A1 output end connects the input of the first trsanscondutance amplifier as the output end of the first trans-impedance amplifier；
Second trans-impedance amplifier includes resistance R2 and operational amplifier A 2；Second photodiode D2 anode connects
Ground, negative electrode are connected with the inverting input of the operational amplifier A 2；The inverting input of the operational amplifier A 2 passes through electricity
Resistance R2 connects with the output end of operational amplifier A 2, the in-phase input end ground connection of operational amplifier A 2；Operational amplifier A 2 it is defeated
Go out the input that end connects the second trsanscondutance amplifier as the output end of the second trans-impedance amplifier.
Preferably, first trsanscondutance amplifier includes operational amplifier A 3, resistance R3 and PMOS P1, described first across
The output end concatenation operation amplifier A3 of impedance amplifier inverting input, the output end connection PMOS P1 of operational amplifier A 3
Grid, the in-phase input end connection PMOS P1 of operational amplifier A 3 drain electrode, PMOS P1 drain electrode connect by resistance R3
Ground, PMOS P1 source electrode connect power supply；The output end of operational amplifier A 3 connects electricity as the output end of the first trsanscondutance amplifier
Flow one of input of subtracter；
Second trsanscondutance amplifier includes operational amplifier A 4, resistance R4 and PMOS P2, and described second amplifies across resistance
The output end concatenation operation amplifier A4 of device inverting input, the output end connection PMOS P2 of operational amplifier A 4 grid
Pole, the in-phase input end connection PMOS P2 of operational amplifier A 4 drain electrode, PMOS P2 drain electrode are grounded by resistance R4,
PMOS P2 source electrode connects power supply；The output end of operational amplifier A 4 subtracts as the output end connection electric current of the second trsanscondutance amplifier
Another input of musical instruments used in a Buddhist or Taoist mass.
Preferably, the current subtractor includes PMOS P3, PMOS P4, NMOS tube N1, NMOS tube N2 and NMOS tube
N3, the output end connection PMOS P3 of first trsanscondutance amplifier grid, the output end connection of the second trsanscondutance amplifier
PMOS P4 grid；
PMOS P3 source class and PMOS P4 source class connect power supply；
PMOS P3 drain electrode connects NMOS tube N2 drain electrode, NMOS tube N3 drain electrode and NMOS tube N3 grid respectively
Pole；PMOS P4 drain electrode connects NMOS tube N1 drain electrode and NMOS tube N1 grid respectively；NMOS tube N1 grid and NMOS
Pipe N2 grid connection, the source grounding of NMOS tube N1 source electrode, NMOS tube N2 source electrode and NMOS tube N3, wherein NMOS
Pipe N3 grid connects the input of oscillator as the output end of current subtractor.
Preferably, the oscillator include PMOS P5, PMOS P6, PMOS P7, NMOS tube N4, NMOS tube N5,
NMOS tube N6, electric capacity C1, electric capacity C2, phase inverter I1, phase inverter I2, phase inverter I3, phase inverter I4 and phase inverter I5；
The output end of NMOS tube N4 grid connection current subtractor, PMOS P5 and PMOS P6 source electrode connect electricity respectively
Source, the grid of PMOS P5 drain and gate respectively with PMOS P6 are connected, PMOS P5 drain electrode connection NMOS tube N4's
Drain electrode, NMOS tube N4 source ground；PMOS P6 drain electrode connect respectively NMOS tube N5 drain electrode, NMOS tube N5 grid and
NMOS tube N6 grid, NMOS tube N5 source ground；
PMOS P7 grid connection PMOS P6 grid, PMOS P7 drain electrode connect with NMOS tube N6 drain electrode,
Phase inverter I1 input connection PMOS P7 drain electrode, phase inverter I1 output end connection phase inverter I2's and phase inverter I3 is defeated
Enter end, phase inverter I2 output end is connected instead respectively by electric capacity C1 connection PMOSs P7 drain electrode, phase inverter I3 output end
Phase device I4 and phase inverter I5 input, phase inverter I4 output end connection PMOS P7 and NMOS tube N6 source electrode, PMOS
P7 drain electrode is grounded by electric capacity C2；Phase inverter I5 output end exports the pulse letter of corresponding frequencies as the output end of oscillator
Number.
The second object of the present invention is achieved through the following technical solutions：It is a kind of to have temperature-compensating special based on described above
Property the light frequency conversion method realized of apparatus for frequency conversion, step is as follows：
S1, the first photodiode D1 receive optical signal and convert thereof into corresponding current signal according to luminous intensity, so
After send the first trans-impedance amplifier to；First photodiode D2 does not receive optical signal, and correlated current signal is produced according to temperature,
It is then transferred to the second trans-impedance amplifier；
After S2, the first trans-impedance amplifier receive current signal, current signal is converted into voltage signal, is then transferred to
First trsanscondutance amplifier；After second trans-impedance amplifier receives current signal, current signal is converted into voltage signal, Ran Houchuan
Give the second trsanscondutance amplifier；
After S3, the first trsanscondutance amplifier receive voltage signal, voltage signal is proportionally converted into current signal, and
And send one of input of current subtractor to, after the second trsanscondutance amplifier receives voltage signal, proportionally will
Voltage signal is converted into current signal, and sends another input of current subtractor to；
The current signal that S4, current subtractor receive two inputs carries out subtracting each other processing, is obtained after subtracting each other processing
The current signal of temperature-compensating, it is then transported on being given to oscillator；
The temperature-compensated current signal that S5, oscillator export according to current subtractor produces the pulse signal of corresponding frequencies.
Preferably, the current signal that the first trsanscondutance amplifier exports in the step S3 passes through current subtractor PMOS P3
Grid be input in current subtractor；The current signal of the second trsanscondutance amplifier output passes through current subtractor PMOS
P4 grid is input in current subtractor.
Preferably, in the step S4, the electric current that current subtractor is compensated by NMOS tube N3 grid output temperature is believed
Number arrive oscillator input.
Preferably, in the step S5, grid input temp compensating current signal that the oscillator passes through NMOS tube N4.
The third object of the present invention is achieved through the following technical solutions：A kind of BOLD contrast, including the described above temperature of having
Spend the apparatus for frequency conversion of compensation characteristic.
The present invention is had the following advantages relative to prior art and effect：
Apparatus of the present invention include two photodiodes, wherein the first photodiode is used to receive optical signal, and root
Corresponding current signal is produced according to luminous intensity, the second photodiode produces correlated current not receive optical signal, according only to temperature
Signal, current signal caused by two photodiodes corresponds to respectively is sent to two trans-impedance amplifiers progress impedance conversion, leads to
Cross two trans-impedance amplifiers and the current signal that two photodiodes export is converted into voltage signal, be then respectively transmitted to again
In two trsanscondutance amplifiers, the voltage signal of input is proportionally converted into current signal by two trsanscondutance amplifiers respectively, so
Two inputs of current subtractor are respectively transmitted to afterwards, current subtractor carries out subtracting each other processing to the two paths of signals of input, with
Photodiode is subtracted because current signal caused by temperature, the current signal by temperature-compensating is obtained, by temperature-compensating
Current signal is input in oscillator, and oscillator produces the pulse signal of corresponding frequencies according to the size of input current, to realize
Light frequency conversion with temperature-compensating, influence of the compensation temperature to photodiode dark current, ensures photoelectric conversion device
Precision.
Brief description of the drawings
Fig. 1 is the structure composition block diagram of apparatus for frequency conversion of the present invention.
Fig. 2 is the circuit theory diagrams of apparatus for frequency conversion of the present invention.
Fig. 3 is the pulse signal figure of apparatus for frequency conversion output of the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in figure 1, present embodiment discloses a kind of apparatus for frequency conversion with temperature compensation characteristic, including photoelectricity
Diode, trans-impedance amplifier, trsanscondutance amplifier, current subtractor and oscillator；
The number of photodiode is two, respectively receives optical signal produces corresponding current signal according to luminous intensity the
One photodiode D1 and do not receive optical signal according to temperature produce correlated current signal the second photodiode D2；I.e. first
Photodiode D1 is used to receive optical signal, and the second photodiode does not receive optical signal, only produces the electric current for having light with temperature
Signal.
The number of trans-impedance amplifier is two, respectively the first trans-impedance amplifier 11 and the second trans-impedance amplifier 12；
The number of trsanscondutance amplifier is two, respectively the first trsanscondutance amplifier 21 and the second trsanscondutance amplifier 22；
First photodiode D1 output end by the first trans-impedance amplifier 11 connect the first trsanscondutance amplifier 21, second
Photodiode D2 output end connects the second trsanscondutance amplifier 22 by the second trans-impedance amplifier 12；First trsanscondutance amplifier 21
Connect two inputs of current subtractor 3 respectively with the output end of the second trsanscondutance amplifier 22；The output end of current subtractor 3
Connect the input of oscillator 4.
As shown in Fig. 2 the first trans-impedance amplifier 11 includes resistance R1 and operational amplifier A 1；First photodiode D1's
Plus earth, negative electrode are connected with the inverting input of the operational amplifier A 1；The inverting input of operational amplifier A 1 passes through
Resistance R1 connects with the output end of operational amplifier A 1, the in-phase input end ground connection of operational amplifier A 1；Operational amplifier A 1
Output end connects the input of the first trsanscondutance amplifier 21 as the output end of the first trans-impedance amplifier 11；Put by first across resistance
The first photodiode D1 electric currents exported are carried out being converted into voltage signal by big device 11.The electricity of first trans-impedance amplifier 11 output
Press signal V11For：
V11=I11*R1；
Wherein I11For the electric current of the first photodiode D1 outputs.
Second trans-impedance amplifier 12 includes resistance R2 and operational amplifier A 2；Second photodiode D2 plus earth,
Negative electrode is connected with the inverting input of the operational amplifier A 2；The inverting input of operational amplifier A 2 passes through resistance R2 and fortune
Calculate amplifier A2 output end connection, the in-phase input end ground connection of operational amplifier A 2；The output end conduct of operational amplifier A 2
The output end of second trans-impedance amplifier 12 connects the input of the second trsanscondutance amplifier 22；By the second trans-impedance amplifier 12 by
The electric current of two photodiode D1 outputs carries out being converted into voltage signal.The voltage signal V of second trans-impedance amplifier 12 output12
For：
V12=I12*R2；
Wherein I12For the electric current of the second photodiode D2 outputs.
First trsanscondutance amplifier 21 includes operational amplifier A 3, resistance R3 and PMOS P1, the first trans-impedance amplifier 11
Output end concatenation operation amplifier A3 inverting input, the output end connection PMOS P1 of operational amplifier A 3 grid, fortune
Amplifier A3 in-phase input end connection PMOS P1 drain electrode is calculated, PMOS P1 drain electrode is grounded by resistance R3, PMOS
P1 source electrode connects power supply；The output end of operational amplifier A 3 connects current subtractor as the output end of the first trsanscondutance amplifier 21
One of input；The voltage signal that first trans-impedance amplifier exports proportionally is turned by the first trsanscondutance amplifier 21
Change current signal into.The conversion proportion relation of wherein the first trsanscondutance amplifier 21 is as follows：
I21=V11/R3；
Wherein V11For the voltage signal of the first trans-impedance amplifier output.
Second trsanscondutance amplifier 22 includes operational amplifier A 4, resistance R4 and PMOS P2, the second trans-impedance amplifier 21
Output end concatenation operation amplifier A4 inverting input, the output end connection PMOS P2 of operational amplifier A 4 grid, fortune
Amplifier A4 in-phase input end connection PMOS P2 drain electrode is calculated, PMOS P2 drain electrode is grounded by resistance R4, PMOS
P2 source electrode connects power supply；The output end of operational amplifier A 4 connects current subtractor as the output end of the second trsanscondutance amplifier 22
3 another input.The voltage signal the second trans-impedance amplifier 12 exported by the second trsanscondutance amplifier 22 is proportionally
It is converted into current signal.
The conversion proportion relation of wherein the first trsanscondutance amplifier 21 is as follows：
I22=V12/R4；
Wherein V12For the voltage signal of the second trans-impedance amplifier output.
Current subtractor 3 includes PMOS P3, PMOS P4, NMOS tube N1, NMOS tube N2 and NMOS tube N3；First mutual conductance
The output end connection PMOS P3 of amplifier 21 grid, PMOS P3 obtain the first mutual conductance by mirror image PMOS P1 electric current
The current signal that amplifier 21 exports；The output end connection PMOS P4 of second trsanscondutance amplifier 22 grid, PMOS P4 lead to
The electric current for crossing mirror image PMOS P2 obtains the current signal of the second trsanscondutance amplifier 22 output；
PMOS P3 source class and PMOS P4 source class connect power supply；
PMOS P3 drain electrode connects NMOS tube N2 drain electrode, NMOS tube N3 drain electrode and NMOS tube N3 grid respectively
Pole；PMOS P4 drain electrode connects NMOS tube N1 drain electrode and NMOS tube N1 grid respectively；NMOS tube N1 grid and NMOS
Pipe N2 grid connection, the source grounding of NMOS tube N1 source electrode, NMOS tube N2 source electrode and NMOS tube N3, wherein NMOS
Pipe N3 grid connects the input of oscillator 4 as the output end of current subtractor 3.Two be input in current subtractor 3
Road current signal is exported by the NMOS tube N3 of current subtractor 3 grid, led to after current subtractor carries out subtracting each other processing
Overcurrent subtracter 3 gets the current signal after two paths of signals subtracts each other, i.e., by subtracting each other processing compensation temperature to the pole of photoelectricity two
The influence of pipe dark current, obtain the current signal after temperature-compensating.
In the present embodiment current subtractor 3, PMOS P3 drain electrode and NMOS tube N2 and drain electrode and NMOS tube N3 drain electrode
Connect together, therefore the electric current part for flowing through PMOS P3 flows into NMOS tube N2, another part flows into NMOS tube N3.And NMOS tube
N1 and PMOS P4 is in same branch road, and the electric current for flowing through them is equal；NMOS tube N2 mirror image NMOS tubes N1 electric current again, that is, flow
The electric current for crossing NMOS tube N2 is equal with the electric current for flowing through PMOS P4.So in the electric current that PMOS P3 flows through with PMOS P4
After a size of current identical part is flowed away by NMOS tube N2, remaining inflow NMOS tube N3, so as to realize current subtraction
Purpose.
Oscillator 4 includes PMOS P5, PMOS P6, PMOS P7, NMOS tube N4, NMOS tube N5, NMOS tube N6, electric capacity
C1, electric capacity C2, phase inverter I1, phase inverter I2, phase inverter I3, phase inverter I4 and phase inverter I5；
The output end of NMOS tube N4 grid connection current subtractor 3, PMOS P5 and PMOS P6 source electrode connect respectively
Power supply, the grid of PMOS P5 drain and gate respectively with PMOS P6 are connected, PMOS P5 drain electrode connection NMOS tube N4
Drain electrode, NMOS tube N4 source ground；PMOS P6 drain electrode connects NMOS tube N5 drain electrode, NMOS tube N5 grid respectively
With NMOS tube N6 grid, NMOS tube N5 source ground；
PMOS P7 grid connection PMOS P6 grid, PMOS P7 drain electrode connect with NMOS tube N6 drain electrode,
Phase inverter I1 input connection PMOS P7 drain electrode, phase inverter I1 output end connection phase inverter I2's and phase inverter I3 is defeated
Enter end, phase inverter I2 output end is connected instead respectively by electric capacity C1 connection PMOSs P7 drain electrode, phase inverter I3 output end
Phase device I4 and phase inverter I5 input, phase inverter I4 output end connection PMOS P7 and NMOS tube N6 source electrode, PMOS
P7 drain electrode is grounded by electric capacity C2；Phase inverter I5 output end exports the pulse of corresponding frequencies as the output end of oscillator 4
Signal.It is illustrated in figure 3 the pulse signal of the output of the present embodiment oscillator 4.
In the present embodiment oscillator 4, it is assumed that oscillator 4 now exports high level, i.e., the high electricity of now phase inverter I4 outputs
Flat, phase inverter I1 inputs are low potential.Now PMOS P7 is turned on, and NMOS tube N6 cut-offs, electric capacity C1 and electric capacity C2 pass through
PMOS P7 input currents charge, and phase inverter I1 input terminal potentials constantly raise.When phase inverter I1 input current potentials increase to over
After phase inverter I1 forward threshold voltage, phase inverter I1, phase inverter I2, phase inverter I3, phase inverter I4 and phase inverter I5 output hairs
Raw upset, oscillator 4 export low level.I.e. now phase inverter I4 exports low level, and phase inverter I1 inputs are high potential.Now
PMOS P7 ends, NMOS tube N6 conductings, and electric capacity C1 and electric capacity C2 flow out current discharge, phase inverter I1 inputs by NMOS tube N6
Terminal potential constantly reduces.After phase inverter I1 inputs current potential reduces the reverse threshold voltage more than phase inverter I1, phase inverter I1,
Phase inverter I2, phase inverter I3, phase inverter I4 and phase inverter I5 outputs are overturn, and oscillator 4 exports high level again, enters again
Enter the above-mentioned cycle, so as to produce concussion, output pulse signal.The concussion frequency for the pulse signal that oscillator 4 obtains in the present embodiment
Rate fclkFor：
Wherein Vt,rFor phase inverter I1 forward threshold voltages, Vt,fFor the reverse threshold voltages of phase inverter I1, I4For phase inverter I4
Input voltage size, VDDFor supply voltage.
The present embodiment also discloses a kind of optical frequency realized by the above-mentioned apparatus for frequency conversion with temperature compensation characteristic
Rate conversion method, step are as follows：
S1, the first photodiode D1 receive optical signal and convert thereof into corresponding current signal according to luminous intensity, so
After send the first trans-impedance amplifier to；First photodiode D2 does not receive optical signal, and correlated current signal is produced according to temperature,
It is then transferred to the second trans-impedance amplifier；
After S2, the first trans-impedance amplifier receive current signal, current signal is converted into voltage signal, is then transferred to
First trsanscondutance amplifier；After second trans-impedance amplifier receives current signal, current signal is converted into voltage signal, Ran Houchuan
Give the second trsanscondutance amplifier；
The voltage signal V that the first trans-impedance amplifier 11 exports in the present embodiment11For：
V11=I11*R1；
Wherein I11For the electric current of the first photodiode D1 outputs.
The voltage signal V that the second trans-impedance amplifier 12 exports in the present embodiment12For：
V12=I12*R2；
Wherein I12For the electric current of the second photodiode D2 outputs.
After S3, the first trsanscondutance amplifier receive voltage signal, voltage signal is proportionally converted into current signal, and
And send one of input of current subtractor to, after the second trsanscondutance amplifier receives voltage signal, proportionally will
Voltage signal is converted into current signal, and sends another input of current subtractor to；The first mutual conductance is put in this step
The current signal of big device output is input in current subtractor by current subtractor PMOS P3 grid；Second mutual conductance is amplified
The current signal of device output is input in current subtractor by current subtractor PMOS P4 grid.
The conversion proportion that the voltage signal of the first trsanscondutance amplifier is converted into current signal in the present embodiment is：
I21=V11/R3；
Wherein V11For the voltage signal of the first trans-impedance amplifier output.
The conversion proportion that the voltage signal of the second trsanscondutance amplifier is converted into current signal in the present embodiment is：
I22=V12/R4；
Wherein V12For the voltage signal of the second trans-impedance amplifier output.
The current signal that S4, current subtractor receive two inputs carries out subtracting each other processing, is obtained after subtracting each other processing
The current signal of temperature-compensating, it is then transported on being given to oscillator；Current subtractor is defeated by NMOS tube N3 grid in this step
Go out the current signal of temperature-compensating to the input of oscillator.
The temperature-compensated current signal that S5, oscillator export according to current subtractor produces the pulse signal of corresponding frequencies.
The grid input temp compensating current signal that oscillator passes through NMOS tube N4 in this step.The arteries and veins that oscillator obtains in the present embodiment
Rush the concussion frequency f of signalclkFor：
Wherein Vt,rFor phase inverter I1 forward threshold voltages, V in oscillatort,fFor the reverse threshold value electricity of phase inverter I1 in oscillator
Pressure, I4For the input voltage size of phase inverter I4 in oscillator, VDDFor supply voltage.
The present embodiment also discloses a kind of BOLD contrast, including the above-mentioned apparatus for frequency conversion with temperature compensation characteristic.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of apparatus for frequency conversion with temperature compensation characteristic, including photodiode and oscillator, it is characterised in that
Also include trans-impedance amplifier, trsanscondutance amplifier and current subtractor；
The number of the photodiode is two, respectively receives optical signal produces corresponding current signal according to luminous intensity the
One photodiode D1 and do not receive optical signal according to temperature produce correlated current signal the second photodiode D2；
The number of the trans-impedance amplifier is two, respectively the first trans-impedance amplifier and the second trans-impedance amplifier；
The number of the trsanscondutance amplifier is two, respectively the first trsanscondutance amplifier and the second trsanscondutance amplifier；
The output end of the first photodiode D1 by the first trans-impedance amplifier connect the first trsanscondutance amplifier, described second
Photodiode D2 output end connects the second trsanscondutance amplifier by the second trans-impedance amplifier；First trsanscondutance amplifier and second
The output end of trsanscondutance amplifier connects two inputs of current subtractor respectively；The output end connection oscillator of current subtractor
Input.
2. the apparatus for frequency conversion according to claim 1 with temperature compensation characteristic, it is characterised in that described first
Trans-impedance amplifier includes resistance R1 and operational amplifier A 1；First photodiode D1 plus earth, negative electrode and the computing
Amplifier A1 inverting input connection；The inverting input of the operational amplifier A 1 passes through resistance R1 and operational amplifier A 1
Output end connection, operational amplifier A 1 in-phase input end ground connection；The output end of operational amplifier A 1 is put as first across resistance
The output end of big device connects the input of the first trsanscondutance amplifier；
Second trans-impedance amplifier includes resistance R2 and operational amplifier A 2；Second photodiode D2 plus earth, it is cloudy
Pole is connected with the inverting input of the operational amplifier A 2；The inverting input of the operational amplifier A 2 by resistance R2 and
The output end connection of operational amplifier A 2, the in-phase input end ground connection of operational amplifier A 2；The output end of operational amplifier A 2 is made
The input of the second trsanscondutance amplifier is connected for the output end of the second trans-impedance amplifier.
3. the apparatus for frequency conversion according to claim 1 with temperature compensation characteristic, it is characterised in that described first
Trsanscondutance amplifier includes operational amplifier A 3, resistance R3 and PMOS P1, the output end connection fortune of first trans-impedance amplifier
Amplifier A3 inverting input is calculated, the output end of operational amplifier A 3 connects PMOS P1 grid, operational amplifier A 3
In-phase input end connection PMOS P1 drain electrode, PMOS P1 drain electrode are grounded by resistance R3, and PMOS P1 source electrode connects electricity
Source；The output end of operational amplifier A 3 connects one of input of current subtractor as the output end of the first trsanscondutance amplifier
End；
Second trsanscondutance amplifier includes operational amplifier A 4, resistance R4 and PMOS P2, second trans-impedance amplifier
Output end concatenation operation amplifier A4 inverting input, the output end connection PMOS P2 of operational amplifier A 4 grid, fortune
Amplifier A4 in-phase input end connection PMOS P2 drain electrode is calculated, PMOS P2 drain electrode is grounded by resistance R4, PMOS
P2 source electrode connects power supply；The output end of operational amplifier A 4 connects current subtractor as the output end of the second trsanscondutance amplifier
Another input.
4. the apparatus for frequency conversion according to claim 1 with temperature compensation characteristic, it is characterised in that the electric current
Subtracter includes PMOS P3, PMOS P4, NMOS tube N1, NMOS tube N2 and NMOS tube N3, first trsanscondutance amplifier
Output end connection PMOS P3 grid, the output end connection PMOS P4 of the second trsanscondutance amplifier grid；
PMOS P3 source class and PMOS P4 source class connect power supply；
PMOS P3 drain electrode connects NMOS tube N2 drain electrode, NMOS tube N3 drain electrode and NMOS tube N3 grid respectively；
PMOS P4 drain electrode connects NMOS tube N1 drain electrode and NMOS tube N1 grid respectively；NMOS tube N1 grid and NMOS tube N2
Grid connection, the source grounding of NMOS tube N1 source electrode, NMOS tube N2 source electrode and NMOS tube N3, wherein NMOS tube N3
Grid as current subtractor output end connect oscillator input.
5. the apparatus for frequency conversion according to claim 1 with temperature compensation characteristic, it is characterised in that the concussion
Device includes PMOS P5, PMOS P6, PMOS P7, NMOS tube N4, NMOS tube N5, NMOS tube N6, electric capacity C1, electric capacity C2, anti-
Phase device I1, phase inverter I2, phase inverter I3, phase inverter I4 and phase inverter I5；
The output end of NMOS tube N4 grid connection current subtractor, PMOS P5 and PMOS P6 source electrode connect power supply respectively,
Grid of the PMOS P5 drain and gate respectively with PMOS P6 is connected, PMOS P5 drain electrode connection NMOS tube N4 leakage
Pole, NMOS tube N4 source ground；PMOS P6 drain electrode connect respectively NMOS tube N5 drain electrode, NMOS tube N5 grid and
NMOS tube N6 grid, NMOS tube N5 source ground；
PMOS P7 grid connection PMOS P6 grid, PMOS P7 drain electrode connects with NMOS tube N6 drain electrode, anti-phase
Device I1 input connection PMOS P7 drain electrode, phase inverter I1 output end connection phase inverter I2 and phase inverter I3 input
End, by electric capacity C1 connection PMOSs P7 drain electrode, phase inverter I3 output end connects anti-phase respectively for phase inverter I2 output end
Device I4 and phase inverter I5 input, phase inverter I4 output end connection PMOS P7 and NMOS tube N6 source electrode, PMOS P7
Drain electrode be grounded by electric capacity C2；Phase inverter I5 output end exports the pulse letter of corresponding frequencies as the output end of oscillator
Number.
A kind of 6. light frequency conversion that apparatus for frequency conversion with temperature compensation characteristic based on described in claim 1 is realized
Method, it is characterised in that step is as follows：
S1, the first photodiode D1 receive optical signal and convert thereof into corresponding current signal, Ran Houchuan according to luminous intensity
Give the first trans-impedance amplifier；First photodiode D2 does not receive optical signal, produces correlated current signal according to temperature, then
Send the second trans-impedance amplifier to；
After S2, the first trans-impedance amplifier receive current signal, current signal is converted into voltage signal, is then transferred to first
Trsanscondutance amplifier；After second trans-impedance amplifier receives current signal, current signal is converted into voltage signal, is then transferred to
Second trsanscondutance amplifier；
After S3, the first trsanscondutance amplifier receive voltage signal, voltage signal is proportionally converted into current signal, and pass
One of input of current subtractor is given, after the second trsanscondutance amplifier receives voltage signal, proportionally by voltage
Signal is converted into current signal, and sends another input of current subtractor to；
The current signal that S4, current subtractor receive two inputs is carried out subtracting each other processing, and temperature is obtained after subtracting each other processing
The current signal of compensation, it is then transported on being given to oscillator；
The temperature-compensated current signal that S5, oscillator export according to current subtractor produces the pulse signal of corresponding frequencies.
7. light frequency conversion method according to claim 6, it is characterised in that the first trsanscondutance amplifier in the step S3
The current signal of output is input in current subtractor by current subtractor PMOS P3 grid；The second mutual conductance amplification
The current signal of device output is input in current subtractor by current subtractor PMOS P4 grid.
8. light frequency conversion method according to claim 6, it is characterised in that in the step S4, current subtractor leads to
The current signal of NMOS tube N3 grid output temperature compensation is crossed to the input of oscillator.
9. light frequency conversion method according to claim 6, it is characterised in that in the step S5, the oscillator leads to
Cross NMOS tube N4 grid input temp compensating current signal.
10. a kind of BOLD contrast, it is characterised in that including there is temperature compensation characteristic any one of claim 1 to 5
Apparatus for frequency conversion.
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| CN111803083A (en) * | 2019-04-12 | 2020-10-23 | 南京工业大学 | Noninvasive blood oxygen detection device based on perovskite light emitting diode |
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| US6701171B2 (en) * | 2000-03-31 | 2004-03-02 | Københavns Universitet | Method and apparatus for non-invasive detection of angiogenic and anti-angiogenic activity in living tissue |
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| GB2176962A (en) * | 1985-06-21 | 1987-01-07 | Stc Plc | Pinfet receiver |
| CN1404348A (en) * | 2001-08-24 | 2003-03-19 | 中国科学院力学研究所 | Automatic tracking package for pulse x-ray apparatus and its automatic tracking method |
| CN102331297A (en) * | 2010-07-13 | 2012-01-25 | 国民技术股份有限公司 | Ling intensity detection method and light intensity detection circuit |
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