CN103364614B - Self-adaptation wide-range current/voltage conversion equipment - Google Patents
Self-adaptation wide-range current/voltage conversion equipment Download PDFInfo
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Abstract
The present invention relates to a kind of self-adaptation wide-range current-to-voltage converting circuit read for current-output type detector front end.Be characterized in comprising the current signal I inputted with shielding respectively
inthe four tunnel input high speed commutation circuits connected, every road input high speed commutation circuit is successively with current-to-voltage converting circuit with exports high speed commutation circuit and be connected in series parallel with one another afterwards, then be connected with anti-phase amplification and voltage follower, the voltage signal that anti-phase amplification and voltage follower export is divided into three tunnels, one tunnel is that analog voltage exports, two-way connects control logic circuit respectively by high speed low threshold discriminator circuit and the high threshold discriminator circuit of high speed in addition, control logic circuit sends the switching that four road gear control signal correspondences control four tunnel input high speed commutation circuits and export high speed commutation circuit.It achieves input range robotization identification and handoff functionality, and circuit working is stablized, and conversion accuracy is high, and antijamming capability is strong, can realize high precision, low noise, the conversion of wide-range current/voltage.
Description
Technical field
The present invention relates to current-output type detector front end sensing technique field, especially relate to a kind of self-adaptation wide-range current-to-voltage converting circuit.
Background technology
Along with the development of accelerator art, for meeting the experiment demand of more multinuclear physics and cross discipline, the energy range that accelerator exports is increasing, also more and more higher to the requirement of quality of beam.Beam diagnostics is one of key link of accelerator system, bundle is examined in detector and is contained in a large number for beam profile monitoring, the weak current output type detector restrainting dizzy monitoring and emittance monitoring, as for the itemize ionization chamber of profile monitoring and multiwire proportional chamber, sweep device etc. for the silk restrainting dizzy and emittance measurement.The front-end electronics that current bundle examines system correlated current output type detector adopts impedance transformation method or Integral Transformation method to convert electric current to voltage signal usually, and the voltage that Integral Transformation method converts represents the total electrical charge in certain a period of time, real-time is poor, therefore higher to ageing requirement system all adopts impedance transformation method, is called current/voltage conversion (IVC).
For the low current signal of constantly change; traditional, fixing range current-to-voltage converting circuit major part has the processing capability in real time of 2 ~ 3 orders of magnitude; if when running into the current signal of more than 3 orders of magnitude, the range ability that system can process usually can be exceeded.Conventional treatment method takes discard portion compared with small-signal or the way compared with large-signal, or artificial removes the electronic system changing different range, greatly reduce precision and the accuracy of beam diagnostics system like this, add and adjust the bundle time, have impact on the utilization factor of accelerator, waste a large amount of manpowers, financial resources and time, simultaneously because needs staff removes more exchange device to scene, very easily occur personal security accident.Therefore the bundle that traditional, fixing range current-to-voltage converting circuit is difficult to when meeting high accuracy experiment examines requirement.
Summary of the invention
The object of the invention is to the poor real avoiding existing wide-range current signal sensing technique, the defect that cannot meet high accuracy experiment demand provides a kind of self-adaptation wide-range current/voltage conversion equipment, thus efficiently solves prior art Problems existing.
For achieving the above object, the technical scheme that the present invention takes is: described self-adaptation wide-range current/voltage conversion equipment, is characterized in comprising the current signal I inputted with shielding respectively
inthe four tunnel input high speed commutation circuits connected, every road input high speed commutation circuit is successively with current-to-voltage converting circuit with exports high speed commutation circuit and be connected in series parallel with one another afterwards, then be connected with anti-phase amplification and voltage follower, the voltage signal that anti-phase amplification and voltage follower export is divided into three tunnels, anti-phase amplification and voltage follower one tunnel export as analog voltage exports Vout, anti-phase amplification and the other two-way of voltage follower export and connect control logic circuit respectively by high speed low threshold discriminator circuit and the high threshold discriminator circuit of high speed, described current-to-voltage converting circuit comprises four gear intervals, four tunnel input high speed commutation circuit Zhong Mei road input high speed commutation circuits are controlled by control logic circuit with the switching action of corresponding output high speed commutation circuit.
Four described tunnel input high speed commutation circuit structures are identical, and four tunnel input high speed commutation circuit Zhong Mei road input high speed commutation circuits comprise a DMOS high-speed analog switch, two resistance and a quick phase inverter, input signal I
inhold with the Source of DMOS high-speed analog switch and be connected, the Body termination-5V voltage of DMOS high-speed analog switch, input signal I
inheld by the Source of DMOS pipe and enter, input signal I
inexport from Drain end under the control of Gate end, control signal Ctrl1, by after phase inverter B1, holds with the Gate of resistance R1 and R2 acting in conjunction control DMOS high-speed analog switch, and when Ctrl1 is low level, the Source end of M1 holds conducting, I with Drain
insignal exports from the Drain end of M1, when Ctrl1 is high level, the Source end of M1 is held with Drain and is disconnected, these four DMOS high-speed analog switchs have at synchronization and only have a conducting, control logic circuit exports control signal Ctrl1, Ctrl2, Ctrl3 and Ctrl4 corresponding control four DMOS pipe Gate ends after phase inverter, these four DMOS high-speed analog switchs only have a conducting at one time, other three disconnections.
Described current-to-voltage converting circuit comprises four gear intervals, four tunnel input high speed commutation circuits connect corresponding fourth gear current-to-voltage converting circuit respectively, fourth gear current-to-voltage converting circuit output terminal is connected respectively to corresponding output high speed commutation circuit, fourth gear current-to-voltage converting circuit structure is identical, the output high speed commutation circuit structure that fourth gear current-to-voltage converting circuit is corresponding is identical, only have a wherein road to export high speed commutation circuit at synchronization and be controlled as conducting, its excess-three road high speed commutation circuit is all controlled as disconnection, when system electrification initialization, the Ctrl4 that control logic circuit exports is low level, Ctrl1, Ctrl2 and Ctrl3 is high level, the control signal Ctrl1 that control logic circuit exports, Ctrl2, Ctrl3 and Ctrl4 correspondence controls the break-make of fourth gear current-to-voltage converting circuit output terminal, realize current/voltage conversion and export the corresponding selection with input, export the voltage signal that high speed commutation circuit exports and input to anti-phase scale operation amplifying circuit, voltage signal suitably to be amplified and anti-phase, signal after anti-phase amplification is input to voltage follower, and the effect of voltage follower is to increase and exports driving force and isolate front stage circuit.
The output high speed commutation circuit structure that described fourth gear current-to-voltage converting circuit is corresponding is identical, output high speed commutation circuit corresponding to first grade of current-to-voltage converting circuit is by two DMOS speed-sensitive switch M2, M3, two resistance R6, R7, a schottky diode D1 and electric capacity C1 is formed, wherein voltage signal is from the Source end input of M3, Body termination-5V the voltage of M3, the Gate of M3 holds the Drain being connected to M2 hold and be connected in series a resistance R5, another termination+5V voltage of R5, the Gate end of M2 and Source termination-5V voltage, at Source end and the Gate terminating resistor R7 and schottky diode D1 of M2, the Ctrl1 output terminal of control logic circuit is connected to after Gate end serial connection electric capacity C1 of M2, when Ctrl1 is high level, M2 conducting, the Gate terminal voltage of M3 is that-5V, M3 end completely, and the Source terminal voltage of M3 cannot export from Drain end, when Ctrl1 is low level, M2 ends, and the Gate terminal voltage of M3 is+5V, M3 conducting, and the Source terminal voltage of M3 exports from Drain end.
Described anti-phase amplification and voltage follower comprise by high speed operation amplifier U1 and three inverting amplifier circuit that resistance R25, R26, R27 form and the voltage follower that is made up of high speed operation amplifier U2, the voltage signal exporting the output of high speed commutation circuit is input to inverting amplifier circuit, input from the end of oppisite phase of amplifier U1, signal is amplified twice, and the voltage range of output is 0 ~ 5V(or 0 ~-5V); Inverting amplifier circuit connects voltage follower, increases the driving force of output voltage.
The voltage signal that described anti-phase amplification and voltage follower export is divided into three tunnels, and a road is that analog voltage exports Vout, directly can carry out analog-to-digital conversion; An other road inputs to by high speed voltage comparator U3 and low threshold reference voltage V
rEF_Lthe low threshold discriminator circuit of composition, the low starting voltage V of Vout and setting
rEF-Lrelatively, V
rEF-Lbe set as 40mV(or-40mV), when Vout voltage is less than the threshold voltage V of setting
rEF-Ltime, then high speed voltage comparator U3 outputs signal S
lfor high level, when Vout voltage is greater than this threshold voltage, then high speed voltage comparator output signal S
lfor low level; A road is also had to input to by high speed voltage comparator U4 and high threshold reference voltage V
rEF_Hthe high threshold discriminator circuit formed, the high starting voltage V of Vout and setting
rEF-Hrelatively, V
rEF-Hbe set as 4.8V(or-4.8V), when Vout voltage is less than the threshold voltage V of setting
rEF-Htime, then high speed voltage comparator output signal S
hfor low level, when Vout voltage is greater than threshold voltage V
rEF-Htime, then high speed voltage comparator output signal S
hfor high level, these two High Speed Threshold discriminator circuit singles time of screening is less than 10nS.
Described control logic circuit adopts scale programmable logic device, and operating voltage is+3.3V, and working clock frequency is 100MHz, and the signal of input comprises low threshold mark S
l, high threshold mark S
h, the signal of output comprises gear 1 switch-over control signal Ctrl1, gear 2 switch-over control signal Ctrl2, gear 3 switch-over control signal Ctrl3 and gear 4 switch-over control signal Ctrl4.
The T-shaped resistor network that in described fourth gear current-to-voltage converting circuit, first grade of current-to-voltage converting circuit is made up of low noise high-operational amplifier A1 and three resistance R3, R4 and R5 forms, and makes current/voltage change the conversion gain of first grade into 2.3 × 10 by regulating the magnitude relationship of R3, R4 and R5
9electric current inputs from the end of oppisite phase of amplifier A1, the positive terminal ground connection of amplifier A1, input current signal be all converted on T-shaped resistor network voltage signal export, first grade of current-to-voltage converting circuit will be input as 10pA ~ 1nA(or-10pA ~-1nA) current signal be converted in real time voltage signal output; The T-shaped resistor network that second gear current-to-voltage converting circuit is made up of low noise high-operational amplifier A2 and three resistance R10, R11 and R12 forms, and makes current/voltage change the conversion gain of second gear into 2.3 × 10 by regulating the magnitude relationship of R10, R11 and R12
7, second gear current-to-voltage converting circuit will be input as 1nA ~ 100nA(-1nA ~-100nA) current signal be converted in real time voltage signal export; Third gear current-to-voltage converting circuit is made up of low noise high-operational amplifier A3 and resistance R17, makes current/voltage change the conversion gain of third gear into 2.3 × 10 by regulating R17
5, third gear current-to-voltage converting circuit will be input as 100nA ~ 10uA(-100nA ~-10uA) current signal be converted in real time voltage signal export; Fourth speed current-to-voltage converting circuit is made up of low noise high-operational amplifier A4 and resistance R22, makes current/voltage change the conversion gain of fourth speed into 2.3 × 10 by regulating R22
3, fourth speed current-to-voltage converting circuit will be input as 10uA ~ 1mA(-10uA ~-1mA) current signal be converted in real time voltage signal export; The voltage range that fourth gear current-to-voltage converting circuit converts is 0 ~ 2.5V(or 0 ~-2.5V), only have wherein one grade of current-to-voltage converting circuit in running order at synchronization, input end and the output terminal of all the other third gear current-to-voltage converting circuits all disconnect, the voltage signal that current/voltage converts is received and is exported high speed commutation circuit, four export high speed commutation circuits and four input high speed commutation circuit one_to_one corresponding.
Adopt above-mentioned technical scheme, beneficial effect of the present invention is: described self-adaptation wide-range current/voltage conversion equipment, it can process input range is in real time 10pA ~ 1mA(or-10pA ~-1mA) across 8 orders of magnitude and continually varying frequency is not more than the current signal of 1kHz, comprise four gears altogether, each gear can process the input signal of 2 orders of magnitude, and automatically can identify that input signal place gear is interval, single identification and switching time are less than 100nS.Output voltage signal scope is 0 ~ 4.8V(or 0 ~-4.8V).There is higher sensitivity and great dynamic range and good linear, thus be the small and weak current signal process of wide-range in accelerator beam diagnostics, nuclear physics, particle physics research and other association area, provide fast, simple, method and means reliably.The ability of the real-time processing signals of the system which raises, achieves input range robotization identification and handoff functionality, examines in the wide-range small and weak current signal real-time acquisition system in system and nuclear physics experiment have larger practicality and superiority at bundle.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is circuit diagram of the present invention;
Fig. 3 is sequential chart of the present invention.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figures 1 to 3, described self-adaptation wide-range current/voltage conversion equipment, is characterized in comprising the current signal I inputted with shielding respectively
inthe four tunnel input high speed commutation circuits connected, every road input high speed commutation circuit is successively with current-to-voltage converting circuit with exports high speed commutation circuit and be connected in series parallel with one another afterwards, then be connected with anti-phase amplification and voltage follower, the voltage signal that anti-phase amplification and voltage follower export is divided into three tunnels, anti-phase amplification and voltage follower one tunnel export as analog voltage exports Vout, anti-phase amplification and the other two-way of voltage follower export and connect control logic circuit respectively by high speed low threshold discriminator circuit and the high threshold discriminator circuit of high speed, described current-to-voltage converting circuit comprises four gear intervals, four tunnel input high speed commutation circuit Zhong Mei road input high speed commutation circuits are controlled by control logic circuit with the switching action of corresponding output high speed commutation circuit.
Four described tunnel input high speed commutation circuit structures are identical, and four tunnel input high speed commutation circuit Zhong Mei road input high speed commutation circuits comprise a DMOS high-speed analog switch, two resistance and a quick phase inverter, input signal I
inhold with the Source of DMOS high-speed analog switch and be connected, the Body termination-5V voltage of DMOS high-speed analog switch, input signal I
inheld by the Source of DMOS pipe and enter, input signal I
inexport from Drain end under the control of Gate end, control signal Ctrl1, by after phase inverter B1, holds with the Gate of resistance R1 and R2 acting in conjunction control DMOS high-speed analog switch, and when Ctrl1 is low level, the Source end of M1 holds conducting, I with Drain
insignal exports from the Drain end of M1, when Ctrl1 is high level, the Source end of M1 is held with Drain and is disconnected, these four DMOS high-speed analog switchs have at synchronization and only have a conducting, control logic circuit exports control signal Ctrl1, Ctrl2, Ctrl3 and Ctrl4 corresponding control four DMOS pipe Gate ends after phase inverter, these four DMOS high-speed analog switchs only have a conducting at one time, other three disconnections.
Described current-to-voltage converting circuit comprises four gear intervals, four tunnel input high speed commutation circuits connect corresponding fourth gear current-to-voltage converting circuit respectively, fourth gear current-to-voltage converting circuit output terminal is connected respectively to corresponding output high speed commutation circuit, fourth gear current-to-voltage converting circuit structure is identical, the output high speed commutation circuit structure that fourth gear current-to-voltage converting circuit is corresponding is identical, only have a wherein road to export high speed commutation circuit at synchronization and be controlled as conducting, its excess-three road high speed commutation circuit is all controlled as disconnection, when system electrification initialization, the Ctrl4 that control logic circuit exports is low level, Ctrl1, Ctrl2 and Ctrl3 is high level, the control signal Ctrl1 that control logic circuit exports, Ctrl2, Ctrl3 and Ctrl4 correspondence controls the break-make of fourth gear current-to-voltage converting circuit output terminal, realize current/voltage conversion and export the corresponding selection with input, export the voltage signal that high speed commutation circuit exports and input to anti-phase scale operation amplifying circuit, voltage signal suitably to be amplified and anti-phase, signal after anti-phase amplification is input to voltage follower, and the effect of voltage follower is to increase and exports driving force and isolate front stage circuit.
The output high speed commutation circuit structure that described fourth gear current-to-voltage converting circuit is corresponding is identical, output high speed commutation circuit corresponding to first grade of current-to-voltage converting circuit is by two DMOS speed-sensitive switch M2, M3, two resistance R6, R7, a schottky diode D1 and electric capacity C1 is formed, wherein voltage signal is from the Source end input of M3, Body termination-5V the voltage of M3, the Gate of M3 holds the Drain being connected to M2 hold and be connected in series a resistance R5, another termination+5V voltage of R5, the Gate end of M2 and Source termination-5V voltage, at Source end and the Gate terminating resistor R7 and schottky diode D1 of M2, the Ctrl1 output terminal of control logic circuit is connected to after Gate end serial connection electric capacity C1 of M2, when Ctrl1 is high level, M2 conducting, the Gate terminal voltage of M3 is that-5V, M3 end completely, and the Source terminal voltage of M3 cannot export from Drain end, when Ctrl1 is low level, M2 ends, and the Gate terminal voltage of M3 is+5V, M3 conducting, and the Source terminal voltage of M3 exports from Drain end.
Described anti-phase amplification and voltage follower comprise by high speed operation amplifier U1 and three inverting amplifier circuit that resistance R25, R26, R27 form and the voltage follower that is made up of high speed operation amplifier U2, the voltage signal exporting the output of high speed commutation circuit is input to inverting amplifier circuit, input from the end of oppisite phase of amplifier U1, signal is amplified twice, and the voltage range of output is 0 ~ 5V(or 0 ~-5V); Inverting amplifier circuit connects voltage follower, increases the driving force of output voltage.
The voltage signal that described anti-phase amplification and voltage follower export is divided into three tunnels, and a road is that analog voltage exports Vout, directly can carry out analog-to-digital conversion; An other road inputs to by high speed voltage comparator U3 and low threshold reference voltage V
rEF_Lthe low threshold discriminator circuit of composition, the low starting voltage V of Vout and setting
rEF-Lrelatively, V
rEF-Lbe set as 40mV(or-40mV), when Vout voltage is less than the threshold voltage V of setting
rEF-Ltime, then high speed voltage comparator U3 outputs signal S
lfor high level, when Vout voltage is greater than this threshold voltage, then high speed voltage comparator output signal S
lfor low level; A road is also had to input to by high speed voltage comparator U4 and high threshold reference voltage V
rEF_Hthe high threshold discriminator circuit formed, the high starting voltage V of Vout and setting
rEF-Hrelatively, V
rEF-Hbe set as 4.8V(or-4.8V), when Vout voltage is less than the threshold voltage V of setting
rEF-Htime, then high speed voltage comparator output signal S
hfor low level, when Vout voltage is greater than threshold voltage V
rEF-Htime, then high speed voltage comparator output signal S
hfor high level, these two High Speed Threshold discriminator circuit singles time of screening is less than 10nS.
Described control logic circuit adopts scale programmable logic device, and operating voltage is+3.3V, and working clock frequency is 100MHz, and the signal of input comprises low threshold mark S
l, high threshold mark S
h, the signal of output comprises gear 1 switch-over control signal Ctrl1, gear 2 switch-over control signal Ctrl2, gear 3 switch-over control signal Ctrl3 and gear 4 switch-over control signal Ctrl4.
The T-shaped resistor network that in described fourth gear current-to-voltage converting circuit, first grade of current-to-voltage converting circuit is made up of low noise high-operational amplifier A1 and three resistance R3, R4 and R5 forms, and makes current/voltage change the conversion gain of first grade into 2.3 × 10 by regulating the magnitude relationship of R3, R4 and R5
9electric current inputs from the end of oppisite phase of amplifier A1, the positive terminal ground connection of amplifier A1, input current signal be all converted on T-shaped resistor network voltage signal export, first grade of current-to-voltage converting circuit will be input as 10pA ~ 1nA(or-10pA ~-1nA) current signal be converted in real time voltage signal output; The T-shaped resistor network that second gear current-to-voltage converting circuit is made up of low noise high-operational amplifier A2 and three resistance R10, R11 and R12 forms, and makes current/voltage change the conversion gain of second gear into 2.3 × 10 by regulating the magnitude relationship of R10, R11 and R12
7, second gear current-to-voltage converting circuit will be input as 1nA ~ 100nA(-1nA ~-100nA) current signal be converted in real time voltage signal export; Third gear current-to-voltage converting circuit is made up of low noise high-operational amplifier A3 and resistance R17, makes current/voltage change the conversion gain of third gear into 2.3 × 10 by regulating R17
5, third gear current-to-voltage converting circuit will be input as 100nA ~ 10uA(-100nA ~-10uA) current signal be converted in real time voltage signal export; Fourth speed current-to-voltage converting circuit is made up of low noise high-operational amplifier A4 and resistance R22, makes current/voltage change the conversion gain of 3 grades into 2.3 × 10 by regulating R22
3, fourth speed current-to-voltage converting circuit will be input as 10uA ~ 1mA(-10uA ~-1mA) current signal be converted in real time voltage signal export; The voltage range that fourth gear current-to-voltage converting circuit converts is 0 ~ 2.5V(or 0 ~-2.5V), only have wherein one grade of current-to-voltage converting circuit in running order at synchronization, input end and the output terminal of all the other third gear current-to-voltage converting circuits all disconnect, the voltage signal that current/voltage converts is received and is exported high speed commutation circuit, four export high speed commutation circuits and four input high speed commutation circuit one_to_one corresponding.
Described self-adaptation wide-range current/voltage conversion equipment, can process that continually varying frequency is not more than 1kHz, input range is 10pA ~ 1mA(or-10pA ~-1mA in real time) across the current signal of 8 orders of magnitude; Comprise four gears altogether, each gear can process the input signal of 2 orders of magnitude, and automatically can identify that input signal place gear is interval, and single identification and switching time are less than 100nS; Output voltage signal scope is 0 ~ 4.8V(or 0 ~-4.8V); Circuit is arranged in airtight shielding box, tests its integral non-linear error and is less than 0.9%; Circuit working is stablized, and conversion accuracy is high, and antijamming capability is strong.Achieve the conversion of self-adaptation wide-range current/voltage, fast self application identification and high gear to switch, there is higher sensitivity, great dynamic range and good linear, frequency can be not more than 1kHz and continually varying current signal converts the voltage signal that can directly gather in real time in 8 number order magnitude range, the ability of the real-time processing signals of the system that improves, examines for bundle and provides a kind of simple and effective new method with the reading of the wide-range current-output type detector signal in nuclear physics experiment system.
The course of work of a kind of self-adaptation wide-range current-to-voltage converting circuit of the present invention: during circuit electrification reset, Ctrl4 is set to low level, Ctrl1, Ctrl2 and Ctrl3 are high level, in order to reduce error, the low level time of Ctrl4 must be greater than 60nS, therefore be set as 100nS in this circuit, control logic circuit (Ctrl4 is also in low level state) when waiting for 90nS reads S
land S
hthe state of signal.If S
lfor high level, S
hfor low level, then the Ctrl3 that control logic circuit exports is low level, and Ctrl1, Ctrl2 and Ctrl4 are high level; If S
lfor low level, S
hfor high level, or S
lfor low level, S
hfor low level, then control logic circuit exports Ctrl1, Ctrl2, Ctrl3 and Ctrl4 continue to maintain the original state.After Ctrl3 is low level, same its high level time of setting is 100nS, and control logic circuit reads S after waiting for 90nS
land S
hthe state of signal.If S
lfor high level, S
hfor low level, then the Ctrl2 that control logic circuit exports is low level, and Ctrl1, Ctrl3 and Ctrl4 are high level; If S
lfor low level, S
hfor high level, then the Ctrl4 that control logic circuit exports is low level, and Ctrl1, Ctrl2 and Ctrl3 are high level; If S
lfor low level, S
halso be low level, then control logic circuit exports Ctrl1, Ctrl2, Ctrl3 and Ctrl4 continue to maintain the original state.After Ctrl2 is low level, same its high level time of setting is 100nS, and control logic circuit reads S after waiting for 90nS
land S
hthe state of signal.If S
lfor high level, S
hfor low level, then the Ctrl1 that control logic circuit exports is low level, and Ctrl2, Ctrl3 and Ctrl4 are high level; If S
lfor low level, S
hfor high level, then the Ctrl3 that control logic circuit exports is low level, and Ctrl1, Ctrl2 and Ctrl4 are high level; If S
lfor low level, S
hfor low level, then control logic circuit exports Ctrl1, Ctrl2, Ctrl3 and Ctrl4 continue to maintain the original state.After Ctrl1 is high level, same its high level time of setting is 100nS, and control logic circuit reads S after waiting for 90nS
land S
hthe state of signal.If S
lfor high level, S
hfor low level, or S
lfor low level, S
halso be low level, then control logic circuit exports Ctrl1, Ctrl2, Ctrl3 and Ctrl4 continue to maintain the original state; If S
lfor low level, S
hfor high level, then the Ctrl2 that control logic circuit exports is low level, and Ctrl1, Ctrl3 and Ctrl4 are high level.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a self-adaptation wide-range current/voltage conversion equipment, is characterized in that comprising the current signal inputted with shielding respectively
i in the four tunnel input high speed commutation circuits connected, every road input high speed commutation circuit is successively with current-to-voltage converting circuit with exports high speed commutation circuit and be connected in series parallel with one another afterwards, then be connected with anti-phase amplification and voltage follower, the voltage signal that anti-phase amplification and voltage follower export is divided into three tunnels, one tunnel is that analog voltage exports Vout, two-way connects control logic circuit respectively by high speed low threshold discriminator circuit and the high threshold discriminator circuit of high speed in addition, described current-to-voltage converting circuit comprises four gear intervals, four gear Zhong Mei road input high speed commutation circuits are controlled by control logic circuit with the switching action of corresponding output high speed commutation circuit, four described tunnel input high speed commutation circuit structures are identical, and four tunnel input high speed commutation circuit Zhong Mei road input high speed commutation circuits comprise a DMOS high-speed analog switch, two resistance and a phase inverter, input signal
i in hold with the Source of DMOS high-speed analog switch and be connected, the Body termination-5V voltage of DMOS high-speed analog switch, input signal
i in held by the Source of DMOS pipe and enter, input signal
i in export from Drain end under the control of Gate end, control signal Ctrl1, by after phase inverter B1, holds with the Gate of resistance R1 and R2 acting in conjunction control DMOS high-speed analog switch, and when Ctrl1 is low level, the Source end of M1 holds conducting with Drain,
i in signal exports from the Drain end of M1, when Ctrl1 is high level, the Source end of M1 is held with Drain and is disconnected, control logic circuit exports control signal Ctrl1, Ctrl2, Ctrl3 and Ctrl4 corresponding Gate end controlling four DMOS pipe after phase inverter, these four DMOS high-speed analog switchs only have a conducting at one time, other three disconnections, four described tunnel input high speed commutation circuits connect corresponding fourth gear current-to-voltage converting circuit respectively, fourth gear current-to-voltage converting circuit output terminal is connected respectively to corresponding output high speed commutation circuit, fourth gear current-to-voltage converting circuit structure is identical, the output high speed commutation circuit structure that fourth gear current-to-voltage converting circuit is corresponding is identical, only have a wherein road to export high speed commutation circuit at synchronization and be controlled as conducting, its excess-three road high speed commutation circuit is all controlled as disconnection, when system electrification initialization, the Ctrl4 that control logic circuit exports is low level, Ctrl1, Ctrl2 and Ctrl3 is high level, the control signal Ctrl1 that control logic circuit exports, Ctrl2, Ctrl3 and Ctrl4 correspondence controls the break-make of fourth gear current-to-voltage converting circuit output terminal, realize current/voltage conversion and export the corresponding selection with input, export the voltage signal that high speed commutation circuit exports and input to anti-phase scale operation amplifying circuit, voltage signal suitably to be amplified and anti-phase, signal after anti-phase amplification is input to voltage follower, and the effect of voltage follower is to increase and exports driving force and isolate front stage circuit.
2. self-adaptation wide-range current/voltage conversion equipment as claimed in claim 1, it is characterized in that: output high speed commutation circuit corresponding to first grade of current-to-voltage converting circuit of described fourth gear current-to-voltage converting circuit is by two DMOS speed-sensitive switch M2, M3, two resistance R6, R7, a schottky diode D1 and electric capacity C1 is formed, wherein voltage signal is from the Source end input of M3, Body termination-5V the voltage of M3, the Gate of M3 holds the Drain being connected to M2 hold and be connected in series a resistance R6, another termination+5V voltage of R6, the Gate end of M2 and Source termination-5V voltage, at Source end and the Gate terminating resistor R7 and schottky diode D1 of M2, the Ctrl1 output terminal of control logic circuit is connected to after Gate end serial connection electric capacity C1 of M2, when Ctrl1 is high level, M2 conducting, the Gate terminal voltage of M3 is that-5V, M3 end completely, and the Source terminal voltage of M3 cannot export from Drain end, when Ctrl1 is low level, M2 ends, and the Gate terminal voltage of M3 is+5V, M3 conducting, and the Source terminal voltage of M3 exports from Drain end.
3. self-adaptation wide-range current/voltage conversion equipment as claimed in claim 1, it is characterized in that: described anti-phase amplification and voltage follower comprise by high speed operation amplifier U1 and three inverting amplifier circuit that resistance R25, R26, R27 form and the voltage follower that is made up of high speed operation amplifier U2, the voltage signal exporting the output of high speed commutation circuit is input to inverting amplifier circuit, input from the end of oppisite phase of amplifier U1, signal is amplified twice, and the voltage range of output is 0 ~ 5V or 0 ~-5V; Inverting amplifier circuit connects voltage follower, increases the driving force of output voltage.
4. self-adaptation wide-range current/voltage conversion equipment as claimed in claim 1, is characterized in that: the voltage signal that described anti-phase amplification and voltage follower export is divided into three tunnels, and a road is that analog voltage exports Vout, directly can carry out analog-to-digital conversion; An other road inputs to by high speed voltage comparator U3 and low threshold reference voltage V
rEF-Lthe low threshold discriminator circuit of composition, the low threshold reference voltage V of Vout and setting
rEF-Lrelatively, V
rEF-Lbe set as 40mV or-40mV, when Vout voltage is less than the low threshold reference voltage V of setting
rEF-Ltime, then high speed voltage comparator U3 outputs signal S
lfor high level, when Vout voltage is greater than this low threshold reference voltage V
rEF-Ltime, then high speed voltage comparator output signal S
lfor low level; A road is also had to input to by high speed voltage comparator U4 and high threshold reference voltage V
rEF-Hthe high threshold discriminator circuit formed, the high threshold reference voltage V of Vout and setting
rEF-Hrelatively, V
rEF-Hbe set as 4.8V or-4.8V, when Vout voltage is less than the high threshold reference voltage V of setting
rEF-Htime, then high speed voltage comparator output signal S
hfor low level, when Vout voltage is greater than high threshold reference voltage V
rEF-Htime, then high speed voltage comparator output signal S
hfor high level, these two High Speed Threshold discriminator circuit singles time of screening is less than 10nS.
5. self-adaptation wide-range current/voltage conversion equipment as claimed in claim 1, it is characterized in that: described control logic circuit adopts scale programmable logic device, operating voltage is+3.3V, and working clock frequency is 100MHz, and the signal of input comprises low threshold mark S
l, high threshold mark S
h, the signal of output comprises gear 1 switch-over control signal Ctrl1, gear 2 switch-over control signal Ctrl2, gear 3 switch-over control signal Ctrl3 and gear 4 switch-over control signal Ctrl4.
6. self-adaptation wide-range current/voltage conversion equipment as claimed in claim 1 or 2, it is characterized in that: the T-shaped resistor network that in described fourth gear current-to-voltage converting circuit, first grade of current-to-voltage converting circuit is made up of low noise high-operational amplifier A1 and three resistance R3, R4 and R5 forms, making current/voltage change the conversion gain of first grade into 2.3 × 10 by regulating the magnitude relationship of R3, R4 and R5
9electric current inputs from the end of oppisite phase of amplifier A1, the positive terminal ground connection of amplifier A1, the current signal of input is all converted to voltage signal and exports on T-shaped resistor network, and the current signal being input as 10pA ~ 1nA or-10pA ~-1nA is converted to voltage signal and exports by first grade of current-to-voltage converting circuit in real time; The T-shaped resistor network that second gear current-to-voltage converting circuit is made up of low noise high-operational amplifier A2 and three resistance R10, R11 and R12 forms, and makes current/voltage change the conversion gain of second gear into 2.3 × 10 by regulating the magnitude relationship of R10, R11 and R12
7, the current signal being input as 1nA ~ 100nA or-1nA ~-100nA is converted to voltage signal and exports by second gear current-to-voltage converting circuit in real time; Third gear current-to-voltage converting circuit is made up of low noise high-operational amplifier A3 and resistance R17, makes current/voltage change the conversion gain of third gear into 2.3 × 10 by regulating R17
5, the current signal being input as 100nA ~ 10uA or-100nA ~-10uA is converted to voltage signal and exports by third gear current-to-voltage converting circuit in real time; Fourth speed current-to-voltage converting circuit is made up of low noise high-operational amplifier A4 and resistance R22, makes current/voltage change the conversion gain of fourth speed into 2.3 × 10 by regulating R22
3, the current signal being input as 10uA ~ 1mA or-10uA ~-1mA is converted to voltage signal and exports by fourth speed current-to-voltage converting circuit in real time; The voltage range that fourth gear current-to-voltage converting circuit converts is 0 ~ 2.5V or 0 ~-2.5V, only have wherein one grade of current-to-voltage converting circuit in running order at synchronization, input end and the output terminal of all the other third gear current-to-voltage converting circuits all disconnect, the voltage signal that current/voltage converts is received and is exported high speed commutation circuit, four export high speed commutation circuits and four input high speed commutation circuit one_to_one corresponding.
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| CN108365759B (en) * | 2018-03-30 | 2024-05-03 | 佛山科学技术学院 | Current/voltage conversion circuit |
| CN110568252A (en) * | 2019-08-29 | 2019-12-13 | 桂林电子科技大学 | four-channel double-gear interface control circuit current detection system |
| CN111562521A (en) * | 2020-05-27 | 2020-08-21 | 南京信息工程大学 | Signal acquisition method of range adaptive power system |
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