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Signal conditioning circuit for high precision measuring uV level voltage

A high-precision, voltage technology, applied in the field of measurement, can solve the problem of low precision of signal conditioning circuits, and achieve the effect of improving the performance of conditioning circuits, measurement accuracy, stability and reliability

Inactive Publication Date: 2009-04-22
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a signal conditioning circuit for high-precision measurement of uV level voltage in view of the defect that the existing signal conditioning circuit has low precision when measuring weak signals

Method used

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  • Signal conditioning circuit for high precision measuring uV level voltage
  • Signal conditioning circuit for high precision measuring uV level voltage
  • Signal conditioning circuit for high precision measuring uV level voltage

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Embodiment Construction

[0014] Such as figure 1 As shown, the process calibrator includes microprocessor, LCD display, memory, communication interface, keyboard, signal conditioning module, output channel DAC module, voltage reference module, constant current source module, input channel ADC module, analog switch module, micro The processor is connected to the LCD display, memory, communication interface, keyboard, input channel ADC module, and signal conditioning module, the output channel DAC module is connected to the analog switch module and the constant current source module, and the input channel ADC module is respectively connected to the analog switch Module, voltage reference module and constant current source module are connected.

[0015] Such as figure 2 As shown, the signal conditioning circuit for high-precision measurement of uV level voltage is characterized in that: pin 1 and pin 9 of the analog switch LTC201 are respectively connected to pin 4 and pin 5 of the inverter 74HC04, and...

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Abstract

The invention discloses a signal conditioning circuit for high-precision measurement of mu V-level voltage. The conditioning circuit comprises three parts of a two-phase square-wave generator, a signal amplification circuit which is based on the principles of chopper modulation and demodulation and a closed-loop feedback compensation circuit. The square-wave generator is composed of three inverters and a peripheral resistance capacitance element, the signal amplification circuit is composed of two general-purpose operational amplifiers, four analog switches and the peripheral resistance capacitance element, each two analog switches constitute one group and are used as input and output analog switches to be respectively controlled by two output signals of the square-wave generator; the chopper modulation by the input analog switches, the amplification by the first operational amplifier, the synchronous demodulation by the output analog switches and the second amplification treatment by the second operational amplifier are carried out on a signal to be measured; a conditioning signal which is output by the second operational amplifier is fed back to a signal input end after the voltage division by the resistance, thereby constituting the closed-loop feedback compensation circuit. The technical specifications of the signal conditioning circuit are as follows by the test: noise is less than 40nV at 0.1-10Hz, offset voltage is less than 1uV, and offset drift is less than 0,01uV per DEG C, thereby fully meeting the requirements on the high-precision measurement.

Description

technical field [0001] The invention relates to the design of a signal conditioning circuit in the measurement field, in particular to a signal conditioning circuit for measuring uV level voltage with high precision. Background technique [0002] The safe, reliable, economical and efficient operation of process technology production equipment depends on digital measurement and control instruments installed on the process pipeline of the production equipment, such as: sensors, transmitters, regulators and actuators to monitor and adjust process parameters. The process calibrator is a special instrument for the verification and maintenance of digital measurement and control instruments. Its basic function is to measure (input) and output thermoelectric signals such as voltage, current, frequency, and temperature. The measurement accuracy is 0.01% to 0.015%. Since the minimum analog signal at the measurement end of the process calibrator can reach uV level, the structural desig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00H03F1/30
Inventor 邵旭敏杨江吴明光丁程周平
Owner ZHEJIANG UNIV
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