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Lost point compensation circuit of chopping type digital integral circuit

A digital integration and compensation circuit technology, applied in the field of digital integrator, to achieve the effect of accurate integration measurement and compensation for loss of sampling data

Active Publication Date: 2020-04-21
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the chopper switches, it will discard part of the sampled data due to the open-loop input of the op amp, and it is necessary to use a suitable circuit to compensate this part of the data.

Method used

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  • Lost point compensation circuit of chopping type digital integral circuit
  • Lost point compensation circuit of chopping type digital integral circuit

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] see figure 1 , a lost-point compensation circuit of a chopper-type digital integration circuit, including a signal source V in , low-pass filter circuits R1, C1, R2, analog switches S1, S2 and operational amplifiers OP1, OP2, the signal source V in Both ends of the low-pass filter capacitor C1 (assumed to be V+ and V-) are connected to low-pass filter circuits R1 and R2, and then output at both ends of the low-pass filter capacitor C1 (assu...

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Abstract

The invention discloses a point loss compensation circuit of a chopping type digital integral circuit. The point loss compensation circuit comprises a signal source Vin, low-pass filter circuits R1, C1 and R2, analog switches S1 and S2 and operational amplifiers OP1 and OP2. Two input ends of a signal source Vin are respectively connected to the low-pass filter circuit resistor R1 and the low-passfilter circuit resistor R2, then are output from the low-pass filter capacitor C1, are respectively connected to two analog switches S1 and S2, respectively enter he operational amplifier OP1 and theoperational amplifier OP2, and then enter an AD sampling element. The switching frequencies of the S1 and the S2 are the same, and the phase of the S2 lags behind the S1 for a certain time. The operational amplifier input open-circuit sampling data loss caused by the action of the analog switch can be compensated, so that the input data of the chopper type digital integrator is more perfect, andthe method is simple.

Description

technical field [0001] The invention relates to the field of digital integrators, in particular to a lost-point compensation circuit of a chopper-type digital integration circuit. Background technique [0002] Integrators are mainly used in electromagnetic measurements of some devices. For example, in the process of tokamak discharge experiments, the output of many electromagnetic measurement diagnostic signals is the differential component of the signal. To restore the signal, an integrator is needed. At the same time, in order to eliminate the error accumulation caused by the zero drift of the integrator during long-term operation, a chopper is used at the input end of the commonly used digital integrator to eliminate the zero drift. However, when the chopper switches, it will discard part of the sampling data due to the open-loop input of the op amp, and it is necessary to use a suitable circuit to compensate this part of the data. Contents of the invention [0003] In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/12
CPCH03H7/12
Inventor 季振山贺渊明
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI