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Analog Front End Circuit

A technology that simulates front-end circuits and output voltages, and is used in electrical components, analog-to-digital conversion, and measurement of electrical variables to achieve the effect of eliminating offset components

Active Publication Date: 2022-07-15
NEW JAPAN RADIO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the chopping signal CHOP is "1", the output voltage VOUTP becomes negative, which causes the same image 3 The analog front-end circuit 20A shown in the same problem

Method used

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  • Analog Front End Circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] figure 1 An analog front-end circuit 10A according to the first embodiment is shown. The analog front-end circuit 10A is equipped with: a non-inverting instrumentation preamplifier 11A that amplifies the difference between the input voltages VINP and VINN input from the sensor 1 and outputs the output voltages VOUTP and VOUTN; switches SW4 and SW5 (switch units) in which each of which switches between the output voltages VOUTP and VOUTN; an AD converter 22 (AD converter) for converting the difference between the output voltages VOUTP and VOUTN output from the switches SW4 and SW5 into a digital signal; a switching circuit 13 which passes the output data of the AD converter 12 as it is or after inverting its polarity; and a data calculator 14 (data calculator) for continuously calculating the difference between the two data output from the switching circuit 13 average data.

[0107] Non-inverting instrumentation preamplifier 11A consists of switches SW1 and SW2, each ...

Embodiment 2

[0133] figure 2 An analog front-end circuit 10B according to the second embodiment is shown. The analog front-end circuit 10B and figure 1 The analog front end circuit 10A shown in differs in the non-inverting instrumentation preamplifier 11B. Non-inverting instrumentation preamplifier 11B with figure 1 The non-inverting instrumentation preamplifier 11A shown in is different in that an operational amplifier OP2, switches SW7 and SW8, and a switch circuit 11b having an inverting circuit 11b1 and a switch SW9 are added as a voltage follower circuit And the output voltage of the operational amplifier OP2 is passed as it is or after inverting its polarity.

[0134] Each of the switches SW1 and SW2 switches between the input voltages of the operational amplifier OP1, and each of the switches SW7 and SW8 switches between the input voltages of the operational amplifier OP2.

[0135] Each of the switches SW1-SW6 selects the input terminals "0" and "1" when the chopper signal CH...

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PUM

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Abstract

One embodiment provides an analog front end circuit. When the chopped signal has the first logic value, the non-inverting instrumentation preamplifier subtracts the second input voltage from the first input voltage and outputs the second input voltage as the second output voltage by amplifying the subtracted voltage to A first output voltage is generated. When the chopped signal has the second logic value, the non-inverting instrumentation preamplifier subtracts the first input voltage from the second input voltage, and while outputting the second input voltage as the second output voltage by amplifying and then inverting The polarities of the voltages are subtracted to generate the first output voltage.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority from Japanese Patent Application No. 2016-085016 filed on April 21, 2016, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to an analog front end circuit including an instrumentation preamplifier and an AD converter, and more particularly, to a technique for reducing offset components, temperature drift, low frequency noise, and the like. Background technique [0004] In an analog front-end circuit, a very small analog signal obtained by detecting temperature is amplified and AD-converted into data, for example. In this operation, offset components, temperature drift, low-frequency noise, etc. (hereinafter referred to as "offset components, etc.") occurring in instrumentation preamplifiers and AD converters having high amplification factors have a great effect on the performance of the entire circuit big impact. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F1/30H03M1/06H03M1/08H03M1/12
CPCH03F1/26H03F1/30H03M1/0607H03M1/08H03M1/1245H03F3/45475H03F3/45968G01R1/30G01R1/44G01R35/00H03F3/387H03F2200/261H03F2200/375
Inventor 示野洋一
Owner NEW JAPAN RADIO CORP