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Analog front-end circuit

A technology that simulates front-end circuits and input terminals, 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: 2017-10-31
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 input voltages VINP and VINN input from the sensor 1 and outputs output voltages VOUTP and VOUTN; switches SW4 and SW5 (switching units), in which Each switches between output voltages VOUTP and VOUTN; AD converter 22 (AD converter) for converting the difference between output voltages VOUTP and VOUTN output from switches SW4 and SW5 into a digital signal; switch circuit 13, which passes the output data of the AD converter 12 as it is or after inverting its polarity; Average data.

[0107] Non-inverting instrumentation preamplifier 11A consists of: switches SW1 and SW2, each of which switches between input voltages VINP and VINN; operational amplifier OP1, which is used to amplify the input voltage VINP through switches SW1 and SW2 and VINN; gain ...

Embodiment 2

[0133] figure 2 An analog front-end circuit 10B according to the second embodiment is shown. Analog front-end circuit 10B with figure 1 The analog front-end circuit 10A shown in is different from 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 pass the output voltage of the operational amplifier OP2 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 input terminals "0" and "1" when the chopping signal CHOP i...

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PUM

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Abstract

One embodiment provides an analog front-end circuit. When a chopping signal has a first logical value, a non-inverting instrumentation preamplifier subtracts a second input voltage from a first input voltage and generates a first output voltage by amplifying a subtraction voltage while outputting the second input voltage as a second output voltage. When the chopping signal has a second logical value, the non-inverting instrumentation preamplifier subtracts the first input voltage from the second input voltage and generates the first output voltage by amplifying and then inverting the polarity of a subtraction voltage while outputting the second input voltage as the second output voltage.

Description

[0001] Cross References 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 preamplifer and an AD converter, and more particularly, relates to a technique for reducing offset components, temperature drift, low-frequency noise, and the like. Background technique [0004] In the analog front-end circuit, a very small analog signal obtained by detecting temperature, for example, is amplified and AD-converted into data. In this operation, offset components, temperature drift, low-frequency noise, etc. (hereinafter referred to as "offset components, etc.") that occur in the instrumentation preamplifier with a high amplification factor and the AD converter have a great influence on the performance of the entire circ...

Claims

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Application Information

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Patent Type & Authority Applications(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