JPS5494862A - Analog digital converter of gain automatic selection system - Google Patents

Analog digital converter of gain automatic selection system

Info

Publication number
JPS5494862A
JPS5494862A JP112378A JP112378A JPS5494862A JP S5494862 A JPS5494862 A JP S5494862A JP 112378 A JP112378 A JP 112378A JP 112378 A JP112378 A JP 112378A JP S5494862 A JPS5494862 A JP S5494862A
Authority
JP
Japan
Prior art keywords
gain
amplifier
signal
multiplexer
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP112378A
Other languages
Japanese (ja)
Inventor
Shuichi Senda
Norio Murayama
Yoshiyuki Futahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP112378A priority Critical patent/JPS5494862A/en
Publication of JPS5494862A publication Critical patent/JPS5494862A/en
Pending legal-status Critical Current

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  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE: To automatically select the gain level, by sequentially comparing the signal source voltage fetched with the input multiplexer with a plurality of reference voltages corresponding to the gain level of the operational amplifier, and by selecting the level predetermined with the siganl source voltage.
CONSTITUTION: A plurality of signal source voltages 1,2...n are sequentially fetched with the input multiplexer 1, and the operational amplifier amplifying the signal voltage from the multiplexer 1 to a given voltage level predetermined, is provided, and the output of the amplifier 2 is fed to the data processing unit 14 via the A/D converter 6. Between the multiplexer 1 and the amplifier 2, the electronic switch 8, reference generator 9 having the voltages according to the gain levels G1 to G8 of the amplifier 2, and comparator 10 are provided. Further, the decoder 12 decoding the output of the counter 11 and inputting it to the gain selection circuit 7, and detector 13 controlling the operation of the counter 11 with the signal from the comparator 10, are provided, and the level predetermined according to the signal voltage can automatically selected.
COPYRIGHT: (C)1979,JPO&Japio
JP112378A 1978-01-11 1978-01-11 Analog digital converter of gain automatic selection system Pending JPS5494862A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP112378A JPS5494862A (en) 1978-01-11 1978-01-11 Analog digital converter of gain automatic selection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP112378A JPS5494862A (en) 1978-01-11 1978-01-11 Analog digital converter of gain automatic selection system

Publications (1)

Publication Number Publication Date
JPS5494862A true JPS5494862A (en) 1979-07-26

Family

ID=11492668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP112378A Pending JPS5494862A (en) 1978-01-11 1978-01-11 Analog digital converter of gain automatic selection system

Country Status (1)

Country Link
JP (1) JPS5494862A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63198417A (en) * 1985-12-19 1988-08-17 アンステイテイ　フランセ−ズ　ド　ペトロ−ル Apparatus for amplifying and sampling high dynamic signals
JPS63290411A (en) * 1987-05-22 1988-11-28 Yokogawa Medical Syst Ltd Measuring instrument for multi-point input signal
JPH01243723A (en) * 1988-03-25 1989-09-28 Mitsubishi Electric Corp Multipoint analog input circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63198417A (en) * 1985-12-19 1988-08-17 アンステイテイ　フランセ−ズ　ド　ペトロ−ル Apparatus for amplifying and sampling high dynamic signals
JPS63290411A (en) * 1987-05-22 1988-11-28 Yokogawa Medical Syst Ltd Measuring instrument for multi-point input signal
JPH01243723A (en) * 1988-03-25 1989-09-28 Mitsubishi Electric Corp Multipoint analog input circuit

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