MASS SPECTROMETER

PROBLEM TO BE SOLVED: To simplify construction of current-to-voltage converter switching in characteristics according to scan speed, and to improve stability of a circuit at the time of the switching. SOLUTION: A current-to-voltage converter 11 is arranged to insert a circuit formed by series-connec...

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Bibliographic Details
Main Authors KATO DAIJIRO, MIZUTANI SHIRO, TOMITA SO, TANAKA YASUFUMI
Format Patent
LanguageEnglish
Published 08.10.2009
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:PROBLEM TO BE SOLVED: To simplify construction of current-to-voltage converter switching in characteristics according to scan speed, and to improve stability of a circuit at the time of the switching. SOLUTION: A current-to-voltage converter 11 is arranged to insert a circuit formed by series-connecting a first resistor R1 with a parallel circuit of a second resistor R2 and a switch SW1, between a non-inverting input terminal and an output terminal of an operational amplifier A1. A control section 10 controls the switch SW1 to be closed when scan speed is high to reduce a feedback resistance and reduce a gain but to widen a frequency band. Only one switch for the current-to-voltage converter 11 is required, so that cost reduction is achieved; and a feedback loop is not opened at the switching time, so that operation of the current-to-voltage converter 11 becomes stable. COPYRIGHT: (C)2010,JPO&INPIT
Bibliography:Application Number: JP20080074841