ELECTRONIC VOLUME CIRCUIT

PROBLEM TO BE SOLVED: To provide an electronic volume circuit which reduces an error associated to a gain and reduces noise. SOLUTION: The electronic volume circuit includes: an operational amplifier OP1; a variable input resistors RI, RJ provided between an input terminal Vin and an input terminal...

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Bibliographic Details
Main Authors SHIURA HIROSHI, EJIRI KEITA
Format Patent
LanguageEnglish
Published 05.08.2010
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRICITY
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Summary:PROBLEM TO BE SOLVED: To provide an electronic volume circuit which reduces an error associated to a gain and reduces noise. SOLUTION: The electronic volume circuit includes: an operational amplifier OP1; a variable input resistors RI, RJ provided between an input terminal Vin and an input terminal (-) of the operational amplifier; a variable feedback resistors RK, RL provided between an output terminal Vout of the operational amplifier and the input terminal Vin; and a selection control unit 10 for variably setting a gain by selecting combinations of the resistors RI, RJ constituting the variable input resistor and the resistors RK, RL constituting the variable feedback resistor. The selection control unit 10 selects combinations of the variable input resistors RI, RJ and the variable feedback resistors RK, RL in accordance with the gain set to the electronic volume circuit, thereby suppressing an error of the gain and noise. COPYRIGHT: (C)2010,JPO&INPIT
Bibliography:Application Number: JP20090014499