The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2002
Filed:
Feb. 25, 1999
Seiko Epson Corporation, Tokyo, JP;
Abstract
An image signal processing circuit ( ) includes a phase-expansion circuit ( ), a digital polarity-inversion circuit ( ), first to sixth D/A converters ( to ), and first to sixth operational amplifiers ( to ). The resistance value of the first to sixth amplitude adjusting resistors ( to ) which cause the output amplitude of an analog signal output from the first to sixth D/A converters ( to ) to be fixed is adjusted by laser trimming. First to sixth gain setting resistors ( to ) are connected to the first to sixth operational amplifiers ( to ). The first gain setting resistor ( ) includes a first resistor ( ) and a second resistor ( ), and the gain of the operational amplifier ( ) is set by the resistance ratio (R R ) thereof. In order that this resistance ratio (R R ) is fixed for each set, the first resistor ( ) and the second resistor ( ) are formed on the same substrate by undergoing the same manufacturing process. As a result, there is no need to use the first and second resistors ( ) for variable resistors.
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