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:
Jun. 04, 1996
Filed:
Feb. 27, 1995
Fujitsu Limited, Kawasaki, JP;
Abstract
A digitally controlled variable gain circuit which receives an analog input voltage and produces an analog output voltage. The digitally controlled variable gain circuit includes a first resistor string having first and second ends and a plurality of resistors connected in series between the first and second ends, the second end of the first resistor string being grounded and the analog input voltage being applied across the first and second ends of the first resistor string. A first selection mechanism, coupled to the first resistor string and responsive to a first digital control signal, provides a selectively determinable voltage divided output from the first resistor string. A second resistor string has first and second ends and a plurality of resistors connected in series between the first and second ends, the second end of the second resistor string being grounded and the voltage divided output provided by the first selection mechanism being applied across the first and second ends of the second resistor string. A second selection mechanism, coupled to the second resistor string and responsive to a second digital control signal, provides a selectively determinable voltage divided output from the second resistor string as the analog output voltage.