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:
Jan. 10, 1995
Filed:
Jul. 12, 1993
Michael Mueck, Bradford, MA (US);
Paul F Ferguson, Jr, Dracut, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A system includes a digital-to-analog converter circuit and a calibration circuit. The digital-to-analog converter circuit includes a gain control circuit providing volume adjustment. The system includes a calibration mode and a normal mode of operation. During calibration, a correction value associated with the gain control circuit is measured by the calibration circuit and stored. During normal operation, the stored correction value is combined with the input before provision of the same to the DAC circuit such that, for a predetermined input of midscale code, the desired system output remains constant despite any change in the volume setting of the gain control circuit.