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. 12, 1995
Filed:
Aug. 12, 1993
Douglas A Mercer, Bradford, MA (US);
Analog Devices, Incorporated, Norwood, MA (US);
Abstract
A digital-to-analog converter including a plurality of binarily-weighted stages each incorporating a differential switch-pair circuit which includes two matched bipolar switch transistors the bases of which are driven by a corresponding pair of complementary signal sources. Two additional switches are included in this circuit, with each such switch being connected between a respective signal source and its corresponding transistor control electrode. These two switches are both opened before the clock-controlled activation of the complementary signal sources. A short time after such activation, sufficient to assure that the complementary signal voltages have stabilized at their new values, the two additional switches are reclosed simultaneously by a single control signal so as to effect synchronized switchover of the two switch transistors at that instant. Capacitors are included to maintain effectively constant the base voltages of the two switch transistors during the time that the two additional switches are open.