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:
Aug. 08, 2000
Filed:
Jan. 08, 1999
Ian Juso Dedic, Northolt, GB;
Fujitsu Microelectronics Europe GmbH, Dreieich-Buchschlag, DE;
Abstract
Differential switching circuitry, for use for example in a digital-to-analog converter, includes: a first switch element (S1) connected between a common node (CN) and a first output node (OUT1), and a second switch element (S2) connected between the common node (N) and a second output node (OUT2). First and second driver circuits (12, 14) correspond respectively to the first and second switch elements, each driver circuit switching its corresponding element ON and OFF in dependence upon an applied input signal (IN1, IN2). The driver circuits co-operate such that one switch element is ON when the other is OFF. Each switch element (S1, S2) is paired with a matching element (46, 44) in the other switch element's driver circuit. That matching element (e.g. 44) is coupled operatively to its paired switch element's driver circuit (14) and is matched, e.g. in gate-source potential, with its paired switch element (S2) such that switching of the matching element from OFF to ON is matched with switching of its paired switch element (S2) from OFF to ON, that switching of the matching element serving to bring about switching of said other switch element (S1) from ON to OFF. In such differential switching circuitry, symmetrical switching of the switch elements is ensured even if the input signals do not undergo symmetrical changes.