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:
Feb. 09, 1993
Filed:
Aug. 14, 1991
Jean-Marie Boudry, Maurepas, FR;
Bull S.A., Paris, FR;
Abstract
A time constant circuit for regulating the phases of clock signals of a synchronous system includes a plurality of transfer gates composed of MOS-type transistors whose drain-source leads constitute resistance elements. The time constant is adjusted by selectively activating transfer gates, the capacitance of the circuit being the total structural capacitance of the MOS transistors. To ensure that the capacitance remains constant, each transfer gate is associated with an auxiliary compensating circuit which, when activated, introduces a capacitance of the same value as the capacitance of the gate in the conducting state. The invention likewise relates to a variable-delay circuit using the time constant circuit.