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. 06, 1990
Filed:
Jul. 18, 1988
U.S. Philips Corporation, New York, NY (US);
Abstract
A comparison circuit (1), obtained according to MOS technology, for comparing two input voltages and comprising a differential amplifier (8). During a first time period, a first input (-) of the differential amplifier is supplied, via a first capacitor (9) and a switch (10), with a first input voltage (Ue). During a second time period, succeeding the first time period, a second input voltage (Ud) is supplied to the first input (-) of the amplifier by means of the first capacitor and a switch (11) of a switch arrangement (10, 11). The second input (+) of the differential amplifier is connected to a reference voltage during the first time period and its output is at that time connected to the first input and to the second input (+) of the amplifier via switches (12) and (16), respectively. The second input (+) of the differential amplifier is connected through a second capacitor (13) and a change-over device (14, 15) to the reference voltage source (17). The change-over device (14, 15) alternately connects, during the two time periods, the second capacitor to the reference voltage source.