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. 13, 1991
Filed:
Aug. 10, 1990
Dieter Janta, Hamburg, DE;
Winfried Jansen, Ellerbek, DE;
U.S. Philips Corp., New York, NY (US);
Abstract
A phase comparison circuit includes a double balanced mixer stage which receives a sine signal as well as this sine signal in anti-phase and a square-wave switching signal of the same nominal frequency, two active current mirror circuits are used which incorporate at least two common negative feedback circuit elements, the first of which is operative in the input-sided negative feedback of the first current mirror circuit and in the output-sided negative feedback of the second current mirror circuit and the second of which is operative in the reverse way. The two current mirror circuits are alternately connected to the two balanced mixer stages by means of a switching stage during the half cycle clock of the switching signal.