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:
Apr. 28, 1998
Filed:
Jul. 12, 1996
Victor Mycynek, Des Plaines, IL (US);
Gary Sgrignoli, Mt. Prospect, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A FPLL has first second and third multipliers with the first multiplier supplying demodulated signals to a limiter and the second multiplier supplying signals to the loop filter. A VCO and phase shift circuit supply quadrature signals to the first multiplier and to the third multiplier which is relocated to an AC path in the loop to avoid the effects of offsets due to stray DC voltages and currents. The limiter output is applied to the third multiplier. The third multiplier supplies its output to the second multiplier. An integrated circuit embodiment using an exclusive OR gate as the third multiplier is also shown.