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. 03, 1999
Filed:
Oct. 22, 1997
Yung-Chow Peng, Hsinchu, TW;
Gwo-Shu Chiou, Hsinchu, TW;
Winbond Electronics Corp., Hsinchu, TW;
Abstract
An offset-free switched capacitor circuit selectively operated by a non-overlapping two-phase clock signal for processing a frequency shift keying (FSK) input signal is provided. The switched capacitor circuit includes a filter which inputs a voltage signal for generating an output signal which assumes a first voltage value Vt1 at the first phase of the clock signal and assumes a second voltage value Vt2 at the second phase of the clock signal. The output signal of the switched capacitor circuit is an input to a succeeding hysteresis limiter. The hysteresis limiter, which receives the difference of Vt2 and Vt1, is operative to generate a logic signal which is HIGH when an input signal thereof exceeds a HIGH.sub.-- ref signal and is LOW when the input signal thereof falls below a LOW.sub.-- ref signal, and is so operated that the offset voltage associated with the amplifier therein is counterbalanced via internal operation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile