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:
Jun. 08, 1982
Filed:
Sep. 21, 1979
William R Weissmueller, Wildwood, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
A method and electronic circuit are described for generating a sawtooth waveform for vertical deflection of a television receiver's cathode ray tube. The method is effected by a circuit which includes a single capacitor which is charged to develop the ramp portion of the sawtooth. In response to a vertical sync pulse, the circuit discharges the capacitor and compares the capacitor's discharge voltage to a predetermined threshold voltage. When the latter two voltages are substantially equal to each other, discharge of the capacitor is discontinued, thus generating a sawtooth waveform across the capacitor. The capacitor begins charging again to form another ramp voltage and is discharged on receipt of the next vertical sync pulse. The charge and discharge of the capacitor repeats as successive vertical sync pulses are received.