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:
Jul. 06, 1982
Filed:
Jun. 23, 1980
Herbert J Wolkstein, Livingston, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A serrodyne includes a phase shifting circuit adapted to receive a sawtooth modulating signal for providing frequency translation of a radio frequency signal which can be at any of a range of input frequencies. The serrodyne also includes a discriminator which produces in response to the input RF signal a voltage of amplitude proportional thereto. The serrodyne further includes a circuit producing a sawtooth voltage waveform of period 1.div.m, where m is the amount of frequency shift desired in the serrodyne. The sawtooth waveform is applied to the phase shifting circuit. The sawtooth waveform is amplified by an amplifier to which is applied the sawtooth voltage waveform and the signal from the frequency discriminator. The amplification is such that the peak-to-peak magnitude of the amplified waveform is dependent on the amplitude value of the voltage from the frequency discriminator and causes the serrodyne frequency to be shifted by 360.degree. at any of the range of input frequencies.