Optimization circuit for a serrodyne frequency translator
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United States of America Patent
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Jul 6, 1982
Grant Date -
N/A
app pub date -
Jun 23, 1980
filing date -
Jun 23, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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