Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By varactor
Patent
1976-09-17
1978-02-14
Goldberg, Gerald
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By varactor
363159, H02M 506
Patent
active
040743470
ABSTRACT:
A varactor multiplier circuit is driven by a pulsed source of radio frequency and self-biased such that it operates in its snap condition to generate harmonic frequencies. The output pulse has essentially the same configuration and length as the input pulse. These pulse envelopes may have a relatively slow voltage build-up with time. A separate bias drive circuit is directly connected to the varactor and provides a negative-going pulse of sufficient voltage to bias the varactor to its off condition. This gating bias pulse is variable as to pulse width and is very steeply rising and serves to either turn on or cut off the varactor sharply to thus provide a shaped envelope of the output wave form. An isolating capacitor and a band stop filter operate to prevent loading of the multiplier circuit by the bias drive circuit and to prevent radio frequency leakage into the drive circuit. A bandpass filter at the output of the varactor circuit serves to limit the output frequency to the desired harmonic of the input signal. This arrangement permits switching of high frequency signals at comparatively high power without the use of a separate gating stage with its accompanying insertion loss.
REFERENCES:
patent: 3185914 (1965-05-01), Gunn
patent: 3358215 (1967-12-01), Swan
patent: 3611110 (1971-10-01), Corbey et al.
patent: 3713014 (1973-01-01), Wagner
Goldberg Gerald
Smith Robert C.
The Bendix Corporation
Thornton William F.
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