Pulse repetition frequency pushing compensation circuit

Details Pulse repetition frequency pushing compensation circuit Pulse repetition frequency pushing compensation circuit

1991-03-04

1991-11-05

Mis, David

Oscillators

Frequency stabilization

331 99, 331173, 331176, 331177V, H03B 504, H03B 518, H03B 712, H03L 102

Patent

active

050633600

ABSTRACT:
A pulse repetition frequency (PRF) pushing compensation circuit to negate PRF-induced frequency shifts and ambient temperature change-induced frequency shifts in pulsed RF sources. The PRF pushing compensation circuit samples PRF voltage and feeds it into a resistor-capacitor (RC) network so that the DC voltage component across the capacitor is directly proportional to the PRF. The DC voltage is then amplified, via a transistor, and fed to a varactor diode circuit coupled to the source's frequency determining element (e.g., dielectric resonator, microwave cavity, or other element). With a varactor diode tuning the source, the capacitor voltage derived from the PRF voltage is applied to the varactor diode to effect a frequency shift in the pulsed RF source which is equal and off-setting to the PRF-induced frequency shift. Temperature sensitive resistors can be used in the DC offset voltage of the varactor diode circuit to compensate for frequency changes due to ambient temperature variances.

REFERENCES:
patent: 4843347 (1989-06-01), Sigmon et al.

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