Oscillators – Automatic frequency stabilization using a phase or frequency... – With intermittent comparison controls
Patent
1977-09-15
1978-10-31
Kominski, John
Oscillators
Automatic frequency stabilization using a phase or frequency...
With intermittent comparison controls
331 17, 331173, 331117D, 331 36C, H03B 304
Patent
active
041237269
ABSTRACT:
A circuit for synchronizing an oscillator keyed by a pulse is provided with a low amplitude reference oscillation. A phase shift regulating loop has a phase discriminator which is fed, on one hand, with a branched component of the oscillator output and, on the other hand, with the reference oscillation. The phase discriminator compares the phases of the two oscillators and emits a resultant regulating voltage an adjustable reactance for controlling the oscillator frequency during the leading edge of the keying pulse. A phase shift device, adjustable over 180.degree., is connected between the oscillator and the phase discriminator, the phase discriminator having a high-ohmic output which is connected, via an impedance converter, to the adjustable reactance. A sampling switch is interposed between the impedance converter and the adjustable reactance, the switch being closed at the beginning of a pulse and opened shortly before the end of a pulse, the pulses being of predetermined duration, and a holding circuit holds the regulating voltage at least to an approximate value across the adjustable reactance prior to the end of a pulse, until the closing of the sampling switch.
REFERENCES:
patent: 3546618 (1970-12-01), Menkes
patent: 3573649 (1971-04-01), West
patent: 3609577 (1971-09-01), Bos
patent: 3921095 (1975-11-01), Chu
patent: 3991378 (1976-11-01), Schaefer
Kominski John
Siemens Aktiengesellschaft
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