VFO having plural feedback loops

Details VFO having plural feedback loops VFO having plural feedback loops

1979-06-25

1981-08-25

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331177R, H03B 536

Patent

active

042862353

ABSTRACT:
An oscillator including a resonator having a primary feedback loop for causing oscillations to occur at a desired frequency and a secondary feedback loop including a multiplier for causing variations of said frequency in response to an input signal manifestation. Spectral purity is enhanced and potential overtone oscillations are suppressed by a cascade connection of lag networks in the primary loop which exhibit a low-pass transfer characteristic and provide at least .pi. radians of phase shift, one of the networks being shared in common with the secondary loop for supplying a quadrature signal to the multiplier.

REFERENCES:
patent: 3585285 (1971-06-01), Rennick
patent: 3691475 (1972-09-01), Mouri et al.
patent: 3763439 (1973-10-01), Peil
patent: 3973221 (1976-08-01), Jett, Jr.
patent: 4020500 (1977-04-01), Harwood
patent: 4055817 (1977-10-01), Watanabe et al.
patent: 4081766 (1978-03-01), Gay
patent: 4128817 (1978-12-01), Gomi
patent: 4132964 (1979-01-01), Wilcox

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