Oscillators – Solid state active element oscillator – Transistors
Patent
1990-04-09
1990-09-25
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331158, 331177R, H03B 536
Patent
active
049596241
ABSTRACT:
A crystal oscillator circuit for use with overtone crystals restricts its resonant frequency to either fundamental or overtone frequencies. An inverting amplifier, which provides 180 degrees of phase shift by inverting an input signal, includes components which effectively provide another 180 degree phase shift at a particular frequency by adding a time delay. The 180 degree phase shift by a signal inverting amplifier, with the included 180 degree phase shift provided by the time delay comprises an oscillator by the addition of a crystal with a resonant frequency equal to the particular frequency determined by the time delay. Suppression of unwanted oscillation frequencies is accomplished by adjusting a current source, which changes time delay, without using inductors or other reactive components.
REFERENCES:
patent: 3577099 (1971-05-01), Hall et al.
patent: 3845410 (1974-10-01), Steel
patent: 3875533 (1975-04-01), Irwin et al.
patent: 4128817 (1978-12-01), Gomi
patent: 4139826 (1979-02-01), Pradal
patent: 4743865 (1988-05-01), Chauvin
Higgins, Jr. Robert J.
Irwin James S.
Ooms William J.
Grimm Siegfried H.
Krause Joseph P.
Motorola Inc.
Parmelee Steven G.
Sarli Anthony J.
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