Oscillators – Single oscillator with plural output circuits – Plural outputs of diverse wave form
Patent
1991-05-20
1992-05-12
Grimm, Siegfried H.
Oscillators
Single oscillator with plural output circuits
Plural outputs of diverse wave form
331 75, 331116R, 331158, H03B 536
Patent
active
051131536
ABSTRACT:
A crystal oscillator circuit wherein first and second transistors are connected to form a differential pair. The second transistor functions as an inverting gain stage for the oscillator and two capacitors are provided to complete a feedback path in series with a crystal which essentially functions as an inductor. The capacitors are large enough to minimize the effect of device parasitics and small enough for monolithic implementation. The square-wave output from the circuit is completely isolated from the oscillator gain stage, thus subsequent logic gates will not have any effect on the oscillator performance and DC-coupling can be used without a need for AC-coupling capacitors. The circuit is completely monolithic, requiring only an external crystal. The circuit inherently suppresses the fundamental frequency without a need for a tank circuit or a feedback resistor and does not influence the biasing. The circuit has a completely isolated square-wave output in addition to a sinusoidal output, and reliable high frequency operation with a third-overtone crystal is possible at frequencies from 35 MHz to 70 MHz.
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Goodwin John J.
Grimm Siegfried H.
International Business Machines - Corporation
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