Oscillators – With distributed parameter resonator
Patent
1990-08-06
1991-05-28
Mis, David
Oscillators
With distributed parameter resonator
331107R, 331107G, 331175, 331177V, H03B 700, H03B 706, H03L 100
Patent
active
050197916
ABSTRACT:
Flicker (1/f) noise is suppressed in an oscillator by reducing oscillator voltage-frequency pushing to zero. A varactor (56) is incorporated in the resonator circuit and is biased with a tuning voltage setting the varactor to a capacitance value providing the zero oscillator pushing at a given frequency. A common bias connection (62) is provided between the varactor and the active element (64) such that a random perturbation voltage change across the active element also causes a change in voltage across the varactor, to compensate a change in oscillator frequency otherwise caused thereby. The varactor capacitance versus voltage characteristic is shaped such that a change in active element voltage provides a change in varactor voltage, and the combination of these voltage changes results in a zero change in oscillator frequency. The tuning slope of the oscillator provided by the varactor is opposite the tuning slope of the oscillator resulting from a change in active element voltage.
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All Systems, Inc.
Mis David
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