Crystal oscillator and method with amplitude and phase control

Details Crystal oscillator and method with amplitude and phase control Crystal oscillator and method with amplitude and phase control

1991-09-10

1993-02-09

Grimm, Siegfried H.

Oscillators

Plural oscillators

331 65, 331105, 331158, 331175, 331183, 455295, H03B 104, H03B 532, H04B 1500

Patent

active

051855852

ABSTRACT:
Crystal oscillator and method which in one embodiment have a crystal element connected in a positive feedback loop with a charge amplifier and an integrator, with the gain of the loop being maintained at a level of unity. Compensation is provided to offset the effects of shunt capacitance in the crystal element, and precise phase control is maintained around the loop. In other embodiments, a crystal element is connected in a series feedback loop with a buffer amplifier, and operation is provided by maintaining the oscillation signal at level at which distortion, clipping, and saturation do not occur. Compensation for shunt capacitance across the crystal element is provided by applying a compensation signal which is equal in amplitude but opposite in phase to the signal passing through the shunt capacitance to the input terminal of the buffer amplifier to cancel the effect of the shunt capacitance. Compensation is also provided to cancel interfering crosstalk signals between oscillators in systems with more than one oscillator.

REFERENCES:
patent: 3731230 (1973-05-01), Cerny, Jr.
patent: 3735266 (1973-05-01), Amitay
patent: 4358742 (1982-11-01), Ferriss
patent: 4571558 (1986-02-01), Gay et al.
patent: 4646033 (1987-02-01), Perkins
patent: 4810922 (1989-03-01), Hirsch

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