Crystal oscillator with wide tuning range

Details Crystal oscillator with wide tuning range Crystal oscillator with wide tuning range

2007-01-30

2007-01-30

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S1160FE, C331S135000, C331S162000

Reexamination Certificate

active

11071443

ABSTRACT:
A crystal oscillator having a crystal filter with multiple crystals in a ladder configuration, resonant at a desired operating frequency. An oscillatory signal loop feedback path includes a voltage controlled phase shifter operable to shift the phase of the signal in the feedback loop in response to an applied control voltage. The feedback loop also includes a loop phase shift circuit to ensure that the feedback signal is a multiple of 360°, and a band pass mode selection circuit for eliminating unwanted frequencies.

REFERENCES:
patent: 4851790 (1989-07-01), Driscoll
patent: 5250871 (1993-10-01), Driscoll et al.

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