Northrop Grumman Systems Corporation

Karl M Metzger

Michael M Driscoll

Christopher R Vale

Norman G Matthews

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&#xb0;, and a band pass mode selection circuit for eliminating unwanted frequencies.

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Westminster, MD, United States of America

Karl M Metzger