Single-stage oscillator having low-impedance feedback port

Details Single-stage oscillator having low-impedance feedback port Single-stage oscillator having low-impedance feedback port

H - Electricity

03

B

331/66

H03B 5/36 (2006.01) H03C 3/22 (2006.01) H03B 5/12 (2006.01)

Patent

CA 1206540

ABSTRACT A single-crystal oscillator comprising a single transistor and a capacitor divider connected in a feedback path, which includes the crystal input and output ports, be- tween the collector and base of the transistor, thereby to provide a low-impedance input port to the crystal. The impedance of the crystal output port, which is connected to the base of the transistor, is also low. As a result of the low crystal input and output port impedances, the oscillator is capable of operating without any significant levels of spurious crystal frequencies, and can be switched between crystal and voltage-controlled modes of operation without frequency pull or lock-up to the crystal when operating in the voltage-controlled mode.

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