Piezoelectric oscillator

Details Piezoelectric oscillator Piezoelectric oscillator

2008-11-11

2010-12-14

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S160000

Reexamination Certificate

active

07852164

ABSTRACT:
A piezoelectric oscillator includes: a piezoelectric resonator; an oscillation circuit including a variable resistance circuit and a transistor for oscillation; a constant current circuit, the constant current circuit including a first current mirror circuit, and a current control circuit having an output terminal and controlling a current flowing in the first current circuit so as to enable an output current of the constant current circuit to be adjusted, the output terminal of the first current mirror circuit being coupled to at least one of a collector and a base of the transistor for oscillation with the variable resistance circuit; and a control circuit coupled to the current control circuit and the variable resistance circuit, the control circuit controlling the current control circuit and a resistance value of the variable resistance circuit.

REFERENCES:
patent: 6337604 (2002-01-01), Clarke
patent: 6946923 (2005-09-01), Knickerbocker et al.
patent: 2006/0244546 (2006-11-01), Yamamoto
patent: 2006/0267704 (2006-11-01), Stevenson et al.
patent: 10-135741 (1998-05-01), None
patent: 2006-121134 (2006-05-01), None

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