Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2007-04-17
2007-04-17
Kinkead, Arnold (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S1160FE, C331S1160FE, C331S176000, C331S066000
Reexamination Certificate
active
10522562
ABSTRACT:
A temperature-compensated piezoelectric oscillator includes an AT-cut quartz crystal resonator, an amplifying circuit connected to one end of the quartz crystal resonator, a varactor diode connected to the other end of the quartz crystal resonator, and a temperature compensation voltage generation circuit connected to ends of the varactor diode via resistors. The temperature compensation voltage generation circuit includes a first voltage generation circuit that includes thermistors and resistors and that is connected to the cathode of the varactor diode, and a second voltage generation circuit that includes a thermistor and resistors and that is connected to the anode of the varactor diode (VD).
REFERENCES:
patent: 4412188 (1983-10-01), Helle et al.
patent: 63-300609 (1988-12-01), None
patent: 01-081018 (1989-05-01), None
patent: 6-224635 (1994-08-01), None
patent: 2002-076773 (2002-03-01), None
patent: 2002-135053 (2002-05-01), None
patent: 2004-048643 (2004-02-01), None
Keating & Bennett LLP
Kinkead Arnold
Murata Manufacturing Co. Ltd.
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