Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2006-05-23
2006-05-23
Chang, Joseph (Department: 2817)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C331S158000
Reexamination Certificate
active
07049899
ABSTRACT:
A temperature compensated piezoelectric oscillator that is capable of reducing the deterioration of phase noise caused by electrical-current noise, and an electronic device using the temperature compensated piezoelectric oscillator is arranged such that a connection point of a first resistor and a second resistor, which are connected in series between an external frequency control terminal and ground, is connected to the cathode of a variable capacitance diode. Furthermore, a capacitor for bypassing current noise, in which the impedance at a frequency that is lower than the oscillation frequency is sufficiently low so as to be capable of bypassing electrical-current noise generated from the resistors to ground, is provided between the connection point of the resistors and the ground. Electrical-current noise applied to the variable capacitance diode can be reduced, and the phase noise of the oscillation signal can be reduced.
REFERENCES:
patent: 5481229 (1996-01-01), Connell et al.
patent: 5898345 (1999-04-01), Namura et al.
patent: 2001/0017574 (2001-08-01), Oka
patent: 2002-135053 (2002-05-01), None
Chang Joseph
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
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