Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2006-11-06
2010-06-01
Pascal, Robert (Department: 2817)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C331S1170FE, C331S158000
Reexamination Certificate
active
07728685
ABSTRACT:
A temperature detection circuit (18) detects temperature around an oscillation circuit (20) equipped with voltage variable capacitors (23, 24). According to its temperature detection signal, a temperature compensation circuit (30) produces a voltage signal as a temperature compensation signal. That voltage signal is supplied to the voltage variable capacitors (23, 24) in order to sustain oscillation frequency of the oscillation circuit (20) at a substantially constant level. When a switch element (1) is, turned on by a non-TCXO signal, both terminals of each voltage variable capacitor (23, 24) are brought to the same potential (ground potential). Consequently, each voltage variable capacitor has a predetermined capacitance and temperature compensation function is made ineffective. In that state, initial frequency regulation is performed under normal temperature.
REFERENCES:
patent: 7123105 (2006-10-01), Kim et al.
patent: 7205858 (2007-04-01), Kato
patent: 2005/0040904 (2005-02-01), Sakurai
patent: 2002-151957 (2002-05-01), None
patent: 03-218636 (2003-07-01), None
patent: 2004-147180 (2004-05-01), None
patent: 03 063335 (2003-07-01), None
patent: WO 2005020427 (2005-03-01), None
International Search Report of PCT/JP2006/322085, date of mailing Jan. 23, 2007.
Furuki Takuo
Masuda Takashi
Nakamura Rikoku
Citizen Finetech Miyota Co., Ltd.
Citizen Holdings Co. Ltd.
Johnson Ryan J
Pascal Robert
Westerman Hattori Daniels & Adrian LLP
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