Title: Voltage-controlled oscillator
Application Number: 200610164270 Application Date: 2006.12.07
Publication Number: 1980052 Publication Date: 2007.06.13
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03B5/32;H03B5/36
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name: Tateyama Yuichi;Otsuka Takashi
Attorney & Agent: huangxiao lin wangzhi sen
Abstract:
    To provide a provide a voltage-controlled oscillator capable of controlling the threshold voltage of a MOS transistor independently of a temperature compensation control signal and an external voltage frequency control signal while securing linearity and downsizing the oscillator size without reducing the variable range of frequency, the voltage-controlled oscillator includes an amplifier, a piezoelectric vibrator, and a first load capacitor and a second load capacitor arranged as the load capacitors between both terminals of the piezoelectric vibrator, wherein a capacitor provided as the first load capacitor is composed of a variable capacitor with a small change in capacitance with respect to an input voltage and a capacitor provided as the second load capacitor is composed of a variable capacitor with a large change in capacitance with respect to an input voltage. This makes it possible to arbitrarily determine the output bias of a temperature compensation control circuit and an external voltage frequency control circuit.
Time: 10
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