Voltage controlled oscillator

Details Voltage controlled oscillator Voltage controlled oscillator

2007-09-11

2007-09-11

Chang, Joseph (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE

Reexamination Certificate

active

11181129

ABSTRACT:
In a voltage controlled oscillator including an amplifier, a feedback circuit and a crystal oscillator, two MOS transistors M1, M2are connected for use as variable capacity elements for the frequency adjustment of the voltage controlled oscillator. Drains of the MOS transistors M1, M2are respectively connected to an XT terminal and an XTB terminal of the crystal oscillator. Sources of the MOS transistors M1, M2are made common and connected to a grounding terminal via a capacitor C3. Gates of the MOS transistors M1, M2are made common, and an added voltage signal of a temperature compensating signal voltage and an external frequency control signal voltage is applied to the common gate terminals of the MOS transistors to thereby perform the frequency control of the oscillator.

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International Search Report for Application No. PCT/JP2004/002635 dated Jun. 15, 2004.

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