CRYSTAL OSCILLATOR CIRCUIT AND BROADCAST RECEIVER USING SAME

Japanese Patent JP3021210

B2

PURPOSE: To provide a crystal oscillator circuit with oscillation frequency selection function reducing the IC chip area and also decreasing the number of terminal pins.
CONSTITUTION: A crystal oscillator circuit consists of an inverter 1, an output resistor RD connected to the output side of the inverter 1 through either one of both ends of the resistor, a crystal oscillator 2 connected to the other end of the resistance RD through either one of both ends of the oscillator 2 and connected to the input side of the inverter 1 through the other end of the oscillator 2 respectively, a pair of capacitors C1 and C2 connected to both ends of the oscillator 2 through either one of both ends of each capacitor and then connected to an earth point through the other end of each capacitor, and a feedback resistor Rf which secures the connection between the input and output sides of the inverter 1. In such a constitution, two crystal oscillators 2a and 2b having different frequencies are set in parallel to each other. Meanwhile the value of both resistors RD and Rf are switched over by the switches 5 and 6. Thus both oscillators 2a and 2b are alternatively actuated.

WO/2005/099083	OSCILLATION CIRCUIT AND ELECTRONIC DEVICE
JP6727937	Electronic device
JPH0548333	CRYSTAL OSCILLATOR

Tamotsu Suzuki

JP27220692A

March 15, 2000

October 12, 1992

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ROHM Co., Ltd.

H03B5/32; H03C1/00; H03C3/00; H04B1/26; (IPC1-7): H03B5/32

JP451604A
JP5124163A
JP5836027A
JP6370714U

Shizuo Sano

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