Title: Applied voltage control circuit for voltage controlled oscillation circuit
Application Number: 200610072557 Application Date: 2006.04.07
Publication Number: 1845450 Publication Date: 2006.10.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03B5/32
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: wang qi song zhiqiang
Abstract:
     When a power supply is turned on, an NPN transistor is disconnected, a first transmission gate is conducted, a second transmission gate is disconnected, and a power-supply voltage is applied to a control input terminal of a voltage controlled oscillation circuit via the first transmission gate. After oscillation of a quartz resonator is stabilized, the NPN transistor is switched to the conducted state by a control signal applied to a general purpose terminal so that the first transmission gate is switched to the disconnected state, and the second transmission gate is switched to the conducted state. Then, a voltage of the voltage control terminal is applied to the control input terminal of the voltage controlled oscillation circuit via the second transmission gate.
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