Applied voltage control circuit for voltage controlled...

Details Applied voltage control circuit for voltage controlled... Applied voltage control circuit for voltage controlled...

2008-05-06

2008-05-06

Lee, Benny (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S158000, C331S17700V

Reexamination Certificate

active

07369006

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.

REFERENCES:
patent: 4956618 (1990-09-01), Ulmer
patent: 6791421 (2004-09-01), Oita
patent: 7009460 (2006-03-01), Wilcox
patent: 2002/0171500 (2002-11-01), Hasegawa et al.
patent: 2002-237722 (2002-08-01), None

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