Oscillator starting control circuit

Details Oscillator starting control circuit Oscillator starting control circuit

2005-09-29

2009-02-17

Pascal, Robert (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S17700V

Reexamination Certificate

active

07492231

ABSTRACT:
An oscillator starting control circuit capable of shortening a starting time and stably controlling the starting time, and furthermore, stabilizing an oscillating frequency after starting an oscillating circuit. An oscillating circuit (1) is a crystal oscillating circuit in which an input and an output of an inverter (14) are connected to both ends of a crystal oscillator (15) and both ends of a resistor (16), the input is connected to a drain of an MOS variable capacity (10), the output is connected to a drain of an MOS variable capacity (11), a source of the MOS variable capacity (10) is connected to a fixed capacity (12), a source of the MOS variable capacity (11) is connected to a fixed capacity (13), and the other ends of the fixed capacities (12, 13) are connected to a GND.

REFERENCES:
patent: 6040744 (2000-03-01), Sakurai et al.
patent: 6172576 (2001-01-01), Endo et al.
patent: 6710669 (2004-03-01), Hasegawa et al.
patent: 7009460 (2006-03-01), Wilcox
patent: 9-326638 (1997-12-01), None
patent: 11-088052 (1999-03-01), None
patent: 2001-24435 (2001-01-01), None
patent: 2002-237722 (2002-08-01), None
Japanese Office Action, with English Translation, issued in corresponding Japanese Patent Application No. 2005-275362, dated on Dec. 5, 2007.

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