Patent ID: 6346862
Filing Date: 2002-02-12
Classification: H03B

Abstract:
A quartz oscillation circuit having improved stability and performance comprising:a CMOS inverter; a quartz oscillator connected between input and output terminals of said CMOS inverter; a feedback resistor connected between said input and output terminals of said CMOS inverter; a first capacitance element provided between a first connection point of said input terminal of said CMOS inverter and said quartz oscillator and a power supply terminal having a particular potential; a second capacitance element provided between a second connection point of said output terminal of said CMOS inverter and said quartz oscillator and said particular potential power supply terminal; and current limiting resistors having resistance values set for stability and startability of the quartz oscillation circuit while ensuring that there is no damage to a quartz crystal of the quartz oscillation circuit, said resistors provided at any one of a plurality of points of between said first connection point and said first capacitance element, between said first capacitance element and said power supply terminal; between said second connection point and said second capacitance element and between said second capacitance element and said power supply terminal to limit current provided to said quartz oscillator; wherein a sum of said resistance values of said current limiting resistors lies in a range of from 10&OHgr; to 320&OHgr;.