H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/52, 331/59
H03B 5/04 (2006.01) H03B 5/32 (2006.01) H03B 5/36 (2006.01) H03H 9/19 (2006.01) H03L 7/00 (2006.01) H04M 1/73 (2006.01)
Patent
CA 2038967
Frequency compensation for a crystal oscillator circuit whose oscillation frequency is dependent on source voltage applied thereto. When a capacitor is added to the frequency compensation terminal of the crystal oscillator circuit, the circuit changes the oscillation frequency thereof on the basis of the capacitance of the capacitor. A source voltage detector compares the source voltage being applied to the crystal oscillator circuit with a predetermined reference voltage and produces a control signal matching whether the source voltage is higher or lower than the reference voltage. On receiving the control signal, a control switch turns on or off the contact thereof to add or not to add the capacitor to the frequency compensation terminal. Assuming that the characteristic of the crystal oscillator circuit is such that the oscillation frequency decreases with the decrease in the source voltage, when the source voltage is low, the capacitor for frequency compensation is not added so as to increase the oscillation frequency of the crystal oscillator. Conversely, when the characteristic is such that the oscillation frequency increases with the decrease in the source voltage, the capacitor is added so as to decrease the oscillation frequency.
Corporation Nec
Smart & Biggar
LandOfFree
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