Patent ID: 6882835
Filing Date: 2005-04-19
Classification: H03B,H03L

Abstract:
1. An oscillator comprising: a voltage-controlled oscillation circuit including a vibrator, frequency of an output signal thereof changing in accordance with a control voltage supplied thereto; a first temperature compensation circuit for outputting a first temperature compensation voltage for temperature-compensating a frequency-temperature characteristic of the vibrator according to a cubic curve model that approximates a frequency-temperature characteristic of the vibrator; a second temperature compensation circuit for outputting a second temperature compensation voltage for temperature-compensating a frequency-temperature characteristic of the vibrator according to a linear line model that approximates a frequency-temperature characteristic of the vibrator; and selection means for supplying either a sum voltage of the first temperature compensation voltage and the second temperature compensation voltage or the second temperature compensation voltage to the voltage-controlled oscillation circuit as the control voltage.