Patent ID: 8587384

Claim:
A semiconductor integrated circuit device comprising: an inductance-capacitance (LC) oscillator including an induction element, a capacitor, and a variable capacitor which are connected in parallel; and an oscillation-frequency calibrator configured to transmit a control signal for controlling the LC oscillator, based on information for determining an oscillation frequency of the LC oscillator and potential information from a voltage source configured to fluctuate with a monotonic characteristic with respect to temperature, wherein the oscillation-frequency calibrator includes: a storing unit that stores a temperature coefficient that is set based on the information for determining the oscillation frequency and the potential information; and a current source which, in response to the temperature coefficient stored in the storing unit, outputs a first control signal to the variable capacitor by adding up: a first current source having a zero-th order temperature coefficient; a second current source having a first-order temperature coefficient; and a third current source having a second-order temperature coefficient.