Patent ID: 7103337

Claim:
A semiconductor integrated circuit device for communication, which includes a PLL circuit that has a VCO constituted so as to be capable of perform an oscillation operation in multiple frequency bands and that is capable of outputting an oscillation signal having a frequency in accordance with specified frequency information, said device comprising: a DC voltage source used as a tuning voltage of said VCO, and generating one of a DC voltage having reverse dependence to dependence of said VCO in frequency relative to temperature in the case where the frequency of said VCO increases with increasing of said VCO tuning voltage and a DC voltage having the same dependence as dependence of said VCO in frequency relative to temperature in the case where the frequency of said VCO decreases conversely with increasing of said VCO tuning voltage; a frequency counter for measuring an oscillation frequency of said VCO; a memory circuit for memorizing frequency information measured per each frequency band of said VCO by said frequency counter; and a control circuit for performing calibration by connecting said VCO to said DC voltage source, oscillating and operating said VCO in accordance with a DC voltage supplied from said DC voltage source, measuring this oscillation frequency per each frequency band of said VCO by said frequency counter, and memorizing the oscillation frequency in said memory circuit.