Patent ID: 7279991

Claim:
A semiconductor integrated circuit with a PLL circuit, comprising: a voltage-controlled oscillator; a phase comparator for comparing a phase of an oscillation signal generated by the voltage-controlled oscillator with a phase of a reference signal and generating a signal according to a phase difference thereof; a charge pump circuit operated by the signal generated by the phase comparator; and a loop filter for smoothing an output of the charge pump circuit, the voltage smoothed by the loop filter being supplied to said voltage-controlled oscillator to control an oscillation frequency, wherein a resistive element and a capacitive element as components of said loop filter are formed over a semiconductor chip on which elements of said PLL circuit are formed, said resistive element is constructed by a plurality of elements having different resistance values, and any of the resistive elements is selectively connected, wherein the semiconductor integrated circuit further comprises a correcting circuit for changing current of said charge pump circuit in accordance with the selection of said resistive element, and wherein said charge pump circuit comprises a plurality of resistive elements having different resistance values, and said change in current is performed by selecting any of said resistive elements in the charge pump circuit.