Semiconductor integrated circuit operable as a phase-locked loop

摘要

A semiconductor integrated circuit (10) generating a stabilized oscillation signal based on an input signal is disclosed. The circuit includes a plurality of unit circuits (20A, 20B) connected in series, each of the unit circuits having at least an oscillator (203), a divider (204), and a phase comparator (201) which construct at least one part of a phase-locked loop. In the unit circuit, a frequency of an oscillation output signal (203a-2) of a latter one (20B) of the unit circuits is larger than that of an oscillation output signal (203a-1) of a former one (20A) of the unit circuits. <IMAGE>