OSCILLATOR AND PLL CIRCUIT USING THE SAME

摘要

An oscillator (1083) having a modulation function capable of controlling a frequency by adding a signal to a control signal and a PLL (108A) circuit using the same, wherein the oscillator forms a ring (200) comprised of a plurality of cascade connected delay stages (201-203) controlled in delay value by an inverter or a buffer and a control signal and forming a closed loop by an inverted phase and comprises a modulation function modulating an oscillation frequency by adding a modulation signal to the control signal in a part of the plurality of delay stages.