Limiter circuit and voltage controlled oscillator including the same

摘要

A limiter circuit in a voltage controlled oscillator (VCO) includes a first control circuit, a second control circuit and a driving circuit having a pull-up transistor and a pull-down transistor. The first control circuit generates a first driving control signal for controlling the pull-up transistor based on an AC input signal and a first DC bias voltage. The second control circuit generates a second driving control signal for controlling the pull-down transistor based on the AC input signal and a second DC bias voltage. The driving circuit generates an output signal based on the first driving control signal and the second driving control signal. The output signal swings between a first voltage at the pull-up transistor and a second voltage at the pull-down transistor.