Voltage controlled oscillator and electronic system using the same

摘要

A voltage controlled oscillator comprises two XOR logic units and two inverters. A first inverter inverts a first XOR result into a first output signal; a second inverter inverts a second XOR result into a second output signal; a first XOR logic unit performs an XOR logic operation based on an input signal and the second output signal and thus generating the first XOR result; and a second XOR logic unit performs an XOR logic operation based on the first output signal and a reference voltage and thus generates the second XOR result.