Universiti Kebangsaan Malaysia
Radios, mobile phones, televisions, computers, are just a few models that depend on PLLs for right process that has been used widely in the communications world. A PLL is a control system that produces an output signal. The phase is linked to the phase of an input reference signal. There are comprised of a phase detector and a variable frequency oscillator. A low power 6-bit CMOS ring based Digitally Controlled Oscillator (DCO) design is presented. The design is proposed based on Binary-to-Thermometer (BT) decoder current mirror Digital-to-Analog Converter (DAC) and ring-based Voltage Controlled Oscillator (VCO).