The TLC2934, a mixed signal IC designed for phase-locked-loop (PLL) systems, is composed of a voltage-controlled oscillator (VCO) and an edge-triggered-type phase frequency detector (PFD). The internal VCO is based on the TLC2932 and TLC2933s ring oscillator. It oscillates in wider frequency with lower supply voltage, and it has stable oscillating performance. The oscillation function, provided by only one external resistor connection, supplies bias to the VCI internal circuit. Oscillator range is covered from 10 MHz to 130 MHz with a 3.3-V supply voltage. The VCO has an inhibit function to stop oscillation and for the power-down mode.