On-chip Temperature Compensated 2.5GHz to 10GHz Multi-band LC-VCO Phase Locked Loop for Wireline Applications

An on-chip temperature detection and compensation for a LC-VCO based phase locked loop is presented here. A temperature-sensitive current controlled oscillator based temperature sensor is used to measure the temperature around the phase locked loop (PLL). The effects of self heating and thermal coupling in RF circuits is demonstrated using a PLL. The LC-VCO PLL was designed in 65nm CMOS Low Power process. The output variation due to process variations and self-heating was reduced to 7.5%. The technique shows promise for compensation and correction in high frequency operating systems like millimeter-wave circuits where variations due to self-heating can vary the functional operation greatly.