A 8 Phases 192MHz crystal-less clock generator with PVT calibration

A multi-phase crystal-less clock generator (MPCLCG) with a process-voltage-temperature (PVT) calibration circuit is proposed. It operates at 192 MHz with 8 phases outputs, and is implemented as a 0.18 μm CMOS process for digital power management systems. A tem- perature calibrated circuit is proposed to align operational frequency under process and supply voltage variations. It occupies an area of 65 μm 75 μm and consumes 1.1mW with the power supply of 1.8V. Temperature coefficient (TC) is 69.5 ppm/°C from 0 to 100°C, and 2-point calibration is applied to calibrate PVT variation. The measured period jitter is a 4.58- ps RMS jitter and a 34.55-ps peak-to-peak jitter (P2P jitter) at 192MHz within 12.67k-hits. At 192 MHz, it shows a 1-MHz-offset phase noise of 102 dBc/Hz. Phase to phase errors and duty cycle errors are less than 5.5% and 4.3%, respectively.