A PVT-Tolerant Injection-Locked Clock Multiplier With a Frequency Calibrator Using a Delay Time Detector

摘要

An injection-locked clock multiplier (ILCM) using a frequency calibrator is presented to tolerate the process, voltage, and temperature variations. By detecting the timing error between the delay cells of a voltage-controlled oscillator (VCO) with and without an injection pulse, the frequency calibrator adjusts the oscillation frequency of a VCO. It reduces the reference spur and improves the rms jitter. This ILCM is fabricated in 40-nm CMOS technology and its active area is 0.012 mm(2). The power is 2.55 mW from a supply of 1.1 V at 2.4 GHz with 150-MHz reference frequency. The measured reference spur is -61.28 dBc and the rms jitter integrated the phase noise from 10 kHz to 100 MHz is 479 fs.