查看更多>>摘要:We present a type-II fractional-N hybrid switched-capacitor sampling PLL, using a capacitive digital-to-analog converter (CDAC) as a sampler and an analog adder receiving the digital integrator's output. To guarantee sufficient CDAC settling time and filter switch-on time, we designed a synchronous timing generator utilizing the multi-modulus divider's (MMDIV's) inter-stage clocks. The prototype chip in 65-nm CMOS achieves -80-dBc reference spur, 236-fs integrated RMS jitter, and 4.6-mW power consumption, translating to -246-dB FoM.