A 1.575GHz, 1.63mW CMOS Injection-Locked Ring Oscillator Powered by FBAR-Based PLL Reference

An injection-locked ring oscillator (ILRO) used for multi-phase clock generation in multi-gigahertz serial links and time-interleaved ADCs, is co-designed with a MEMS-Film Bulk Acoustic Wave Resonator (FBAR)-based, 1.575GHz Integer-N PLL in CMOS. Low-jitter, multi-phase clock generation is obtained using a wide-tracking bandwidth, ring oscillator injection-locked with the FBAR-based PLL. Measured results show an output jitter of 1.2ps RMS at 1.575GHz and phase noise of −116dBc/Hz @1MHz offset. Excluding the power in the output buffers for testing, the ILRO and FBAR-based PLL dissipate 0.88mW and 0.75mW respectively, resulting in a total power of 1.63mW.