A 1.8 – 6.3 GHz Quadrature Ring VCO-based Fast-settling PLL for Wireline I/O in 55nm CMOS

A wide-operating range quadrature ring voltage controlled oscillator (VCO) based phase locked loop (PLL) having a phase frequency detector (PFD) with dead-zone removal and current mismatch reduction techniques is presented in this work. The quadrature ring VCO is capacitively-controlled and current-tuned to provide a 1.8 to 6.3 GHz operating range of frequency making it appropriate for a wide variety of wireline and wireless applications. The PLL prototype has been fabricated in a 55 nm CMOS process. The PLL has an active area of 0.079 mm
²
, consumes a maximum power of 6.4 mW from 1.0 V supply and has a RMS jitter of 164 fs at 5 GHz.