Design of a clock and data recovery circuit in FDSOI technology for high speed serial links

Abstract

The purpose of this thesis is to design an 8 Gbps clock and data recovery circuit intended to work in the receiver of a high-speed Serializer-Deserializer interface (SerDes). The proposed architecture is based on a phase-locked loop operation (PLL) that integrates a linear phase detector, a charge pump, a wide-tuning range voltage-controlled ring oscillator (2.5- 12 GHz), and a third order low pass filter that achieves a bandwidth of 150 MHz. A wide loop bandwidth is considered in the design to achieve a high input jitter tolerance and a fast locking time. Implemented in 22 nm FDSOI, the overall circuit draws 1.38mW from a 0.8V power supply, exhibits a recovery clock RMS jitter of 0.970 fs and and requires a locking time of 22 ns. A Monte Carlo analysis has been performed applying temperature and voltage corners of -40 C to 125 C and 0.72 V to 0.88 V respectively. The results indicated a 95.6% success rate. By using an external voltage that has been implemented to adjust the phase detector's bias current, 100% success rate is achieved.