A linear high capture range CDR with adaptive loop bandwidth for SONET application

Abstract

A linear referenceless CDR with adaptive loop bandwidth suitable for OC-192 SONET transceiver is presented. The system employs a linear Hogge PD with enhanced capture range technique for a better jitter performance. Improved jitter transfer is also obtained utilizing an adjustable loop bandwidth. The proposed CDR Operates at 9–11 Gb/s with 3.5–7 MHz adjustable loop bandwidth and enhances jitter transfer by 3 dB for a 27-1 PRBS input. Jitter parameters of CDR system are compatible with OC-192 jitter requirements.