A Wide-Tracking Range Clock and Data Recovery Circuit
SCALING of CMOS technology has progressed relentlessly for the past several decades and brought unprecedented benefits to digital Integrated Circuits (ICs). In order for the improvements of individual ICs to benefit the overall system, the performance of inter-chip communication circuits must also scale accordingly. To meet this growing demand for large Input - Output (IO) bandwidth, systems such as network switches and processor-memory interfaces employ hundreds of IO links to achieve an aggregate IO bandwidth in excess of 100 Gb/s. It consists of a transmitter, a channel, and a receiver. The transmitter sends the data to the receiver over a channel, typically a printed circuit board trace or a co-axial cable.