Major concerns in clock recovery of Manchester-encoded data using a phase lock loop

Signals traveling in communication systems pick up noise and delays while traversing in their respective mediums. Also, the data is asynchronous when we take into consideration the receiver and the transmitter clocks. For effective communication between the two units there should be a mechanism of recovering the original clock and signal from the asynchronous and distorted or noisy signal---thus the need for a Clock Recovery Circuit.; The target application is the recovery of clock and data from Manchester encoded data stream generated by a Manchester Encoder-Decoder designed using the Harsh Environment Cell Library developed in the MSVLSI lab. This thesis also presents the successful test results for the 16 bit (single write) Manchester encoder/decoder pair for temperatures up to 195°C.; In any Clock Recovery System the PLL is the crucial block. The PLL charge pump generates the control signal for the Voltage Controlled Oscillator; any disturbance on its output adversely affects the performance of the VCO. (Abstract shortened by UMI.)...