A METHOD AND A CIRCUIT FOR RECOVERING A DIGITAL DATA SIGNAL AND A CLOCK FROM A RECEIVED DATA SIGNAL

摘要

By application of a method for recovering a digital data signal (Dout) and a clock signal (Ckout) from a received data signal (Din) consisting of a number of successive bits, a clock signal is produced from the received data signal by means of a resonator circuit (5). The recovered data signal is produced by sampling the received data signal with the recovered clock signal. The received data signal and the recovered clock signal are phase locked to each other so that the received data signal is sampled approximately in the centre of every bit. By phase locking the two signals to each other immediately prior to the sampling, the effect of varying time delays to which the two signals have been subjected individually on their way through the circuit is neutralised, and every sampling may be performed precisely within the very short time during which the data signal is stable.