INSTANTANEOUS CLOCK AND DATA RESTORATION

摘要

PROBLEM TO BE SOLVED: To obtain a specific frequency again from a burst mode signal by using one signal device. SOLUTION: A clock can be collected from a burst mode signal having a specific frequency by using one device which is similar to American patents No.5, 237, and 290 except that a delay line used in each oscillator with a gate is selected in a controllable state so that oscillators with gates can provide clock signals having multiple frequencies. The same frequency is normally selected for both oscillators with gates. An oscillator with an internal gate is composed of a delay element. Relative frequencies are determined by the ratio of the number of delay elements in various oscillators with internal gates. When a delay element constituting an oscillator with an internal gate is an inverter, a phase splitter is usable so as to obtain secure oscillation even when the number of delay elements is always odd and two ratios are necessary with restored frequencies.