| 摘要 |
PURPOSE:To obtain a clock reproducing circuit which is strong against the DC level variance and quickly responds by always detecting the zero-crossing point of a signal with the correct phase. CONSTITUTION:The output of a discriminator 2 is distributed to two systems, and one is subjected to A/D conversion and is averaged in an adder 12 by addition for a certain time or addition of a certain number of data and is subjected to D/A conversion and is applied as the reference voltage to a comparator 4, and thereby, this voltage accords with the DC level variance of the signal. Consequently, the clock reproducing circuit which is strong against the DC level variance and has a short rise time is obtained. |
