DISTRIBUTION OF CLOCK SIGNALS

摘要

The invention concerns an arrangement for transmission of certain clock signals in a series of clock signals by means of signals of lower frequency compared to the frequency of said series of clock signals. From said signals of lower frequency well-defined pulses are extracted for controlling logic equipment located distantly from the clock pulse source. The arrangement includes at the sender side a clock pulse generator producing said series of clock signals, a counter which is stepped by said series of clock pulses and produces at least two pulse series phase displaced with respect to each other where the length of the pulses of said pulse series is a multiple of the length of the pulses of the first mentioned clock pulse series. The phase displacement between said at least two pulse series corresponds to half the length of the pulses of said clock pulse series. The frequency of said at least two pulse series is lower than the frequency of said clock pulse series. The arrangement also includes two transmitters for transmission of said two pulse series. At the receiver side the arrangement includes two receivers for receiving the two pulse series transmitted through the line, a logical circuit detecting the two phase displaced pulse series and depending on a defined ratio between the amplitudes of the two signals, delivering a pulse during the duration of said defined ratio.