DIGITAL TRANSMISSION CIRCUIT AND THE METHOD OF DECIDING DIVIDING RATE

摘要

A circuit for demultiplying a reference clock used in a digital transmission circuit is disclosed. The digital transmission circuit comprises a selection circuit(8) for selecting one reference clock among a number of inputted reference clocks; a circuit(12) for demultiplying the selected reference clock; and a demultiplying control circuit(10) for controlling the demultiplying of the demultiplying circuit in response to the reference clocks and the selected reference clock.