REFERENCE CLOCK DISTRIBUTOR UNIT OF WIRELESS LOCAL NETWORK SYSTEM

摘要

PURPOSE: A reference clock distributor unit of a wireless local network system is provided to generate a sinusoidal wave of 10MHz without using a 65.536MHz oscillation circuit. CONSTITUTION: A reference clock distributor unit of a wireless local network system comprises a select and division part(31) which selects a good clock of 2.048MHz and 8KHz clock signals and divides the selected clock so as to generate a 4KHz clock. A division circuit(32) divides an input clock of 32.768MHz to output clock signals of 4KHz and 16.384MHz. A mixer circuit(33) mixes the 4KHz clock from the division part(31) and the clock signals of 4KHz and 16.384MHz. A RAM(34) temporarily stores the mixed result of the mixer circuit(33). A control part(36) drives a 10MHz oscillation circuit(37) according to the data stored in the RAM and a program stored in a ROM(35) so as to generate various reference clocks. A sinusoidal wave TTL conversion circuit(38) converts the 10MHz oscillation frequency from the 10MHz oscillation circuit(37) into a sinusoidal wave clock. A sinusoidal wave conversion circuit(39) converts an output of the conversion circuit(38) into a sinusoidal wave clock of 10MHz. A 32.768MHz oscillation circuit(40) generates a clock of 32.768MHz according to an output of the sinusoidal wave conversion circuit(39). A 1/N division circuit(50) divides the clock of 32.768MHz by different division rates to generate various reference clock signal.