HIGH FREQUENCY GENERATING COUNTER OF LASER PRINTER USING RING OSCILLATOR

摘要

PURPOSE: A high frequency generating counter of a laser printer using a ring oscillator is provided which generates a high frequency in order to improve output resolution of the printer. CONSTITUTION: A high frequency generating counter of a printer includes at least two even-numbered inverters, connected in series, for receiving a predetermined pulse, delaying it for a predetermined period of time and toggling it, and a ring oscillator(110) configured of a buffer which receives the output of the last odd-numbered inverter among the inverters, delaying it for the predetermined period of time and sending it to the first inverter. The ring oscillator has a loop structure. The each inverter delays an input tap pulse for the predetermined period of time to output a toggled tap pulse. The number of tap pulses output from the ring oscillator is determined by the inverters.