Digital locked loop

摘要

A digital locked loop uses feedback to maintain an output digital signal in a specific digital relationship with a reference digital signal. The digital locked loop can lock an input digital signal according to a reference digital signal by using a digital counter, a resister and an arithmetic logic circuit instead of a phase locked loop and a frequency locked loop in motor drive integrated circuit for permanent magnetic brushless DC multi-phase motor drive applications. The circuit is designed not to use a voltage-controlled oscillator VCO and can be extended to broader applications such as digital data communications, digital image processing, and in the multi-media industry.