Patent ID: 6310653
Filing Date: 2001-10-30
Classification: H03L,H04N

Abstract:
A digital synthesizer comprising:a) a digital oscillator clocked by a sampling clock for generating a periodic digital signal:b) a frequency and phase comparator coupled to the digital oscillator for comparing a frequency and a phase of the periodic digital signal to another frequency and another phase of a periodic reference signal, that is asynchronous with respect to the sampling clock for the periodic digital signal wherein the periodic digital signal has multi bit values at a sampling rate of the sampling clock and wherein the multi bit values represent the frequency and the phase of the periodic digital signal, to produce frequency and phase comparison values; andc) an arithmetic unit having a first input coupled to the digital oscillator for receiving the multi bit values and a second input coupled to the frequency and phase comparator for receiving the frequency and phase comparison values and adjusting the multi bit values by the frequency and phase comparison values to produce an adjusted periodic digital signal synchronized to the periodic reference signal.