Patent ID: 7680235
Filing Date: 2010-03-16
Classification: H03D,H03L

Abstract:
1. A digital voltage controlled oscillator (VCO), comprising: a phase data generator, configured to receive a frequency control input in synchronization with a reference clock signal, and to generate a phase data subject to change dependent on a value of said frequency control input; a synchronous clock signal generator, connected to said phase data generator, and configured to receive said phase data from said phase data generator and to generate a synchronous clock signal based on said phase data as a first output of the VCO; a delay quantity data generator, connected to said phase data generator and said synchronous clock signal generator, and configured i) to receive said frequency control input, said phase data, and said synchronous clock signal, and ii) to generate a delay quantity data as a second output of the VCO for delaying said synchronous clock signal based on said frequency control input and said phase data; and a register, wherein said phase data generator comprises: an adder configured to add, as an addition result, the value of said frequency control input with a previously updated phase data generated by said delay quantity data generator and stored by said register; and a surplus calculator, connected to said adder, and configured to receive the addition result from the adder and to output, as said phase data, a remainder of a division of the addition result by a predetermined value.