Patent ID: 8451067
Filing Date: 2013-05-28
Classification: H03B,H03L,H03M

Abstract:
1. A variable modulus modulator for a fractional-N frequency synthesizer comprising: an integer division unit; a pulse-width modulation (PWM) generator; a ΣΔ noise-shaping unit; a first input for receiving a first programmable integer; and a second input for receiving a second programmable integer, wherein the integer division unit is configured to perform a translation from the first input and the second input into a first output and a second output, the PWM generator is configured to receive the second input and the second output, and generate a modulated pulse signal, and the ΣΔ noise-shaping unit is configured to receive the first output and the modulated pulse signal, and generate a sequence of average value of the first programmable integer over the second programmable integer.