Dual steered frequency synthesizer

摘要

A frequency synthesizer 100 comprising a charge pump 102 , a loop filter 104 , a loop divider 106 , and an active and dual port VCO 110 . An integrator 108 low pass filters a steering voltage to provide a low frequency path while the steering voltage provides a high frequency path. Both steering paths are connected to dual port VCO 110 . The dual port VCO 110 is a single frequency generator which is controlled by two control signals. The dual port VCO 110 , effectively provides the equivalent of a low frequency path 114 and a high frequency noise compensation path 112 , both paths effectively merging 116 by superposition.