GENERATION OF VIRTUAL LOCAL OSCILLATOR INPUTS FOR USE IN DIRECT CONVERSION RADIO SYSTEMS

摘要

The invention provides a system and method of generating a number of inpu ts to the mixer elements in a direct conversion (homodyne) receiver configuration using Virtual Local Oscillator (VLO) techniques. These generated inputs meet the requirement that they must have a fixed and stable phase-relationship, as well as being correctly related in terms of their pow er spectra relative to the operating radio (RF), intermediate (IF), and baseban d frequencies of the system, and that when applied to the mixer elements they permit the mixer elements to create internally the effect of applying the Local Oscillator signal at a suitable frequency.