Hughes Electronics Corporation

Erik L Soderburg

Victor S Reinhardt

An apparatus for limiting intermediate frequency variation in a multiple conversion phase locked loop includes a reference oscillator and a voltage controlled oscillator (VCO). The reference oscillator generates a first reference frequency, while the VCO generates an output frequency. The output frequency is divided by a first VCO divider and mixed with the first reference frequency to generate a first intermediate frequency. A second VCO divider also divides the output frequency and mixes it with the first intermediate frequency to generate a second intermediate frequency, which is filtered and used to control the VCO. An algorithm processor generates the division constants of the first and second VCO dividers as a function of the reference frequency and the output frequency to limit intermediate frequency variation.

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Torrance, CA, United States of America

Erik L Soderburg