Motorola Corporation

David E Bockleman

Jui-Kuo Juan

A direct digital synthesizer ( ) includes a first accumulator ( ) that acts as the frequency accumulator in order to generate the desired average frequency. A second accumulator ( ) acts to generate a phase correction at each overflow, with the input into the phase correction accumulator ( ) being a function of the input frequency. The clock signal of the phase correction accumulator ( ) is the overflow signal ( ) of the frequency accumulator ( ). With this configuration, the frequency accumulator ( ) generates the timing, and the phase correction accumulator ( ) generates the interpolation value. The use of the two accumulators ( ) as described, eliminates the need to use a multiplier in the design which is a high current consumption device.

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Weston, FL, United States of America

David E Bockleman