Low-power direct digital frequency synthesizer architecture

Details Low-power direct digital frequency synthesizer architecture Low-power direct digital frequency synthesizer architecture

H - Electricity

03

B

H03B 28/00 (2006.01) G06F 1/035 (2006.01)

Patent

CA 2159535

A direct digital frequency synthesizer for generating a digital. sine or cosine function waveform includes input means to receive digital input. Memory stores digital samples along portions of sine and cosine function waveforms. The memory outputs the digital samples in response to a first portion of the digital input. Control logic responsive to the input means controls the output of the digital samples from the memory to allow digital samples along a complete cycle of the sine or cosine function waveform to be output even though only portions of the sine and cosine function waveforms are stored in the memory. Linear interpolation means receives a second portion of the digital input and modifies digital samples output by the memory to generate intermediate digital samples between the digital samples stored in the memory to improve accuracy.

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