High order Epsilon Delta noise shaping interpolator for direct digital frequency synthesis
A technology of digital frequency synthesis and noise shaping, applied in automatic control of power, electrical components, incremental modulation, etc., can solve the problems affecting the speed of accumulation of phase accumulator 20, increase of synthesizer hardware, etc.
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[0020] according to figure 1 , the output of an ideal direct digital frequency synthesizer can be expressed as:
[0021] A out = A sin ( 2 πWt 2 n T clk ) = A sin ( 2 πWi 2 n )
[0022] Where A is the full-scale output value of the digital-to-analog converter, and the time variable t=T clk i. The output here is an ideal sine wave, but there must be noise interference in the output wave signal for the following reasons.
[0023] 1. The synthesizer step size is f clk / 2 n . In order to obtain higher frequency res...
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