Phase noise shaping using sigma delta modulation in a timing...

Details Phase noise shaping using sigma delta modulation in a timing... Phase noise shaping using sigma delta modulation in a timing...

2010-04-05

2011-10-04

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Pulse code modulation

Differential

C375S355000, C341S143000

Reexamination Certificate

active

08031783

ABSTRACT:
A method and apparatus for converting a high precision digital word into a high precision analog value is disclosed. A sigma delta modulator applies a digital input signal to a dither signal to generate a combined signal for sampling. A digital-to-analog converter quantizes the combined signal. An analog filter provides a cutoff at a bandwidth of interest to remove out of band quantization noise and signals. An I transfer function and a Q transfer function can be coupled between the sigma delta modulator and the digital-to-analog converter for mapping of the combined signal. The apparatus can also include a phase interpolator for receiving the output signal and outputting a clock recovery phase.

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