A fractional-n divider using a delta-sigma modulator

Details A fractional-n divider using a delta-sigma modulator A fractional-n divider using a delta-sigma modulator

H - Electricity

03

M

H03M 3/02 (2006.01) H03L 7/197 (2006.01) H03M 7/36 (2006.01)

Patent

CA 2267496

A delta-sigma modulator having a dead-zone quantizer and an error shaping digital filter clocked by a signal which is periodic at the frequency of the reference. A dead-zone quantizer provides quantization of a high resolution digital word to a low resolution digital word with three or a higher odd number of possible output levels and with an output of zero for an input near the centre of the normal input range. The delta-sigma modulator is used in a fractional-N divider. The fractional-N divider is used in a fractional-N frequency synthesizer.

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