Compensated .DELTA..SIGMA. controlled phase locked loop modulato

Details Compensated .DELTA..SIGMA. controlled phase locked loop modulato Compensated .DELTA..SIGMA. controlled phase locked loop modulato

1997-09-16

2000-01-04

Bocure, Tesfaldet

Pulse or digital communications

Transmitters

Antinoise or distortion

332107, 375376, H04L 2549

Patent

active

060118156

ABSTRACT:
A .DELTA..SIGMA. controlled phase locked loop modulation is used with limited oversampling factors while fulfilling the spectrum and/or phase noise requirements on the modulation in the phase locked loop. By filtering the quantization noise sufficiently then compensating for the distortion of the modulation at the input of the .DELTA..SIGMA. modulator, the required oversampling factor of the .DELTA..SIGMA. controlled phase locked loop modulators can be reduced without loss of performance. The distortion is mitigated by performing a compensation at the input to the .DELTA..SIGMA. modulator. The noise reduction obtained by lowering the bandwidth of the phase locked loop can then be traded to reduce the oversampling factor.

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