Offset and phase correction for delta-sigma modulators

Details Offset and phase correction for delta-sigma modulators Offset and phase correction for delta-sigma modulators

1995-04-05

1996-10-01

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

375247, 375376, H03L 700, H03M 302

Patent

active

055616607

ABSTRACT:
The present invention discloses method and apparatus for offset and phase correction in multiplexed delta-sigma modulators. According to the invention, offsets and phases of input signals to multiplexed delta-sigma modulators are corrected by a simple and low cost method. The invention utilizes a novel switching technique during different sampling periods to eliminate the effect of DC offsets present in multiplexed input signals. The invention also uses a delay introduced by a FIFO or a shift register to individually correct for phase shifts present in individual multiplexed input signals. The invention accomplishes these objectives without introducing a significant quantization noise, and without requiring overlapping FIR filters.

REFERENCES:
patent: 4862485 (1989-08-01), Guinea et al.
patent: 4888790 (1989-12-01), Wong et al.
patent: 5457714 (1995-10-01), Engel et al.

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