Vector Delta-Sigma Modulation with
Integral Shaping of Hardware-Mismatch Errors
- Dan P. Scholnik
J. O. Coleman
- A common architecture here unifies ordinary scalar
delta-sigma modulators, vector I/O delta-sigma
modulators (including parallel banks of scalar ones),
mismatch-shaping DACs, delta-sigma modulators
incorporating mismatch-shaping DACs in the
conventional way, and something new: scalar or vector
delta-sigma modulators incorporating spectral shaping
of hardware mismatches as a natural and integral part
of the modulator structure. The common architecture
resembles a conventional delta-sigma loop but using
vector signals and a vector quantizer to operate in a
space of higher dimension than the input/output, which
are inserted/extracted from the loop along a subspace.
The expansion of dimension provides the redundancy
that permits the spectral shaping of hardware errors.
This common view of these systems suggests that the
multidimensional structure of the quantizer is key.
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- Presented at the
IEEE 2000 International Symposium on Circuits and Systems
(ISCAS 2000), Geneva, Switzerland, May 2000.