- TITLE:
-
Circuit approaches to nonlinear-ISI mitigation
in noise-shaped bandpass D/A conversion
- AUTHORS:
-
Q. Mu,
J. O. Coleman,
D. P. Scholnik, and
Z. Popović
- ABSTRACT:
-
This paper focuses on the analysis of nonlinear
intersymbol interference (ISI) in RF bandpass
delta-sigma power digital-to-analog converters
(DACs). Digital RF transmitters based on direct
delta-sigma modulation have been proposed for
efficient linear multi-functional radios. We show that
a realistic one-bit DAC limits the linearity of such a
transmitter. The linearity is discussed in terms of
ISI, for both single-ended and differential DAC
circuits. Theoretical and experimental comparisons are
given with a three-tone delta-sigma test signal at a
1.5 GHz clock frequency with 60 MHz possible signal
bandwidth centered at 375 MHz. The
signal-to-noise-and-distortion (SINAD) is shown to be
improved for the differential case. It is also shown
that circuit design and bias voltages have a dramatic
effect on signal linearity.
- DOWNLOADABLE PDF PREPRINTS:
-
authors' two-column
manuscript, unofficial (1.3 Mbytes)
At IEEE Xplore: choose the
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page or the pdf (1.9 Mbytes)
- STATUS:
- published in the IEEE Transactions on Circuits and Systems
I: Regular Papers, July 2010, vol. 57, no. 7, pp. 1559-1572.
- DATE OF ENTRY:
-
August 2010.