The Spectral Products Created by Nonlinear Intersymbol
Interference in NRZ Data
- J. O. Coleman
In two-level noise-shaped D/A conversion, a
delta-sigma modulator quantitizes a bandlimited
discrete-time signal into a binary drive for a
two-level D/A converter that then outputs a nominally
clean NRZ data waveform with the quantization-noise
spectrum shaped to be very low in the signal band.
Nonlinear intersymbol interference in the final
two-level conversion can, however, corrupt the signal
band with intermodulation noise. Here a nonlinear
model of that two-level conversion is used to derive
its output spectrum for test data that are either
periodic or random with i.i.d. bits, results that can
enable laboratory measurement of model parameters and
guide needed circuit improvements.
- DOWNLOADABLE PREPRINT:
PDF (237 Kbytes),
- Presented at the The 38th Annual Asilomar Conference on
Signals, Systems, and Computers, Pacific Grove CA, USA,
Oct. 30 - Nov. 2, 2005.
- DATE OF ENTRY: