Analysis and experimental verification of digital substrate noise generation for epi-type substrates

Substrate coupling in mixed-signal IC's can cause important performance degradation of the analog circuits. Accurate simulation is therefore needed to investigate the generation, propagation, and impact of substrate noise. Recent studies were limited to the time-domain behavior of generated sub...

Full description

Saved in:
Bibliographic Details
Published in:IEEE journal of solid-state circuits 2000-07, Vol.35 (7), p.1002-1008
Main Authors: van Heijningen, M., Compiet, J., Wambacq, P., Donnay, S., Engels, M.G.E., Bolsens, I.
Format: Article
Language:English
Subjects:
Amplifiers
Analog circuits
Analog integrated circuits
Circuit noise
Circuit simulation
Coupling circuits
Degradation
Digital circuits
Electric potential
Frequency
Frequency domains
Joining
Noise
Noise generation
Noise generators
Noise measurement
Spectra
Studies
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Substrate coupling in mixed-signal IC's can cause important performance degradation of the analog circuits. Accurate simulation is therefore needed to investigate the generation, propagation, and impact of substrate noise. Recent studies were limited to the time-domain behavior of generated substrate noise and to noise injection from a single noise source. This paper focuses on substrate noise generation by digital circuits and on the spectral content of this noise. To simulate the noise generation, a SPICE substrate model for heavily doped epi-type substrates has been used. The accuracy of this model has been verified with measurements of substrate noise, using a wide-band, continuous-time substrate noise sensor, which allows accurate measurement of the spectral content of substrate noise. The substrate noise generation of digital circuits is analyzed, both in the time and frequency domain, and the influence of the different substrate noise coupling mechanisms is demonstrated. It is shown that substrate noise voltages up to 20 mV are generated and that, in the frequency band up to 1 GHz, noise peaks are generated at multiples of the clock and repetition frequency. These noise signals will strongly deteriorate the behavior of small signal analog amplifiers, as used in integrated front-ends.
ISSN:0018-9200
1558-173X
DOI:10.1109/4.848209