Article

A low propagation delay dispersion comparator for a level-crossing AD converter

Analog Integrated Circuits and Signal Processing (impact factor: 0.59). 04/2012; 62(1):51-61. DOI:10.1007/s10470-009-9328-4 pp.51-61

ABSTRACT This paper presents the design of a continuous time voltage comparator with low propagation delay dispersion. The comparator
is intended to be used as a building block for a level-crossing AD converter: a type of AD converter where the sampling moments
are triggered when an input signal crosses predetermined threshold levels. This type of system sets very high demands on the
time measurement and the comparator to achieve the desired performance. The comparator design is based on several techniques
to minimize the comparator propagation delay dispersion. The comparator has been implemented in a 0.35μm BiCMOS process.
Measured results show good agreement with simulations. The slew rate related propagation delay dispersion is measured to 90ps
for an input frequency range from 3to 10MHz and amplitudes from 200mV to 1.65V. The comparator static power consumption
is 9mW.

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Keywords

0.35μm BiCMOS process
 
AD converter
 
amplitudes
 
building block
 
comparator propagation delay dispersion
 
continuous time voltage comparator
 
desired performance
 
good agreement
 
input frequency range
 
input signal
 
level-crossing AD converter
 
low propagation delay dispersion
 
paper presents
 
predetermined threshold levels
 
propagation delay dispersion
 
system sets
 

Kirill Kozmin