A low-voltage wide-input CMOS comparator for sensor application using back-gate technique

Biosens Bioelectron. 2004 Jul 30;20(1):53-9. doi: 10.1016/j.bios.2003.10.013.

Abstract

In this paper, two new analog CMOS comparators (Type-I and Type-II) with low-voltage and wide-input capabilities are proposed. The comparator receives two analog inputs and puts out one digital state to identify the larger (or the smaller) of the input variables, which represents an useful operation in data conversion and sensory signal processing. Without using special fabrication technologies, the supply voltage of the circuit is reduced to 1 V. Due to the utilization of CMOS back-gate technique, the input range of the comparators is greatly improved. The comparators are composed of bulk-driven stage and dynamic latch. By using a CMOS n-well technology, the results of HSPICE simulations indicate that the response time of Type-I circuit is 1 micros under 10 mV identified resolution. Type-II comparator achieves 5 mV identified resolution. The input dynamic ranges of the comparators are approximately rail-to-rail.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • Analog-Digital Conversion*
  • Biosensing Techniques / instrumentation*
  • Biosensing Techniques / methods
  • Computer-Aided Design
  • Equipment Design
  • Equipment Failure Analysis*
  • Miniaturization
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Signal Processing, Computer-Assisted / instrumentation*
  • Transducers*
  • Transistors, Electronic*