Behavior Research Methods & Instrumentation

, Volume 7, Issue 5, pp 471–473 | Cite as

Autoranging amplifier expands computer’s A/D sensitivity by two decades

  • C. F. Richmond
  • T. H. Nilsson
Computer Technology


This device accepts an analog signal from 0 to +14 V, automatically changes gain to condition the analog output to the limits of a ±1 V A/D converter, and transmits the gain mode as two digital bits. A computer with a 10-bit A/D converter and two sense lines uses this device to obtain the dynamic range of a 16-bit A/D converter. The relatively simple principle of the circuit may be of interest to expand the voltage sensitivity range of other analog devices for slowly changing signals.


Field Effect Transistor Operational Amplifier Reference Voltage Analog Device Gain Mode 
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  1. Graeme, J. G.Applications of operational amplifiers New York: McGraw-Hill, 1973, Pp. 99–100.Google Scholar
  2. Tobey, G. E., Graeme, J. G., &Huelsman, L. P.Operational amplifiers. New York: McGraw-Hill, 1971. Pp. 361–364.Google Scholar
  3. Todd, C. D.Junction field effect transistors. New York: Wiley, 1968. Pp. 160–166.Google Scholar

Copyright information

© Psychonomic Society, Inc. 1975

Authors and Affiliations

  • C. F. Richmond
    • 1
  • T. H. Nilsson
    • 1
  1. 1.University of AlbertaEdmontonCanada

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