Continuous-time Analog Circuit For Computing Time Delays Between Signals

Author

Chiang Jung Pu
John G. Harris, Missouri University of Science and TechnologyFollow

Abstract

We describe an analog VLSI circuit that computes the time delay between an arbitrary input signal and its delayed version. Versions of this circuit will be used as the basic computational elements for human auditory localization models in both the horizontal and vertical directions. Since the circuit uses subthreshold CMOS circuitry, chip measurements show that delays ranging over five orders of magnitude can be recovered. The circuit delays the first input signal by two distinct time-constants and correlates each with the second input signal. The correlation values at the two points are then integrated and used to compute a finite-difference derivative that dynamically adjusts the time constants until an optimal delay is found. This paper describes the first continuous-time circuit for computing delays between arbitrary signals.

Recommended Citation

C. J. Pu and J. G. Harris, "Continuous-time Analog Circuit For Computing Time Delays Between Signals," Proceedings IEEE International Symposium on Circuits and Systems, vol. 3, pp. 357 - 360, Institute of Electrical and Electronics Engineers, Jan 1996.

Department(s)

Electrical and Computer Engineering

International Standard Serial Number (ISSN)

0271-4310

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Institute of Electrical and Electronics Engineers, All rights reserved.

Publication Date

01 Jan 1996