Browse Prior Art Database

Peak Detector

IP.com Disclosure Number: IPCOM000084023D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Wheeler, DR: AUTHOR

Abstract

A simple peak detector is substantially noise immune. In Fig. 1, if an analog input signal A is delayed time delta t, a delayed signal B occurs. The difference A-B between input signal A and the delayed signal B is either positive or negative, except at points where the signals cross. A digital output signal derived from the difference signal A-B will have a transition from positive to negative at each positive input signal A peak, and from negative to positive at each negative peak.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Peak Detector

A simple peak detector is substantially noise immune. In Fig. 1, if an analog input signal A is delayed time delta t, a delayed signal B occurs. The difference A-B between input signal A and the delayed signal B is either positive or negative, except at points where the signals cross. A digital output signal derived from the difference signal A-B will have a transition from positive to negative at each positive input signal A peak, and from negative to positive at each negative peak.

A noise perturbation X of input signal A will cause a matching perturbation of the delayed signal B reasonably retaining, within certain limits, the normal difference A-B. To the extent that this difference continues undisturbed, the noise X will have no effect on the output signal. Minor changes Y in the signal A- B will not affect the output either, unless the effect causes signal A-B to cross the zero axis.

In Fig. 2, analog input signal A is applied to a delay circuit delta t, and the delayed signal B is applied to a differential amplifier together with the original input signal A. The difference signal A-B is processed into a digital output by a limiting amplifier.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]