Browse Prior Art Database

Peak Detecting Circuit

IP.com Disclosure Number: IPCOM000095616D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Wilson, MG: AUTHOR

Abstract

This peak detecting circuit determines the time at which a maximum level of voltage signal occurs. The arrangement avoids detecting leveling-out portions of the signal as a maximum level or 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 Detecting Circuit

This peak detecting circuit determines the time at which a maximum level of voltage signal occurs. The arrangement avoids detecting leveling-out portions of the signal as a maximum level or peak.

The circuit has an input terminal 10 connected by conductor 11 to base electrodes of transistors T1, T2 and T3. T1 and T2 are connected in a complementary emitter follower configuration.

When the voltage signal applied to terminal 10 is increasing, capacitor C is being charged through T1. Its voltage is less than the input signal voltage by the amount equal to the base-emitter voltage drop of T1. At this time, T2 is essentially cut off or non-conducting. When the input voltage signal applied to terminal 10 is decreasing, capacitor C is being discharged through T2. As C is being discharged, its voltage is more positive than the input signal voltage by the base-emitter voltage differential of T2. T1 is essentially cut off during this time. Neither the cutoff of T1, nor T2, is used to indicate the occurrence of a peak.

A third transistor T3 has its base connected to input 10. Its emitter connects to C via diode D and its collector connects to output 15. When the desired maximum level is reached, T3 is cut off and a sharp transition appears at output
15. Transistor T4 is an amplitude discriminator for noise rejection.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]