Browse Prior Art Database

Compensation for Power Supply Variation

IP.com Disclosure Number: IPCOM000094936D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Ferrier, HA: AUTHOR

Abstract

The circuitry is associated with an operational amplifier integrating circuit. Such circuitry compensates for variations in power supplies such that an output ramp function reaches the zero axis at the same point in time regardless of power supply variations.

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

Compensation for Power Supply Variation

The circuitry is associated with an operational amplifier integrating circuit. Such circuitry compensates for variations in power supplies such that an output ramp function reaches the zero axis at the same point in time regardless of power supply variations.

Operational amplifier 10, having capacitor feedback 11, integrates a rectangular wave input to provide a ramp output. Zener diode clipping circuits 12 and 13 on the input limits the positive and negative excursions of the input signal. Zener diode clipping circuits 14 and 15 limits the positive and negative excursions of the linear ramp output. The clipping circuits are connected to common voltage supplies 16 and 17 so that variations in power supplies are fully compensated.

For example, if the power supplies expand the voltage range by 10%, the slope of the ramp increases by 10%, but the ramp must cover 10% more voltage before reaching zero volts. This increase just balances out the 10% faster rate. Therefore, the ramp merely rotates about the point of intersection with the zero volt level on a voltage time graph.

1

Page 2 of 2

2

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