Browse Prior Art Database

Low Power Off Chip Driver for Current Switch Logic

IP.com Disclosure Number: IPCOM000085034D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Varadarajan, HD: AUTHOR

Abstract

The use of emitter-follower circuits in current switch logic, or emitter-coupled logic (ECL), is commonplace. However, the use of emitter-followers requires a relatively higher supply voltage. When current switch logic employs two volts or less, a collector driver may be advantageously employed.

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

Low Power Off Chip Driver for Current Switch Logic

The use of emitter-follower circuits in current switch logic, or emitter-coupled logic (ECL), is commonplace. However, the use of emitter-followers requires a relatively higher supply voltage.

When current switch logic employs two volts or less, a collector driver may be advantageously employed.

Depicted in the drawing is an emitter-coupled logic circuit employing a collector driver. The collector driver circuit is superior to this emitter-follower circuit in charging external capacitances. The collector driver output swing is limited by the clamping Schottky barrier diode SBD.

The supply voltage Vcc may have a minimum magnitude of 1.7 volts. The collector driver interfaces with standard current switch circuits.

1

Page 2 of 2

2

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