Cart (Loading....) | Create Account
Close category search window

A High-Speed Direct-Coupled Magnetic Memory Sense Amplifier Employing Tunnel-Diode Discriminators

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Kaufman, B.A. ; Electronics Division, The National Cash Register Company, Hawthorne, Calif. ; Hammond, J.S.

Because of a multiplicity of conflicting requirements, sense amplifier design is probably the most difficult circuit problem in a large, high-speed digital computer memory. The requirements include absence of pattern sensitivity, controllable input impedance, a wide band pass, stable gain, high common mode rejection, the ability to handle bipolar signals, stable reference levels, a fast comparator, low threshold level, and, one hopes, low cost. This paper discusses a new circuit which fulfills these requirements with simplicity. Intended for large size (> 1000 words) random access core and thin-film memories, it is capable of handling, for example, a 50-mv ``1'' with approximately 50-nsec delay for transmission and comparison. Common mode signals of as high as 10 volts do not affect discriminator performance. Two key features of the circuit are the use of a dc-coupled, ``long-tail pair'' preamplifier and a pair of tunnel diodes as the discrimination elements. The dc-coupled differential preamplifier provides high common mode rejection, stable gain, is pattern insensitive, and has the ability to handle bipolar signals. The tunnel diode provides a superior discriminator, since it is fast, and has a low-level threshold which is controllable and stable with temperature variations. Thus, requirements on the magnitude and stability of the preamplifier gain are less severe. Design equations are derived and a complete dc worst-case analysis is performed. Variations in the circuit for several specific applications and experimentally determined performance data are described. The generalized problem of a tunnel-diode discriminator used with a preamplifier is treated in Appendix II.

Published in:

Electronic Computers, IEEE Transactions on  (Volume:EC-12 ,  Issue: 3 )

Date of Publication:

June 1963

Need Help?

IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.