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Tunnel Diode Bipolar Latch

IP.com Disclosure Number: IPCOM000095477D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Stapper, CH: AUTHOR

Abstract

This bipolar tunnel diode latch senses the polarity of the first portion of an input signal and provides a like polarity output signal.

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Tunnel Diode Bipolar Latch

This bipolar tunnel diode latch senses the polarity of the first portion of an input signal and provides a like polarity output signal.

The bipolar signal is applied between terminals 2 and 4. Tunnel diodes 5...8 are connected so as to have bistable characteristics, when a strobe voltage is applied to terminals 9 and 10. When such strobe potential is applied, diodes 5 and 7 assume low voltage states and diodes 6 and 8 their high voltage states. To insure that this switching action invariably occurs, diodes 6 and 8 can be tailored to have a faster switching speed than diodes 5 and 7. Alternatively, small capacitors can be placed in parallel around diodes 5 and 7.

If now, a bipolar signal 12 is applied between terminals 2 and 4, its leading positive portion causes the current through diode 6 to decrease to a point where it switches to its low voltage state. Because of the voltage divider action, diode 5 is caused to switch to its high voltage state. There is a resultant increase in the output potential appearing at terminal 11, as shown by waveform 14. The positive input has no effect on diodes 7 or 8 other than to reinforce their applied potentials. When the gating voltage is removed from terminals 9 and 10, all diodes revert back to low voltage states.

If an input signal such as 16 is now applied between terminals 2 and 4, the first appearing negative portion causes current to be drawn from ground through diodes 8 and 6 and 7 and 5, res...