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RC Coupled Tunnel Diode Shift Register

IP.com Disclosure Number: IPCOM000098217D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Gruodis, AJ: AUTHOR

Abstract

The circuit is a shift register utilizing tunnel diodes as the storage elements.

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RC Coupled Tunnel Diode Shift Register

The circuit is a shift register utilizing tunnel diodes as the storage elements.

Initially, all of the tunnel diodes D(T) are in their low voltage states and both A and B shift pulse sources are at their more positive levels. A positive pulse at the input sets the first tunnel diode to its high voltage state. The diode D(1) prevents the tunnel diode from returning to its low voltage state when the input pulse ends.

Application of a negative A pulse resets the first tunnel diode to its low voltage state, the capacitor C(1) tying the upper terminal of the tunnel diode to ground. The negative shift pulse is also transmitted through capacitor C(2) to the lower terminal of the succeeding tunnel diode. This places a voltage across the tunnel diode of the proper polarity to shift it to its high voltage state. In a similar manner, the B shift pulse resets the second stage tunnel diode and sets the third stage diode. As many stages as desired may be cascaded.

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