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# Logic Circuitry

IP.com Disclosure Number: IPCOM000097619D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

IBM

## Related People

Mayeda, W: AUTHOR

## Abstract

An Esaki diode circuit for performing logical operations includes a pair of diodes E1 and E2 connected in series from a positive voltage supply V to ground. V(s) is varied between the values V1 and V2. V1 is a value where both diodes exist in a low voltage state and V2 is a value where one diode exists in its high voltage state and the other in its low voltage state. The basic V-I characteristic for the diodes is shown at the right. The first stable state exists between 0 and VA and the second stable state between V(B) and V(C). If E(1) and E(2) are chosen so that the values of I(max), or peak current, are different, then that diode having the lower I(max) is switched to the high voltage or second stable state when the supply voltage reaches the value V2.

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Logic Circuitry

An Esaki diode circuit for performing logical operations includes a pair of diodes E1 and E2 connected in series from a positive voltage supply V to ground. V(s) is varied between the values V1 and V2. V1 is a value where both diodes exist in a low voltage state and V2 is a value where one diode exists in its high voltage state and the other in its low voltage state. The basic V-I characteristic for the diodes is shown at the right. The first stable state exists between 0 and VA and the second stable state between V(B) and V(C). If E(1) and E(2) are chosen so that the values of I(max), or peak current, are different, then that diode having the lower I(max) is switched to the high voltage or second stable state when the supply voltage reaches the value V2.

The same effect, as is produced by having the I(max) of the diodes of different values, can be obtained by the use of a resistor R1 in parallel with E1. Ignoring the effect of the inputs X1, X2 and X3, in this case diode E2 switches to the high voltage state rather than El when V(s) rises to V2. Hence, the output voltage V0 is low since E1 remains in the low voltage state. However, if it is so arranged that logical inputs X1, X2 and X3 provide enough positive current flow, that is, current flow into point P just before V(s) rises to the value V2, then E1 attains its I(max) before E2 does. Hence, E1 switches to the high voltage state while E2 remains in the low voltage state. The output voltage V(...