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Optimum Load for Esaki Diode Bistable Multivibrator

IP.com Disclosure Number: IPCOM000097515D
Original Publication Date: 1961-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Lanza, C: AUTHOR

Abstract

An optimum load for bistable switching of Esaki diodes is the maximum of the ratio: Difference of power into load for each stable state/ Time required to switch between states

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Optimum Load for Esaki Diode Bistable Multivibrator

An optimum load for bistable switching of Esaki diodes is the maximum of the ratio: Difference of power into load for each stable state/

Time required to switch between states

The numerator is a measure of the signal power and determines the number of stages that it can trigger. The denominator is directly related to computer speed so that by maximizing the above ratio, the product of fan-out and speed is maximized.

The circuit analyzed is shown in A and the equivalent circuit is shown in B. Since the load resistor is always large compared to the bulk resistance of the diode, the quantity Rs is omitted from the equivalent circuit. This calculation is made for the special case where the circuit inductance is zero.

For the purpose of this calculation, the diode characteristics are considered to be represented by four straight lines as shown in C. Various load lines are drawn through the current peak to intercept the characteristic in region III or IV. Two such lines are shown in C. Delta P is the difference between V/2//R(L) at points b and a, delta t is taken as the time for the voltage to increase from the initial value to 90 percent of its steady state value. The initial 10 percent is included since this time would introduce delay in logic circuits.

The equivalent circuit for region II is shown in C. This reduces to a simple RC network, except that the resistor has a negative value. The initial voltage E(o) on...