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Variable Amplitude Regulated Ac Power for Josephson Logic

IP.com Disclosure Number: IPCOM000046119D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 29K

Publishing Venue

IBM

Related People

Arnett, PC: AUTHOR

Abstract

Equipping the second regulator with a source of heat compensates for critical current variations by varying the regulated power supply amplitude in a two-regulator scheme for minimizing chip-to-chip variation.

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Variable Amplitude Regulated Ac Power for Josephson Logic

Equipping the second regulator with a source of heat compensates for critical current variations by varying the regulated power supply amplitude in a two-regulator scheme for minimizing chip-to-chip variation.

Fig. l shows a double-regulator technique to vary the regulated power supply amplitude to compensate for the critical current variation. It has the advantage that the choice of power supply amplitude can be based on direct high frequency operation of the circuits, the dynamic operating window of the chip circuits can be established allowing a graded rating of acceptable chip performance, and the position of the window can be varied over the life of the product to compensate for possible aging effects.

The variable amplitude regulated power supply waveform is achieved by placing the regulator junctions which supply the logic circuits in thermal contact with planar resistors. The local rise in temperature of the regulator will be proportional to the power density in the resistor. The effect of increasing temperature on the regulator junction I-V curve is shown in Fig. 2. The reduction in gap voltage with increasing temperature is dramatically evident.

The heated regulator is the second regulator in a double-regulation scheme. The first regulator (n junctions) largely determines the duty cycle. The second regulator (m junctions), during the regulated portion of the cycle, has a current excursion over a limited portion of the step at the gap such that the regulation and disturbs create a variation less than some specified value, say, 6%, of the supply voltage for any operating supply voltage. In other words, the supply voltage is the median value around which the regulation and disturb variation occ...