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公开(公告)号：CA1162255A
公开(公告)日：1984-02-14
申请号：CA370487
申请日：1981-02-10
Applicant: IBM
Inventor： FARIS SADEG M
IPC: G11C11/44 , H03K19/177 , H03K19/195
Abstract: PROGRAMMABLE LOGIC ARRAY SYSTEM INCORPORATING JOSEPHSON DEVICES A Programmable Logic Array (PLA) system which utilizes Josephson devices and the noninverting capabilities of these devices is disclosed. The disclosed PLA system includes a personalized Read Only Memory (ROM) which is adapted to store the applied input signals as well as the output signals which are a logic function of the input signals. As soon as outputs from the ROM are available, an interface circuit which may be timed or untimed, inverting or noninverting provides output signals which can be utilized to drive other logic circuits or to act as inputs to another personalized Read Only Memory (ROM). The latter provides another logic function of the inputs at its outputs. Again, the outputs may be used directly or applied to another interface circuit which itself may provide inverted or noninverted outputs. Like the first mentioned ROM, the second mentioned ROM is capable of storing its inputs and the resulting outputs which are some logic function of the inputs as a result of the ROM personalization The ROM's involved utilize memory cells which are programmable Josephson junction devices operating in a liquid helium environment. The programmable logic array system is disclosed in a full adder embodiment which id dc powered. A similar hybrid embodiment using both ac and dc power is also shown. The resulting system using high density ROM's provides high speed logic using relatively standard loop circuits which minimize the effect of the presence of resonances of known random logic circuits.
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公开(公告)号：CA1148268A
公开(公告)日：1983-06-14
申请号：CA371083
申请日：1981-02-17
Applicant: IBM
Inventor： FARIS SADEG M
Abstract: YO980-026 SUPERCONDUCTING SWITCH AND AMPLIFIED DEVICE An amplifying or switching superconductive device is described whose current-voltage characteristic is drastically altered by heavy injection of excess energetic quasi-particles. In this device, the superconducting bandgap of a superconducting layer is greatly altered by overinjection of energetic quasi-particles so that the bandgap changes greatly with respect to its thermal equilibrium value, and in most cases is made to vanish. In a preferred embodiment, a three electrode device is fabricated where at least one of the electrodes is a superconductor. Tunnel barriers are located between the electrodes. A first tunnel junction is used to heavily inject energetic quasi-particles into the superconducting electrode to change its superconducting bandgap drastically. In turn, this greatly modifies the current-voltage characteristics of the second tunnel junction. This device can be used to provide logic circuits, or as an amplifier, and has an output sufficiently large that it can drive other similar devices.
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