H - Electricity – 03 – K
Patent
H - Electricity
03
K
328/115, 328/135
H03K 19/195 (2006.01)
Patent
CA 1078466
AN ELECTRONICALLY ALTERABLE NON-LATCHING JOSEPHSON AND, OR, NAND, NOR LOGIC CIRCUIT Abstract of the Disclosure An electronically alterable logic circuit is disclosed which provides different logical outputs which are a function of con- trol signals applied to the circuit. More specifically, a non-latching Josephson junction circuit is provided which is capable of providing true and complementary outputs at a pair of output terminals when at least one pair of a plurality of pairs of fixed biases are applied to a plurality of serially arranged Josephson junction devices. The Josephson devices are arranged so that a true output can be obtained from an output circuit which shunts a pair of Josephson devices while the com- plement of the true output can be obtained at an output circuit which shunts an appropriately biased Josephson junction which is disposed in series with the above mentioned pair of Josephson junctions. The comple- mentary output is achieved by utilizing a portion of the output circuit, which shunts the pair of Josephson junctions as a control line for the single Josephson junction in series with the pair of Josephson junctions. The current through the control line portion, when present, opposes a bias current setting up a situation such that when current flows in the output representative of a true output, no current flows in the output repre- sentative of a complementary signal and vice versa. In addition to achieving true and complementary outputs which can be characterized as AND, NAND, OR and NOR outputs, it has been recognized that these same outputs can be attained at the complementary output by simply applying binary combinations of biases to the two bias lines associated with the logic circuit. In other words, if predetermined biases are applied, the input signals can, for example, be AND'ed while, for another set of biases for the same input signals, the input signals can be OR'd. Thus, for one period of time with a given set of biases, the circuit disclosed is capable of applying one logic function to the input signals while, in a second time period, the same circuit, by simply changing the biases, is capable of applying a different logic function to the same or different input signals. To the extent that a large number of such circuits is utilized in a data processor, the specific function of each circuit can be programmed from time period to time period so that the same circuitry can be configured in a different way and indeed appear as if an entirely different machine were available. The ability to electronically alter the logic function of a circuit has applications in the data secrecy and data scrambling areas.
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