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This article relates generally to Josephson junction logic circuits and more specifically to a Josephson junction logic circuit having improved isolation.
English (United States)
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Isolator for Josephson Logic
This article relates generally to Josephson junction logic circuits and more
specifically to a Josephson junction logic circuit having improved isolation.
U.S. Patent 4,149,097 shows a waveform transition sensitive circuit wherein
an input circuit has a serially disposed Josephson junction which switches each
time the input current exceeds the threshold of the device. In so doing, the input
is isolated from the output.
The above figure shows a variation on the circuit of the patent. In the above
figure, logic circuit 1 includes an input circuit 2, an output circuit 3 and a switching
circuit 4. The switching circuit includes a pair of Josephson junction devices Q1,
Q2 connected in parallel, resistor R2 is connected between a terminal of each of
the devices Q11 Q2 and the other terminal of each of these devices is grounded.
Current sources Ib1, Ib2 are connected in series with devices Q1,Q2,
Output circuit 4 is connected in parallel with device Q1 and includes a load
resistor R(L). Input circuit 2 includes a loop circuit 5 disposed in parallel with
device Q1. Loop circuit 5 includes a serially disposed Josephson junction J, an
inductance L and a resistor R1. An input current Iin is connected to device J.
In operation, currents Ib1, Ib2 flow through devices Q1, Q2, respectively, to
ground. When a current Iin of appropriate polarity is applied to loop circuit 5,
current Iin is additive with current Ib1, causing device Q1 to...