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An OR gate which is capable of driving two parallel fan-outs is disclosed. The parallel connection alleviates the resonance problems of OR gates formed by series connection of multiple interferometers.
English (United States)
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Parallel Connected, Current Injection Or Gate For Josephson Technology
An OR gate which is capable of driving two parallel fan-outs is disclosed.
The parallel connection alleviates the resonance problems of OR gates formed
by series connection of multiple interferometers.
Fig. 1 shows the OR gate. When either of the inputs A and B is applied to
Josephson interferometers J1 and J2, respectively. the corresponding
interferometer switches to the voltage state and transfers its gate current I(ga) or
I(gb) to the adjacent unswitched interferometer. The total gate current through
the unswitched interferometer now exceeds I(mo) of that device and switches it
to the voltage state, delivering output current to the load RL. The necessary
conditions for successful operation of the OR gate of Fig. 1 are:
Under these conditions, we find that DeltaI(g)/I(g) = .20 is allowed for Delta
I(mo)/I(mo) = .15. The margins get worse when parameter variations between
the two interferometers are included. Also, the circuit of Fig. 1 cannot readily be
extended to three interferometers in parallel.
An improved parallel-connected OR gate is shown in Fig. 2. This circuit takes
advantage of the amplification obtained by the asymmetric injection of current
into an interferometer. In this way, only about a third of the original current is
required to switch an adjacent interferometer. For DeltaI(mo) /I(mo) = .15, the
proposed OR gate allows a +35% variation in the gate currents. The high gain
also allows the use of three or more interferometers in parallel if more inputs are
needed. The two input OR gate of Fig. 2 can also be used for four inputs by
using two control lines on each interfe...