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In Josephson technology, latches operating with applied AC power are required for storage of binary "1" and "0". These latches generally use an interferometer to switch currents into the storage loop.
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Negative Feedback Storage Loop for an AC Latch
In Josephson technology, latches operating with applied AC power are
required for storage of binary "1" and "0". These latches generally use an
interferometer to switch currents into the storage loop.
Fig. 1 shows the storage loop of an AC latch implemented in Josephson
technology, including an interferometer Q(1). The gate current is I(g), while the
control current to Q(1) is I(c). To store a circulating current representing a binary
1 in the storage loop, the gate current I(g) and control current I(c) must be
applied. At the end of the cycle, both these currents reset to 0, as shown in Fig. 2. As the gate current resets to zero, the circulating current in the loop builds up,
as indicated by the line connecting points B and C in the threshold curve denoted
by Fig. 3. If the floor of the threshold curve is lower, or if I(c) lags behind I(g),
Q(1) may switch and destroy the circulating current. To eliminate this problem, a
negative feedback arrangement is proposed, as shown in Fig. 4.
In Fig. 4, the output is taken from an asymmetric node such that when Q(1)
switches, the current I(L) is diverted into the load inductor and produces a
magnetic field LI(L) that opposes the applied field LI(C) due to the control current.
Thus, when current is transferred to the load inductor, the bias point shifts from B
to B', as shown in Fig. 5. When I(g) and I(c) are removed at the end of the cycle,
the locus of the threshold curve of...