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A scheme for comparing amplitudes and phases in an AC power distribution system (such as that used to power Josephson latching logic circuits) is described.
English (United States)
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Monitoring System for AC Power Distribution
A scheme for comparing amplitudes and phases in an AC power distribution
system (such as that used to power Josephson latching logic circuits) is
Assume that there are two currents i(1)(t) [amplitude i(1) and
phase Phi(1)] and i(2)(t) [amplitude i(2) and phase Phi (2)] in the
AC power distribution system that one would like to measure and
compare. A small fraction of each can be diverted through control
lines (aa') of superconducting interferometers, as shown. An
externally generated current is applied through a second control line
(bb') over each device J1 and J2. First, the drive current I(t) is
adjusted to have an amplitude I and a phase Theta (1) such that the
current through bb' of J1 nulls out the effect of f x i(t) in aa'
of that device. This condition is recognized as existing when the
threshold curve of J1 (measured in a standard low frequency way) is
in no way modulated at the power supply frequency (i.e., no lateral
shrinking). Next I(t) is readjusted to I and Theta(2) such that the
current through bb' of J2 nulls out the effect of f x i (t) in
aa' that device. Then,
i(1) over i(2) = I(1) over I(2) (1)
Phi(1) - Phi(2) = Theta(1) - Theta(2) (2).
In addition, the actual magnitudes i and i are determined to within the
accuracy to which the amplitudes of the applied currents in the control lines (bb')
and the various mutual inductances are known.
A low frequency control current I(c)(t) for the thre...