Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-12-31
1976-09-28
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307235C, 307235W, 307306, 340347AD, 357 5, H03K 338, G11C 2702, G08C 900
Patent
active
039834190
ABSTRACT:
An analog waveform transducing circuit is disclosed which includes a pair of superconductive circuits connected in parallel between a pair of terminals. One of these circuits includes a Josephson tunnelling device and the other includes inductance (which may be distributed) which is greater than the inductance of the Josephson device. An analog signal is applied to one of said terminals. Means are provided for switching said Josephson device between normal and superconductive states to thereby trap one or more flux quanta. An output means is coupled to one of the two circuits.
In one embodiment the means for switching the Josephson device responds to the analog signal level only, that is the control current is fixed (or zero). In this embodiment a number of pulses may be produced which can be related to the signal level, so that the circuit is an analog to digital converter.
In another embodiment the means for switching said Josephson device includes a control means which normally results in said Josephson device being in a resistive state so that substantially all of said analog signal flows in said second circuit. When the means for switching switches the Josephson device to the superconductive state the second circuit will pass a portion of the analog signal equal to the analog signal flowing therein prior to the switching of the Josephson device. That portion of the analog signal reflecting variations in the analog signal subsequent to switching will flow in the first circuit. This condition will persist for so long as the Josephson device remains in the superconductive state. Substantially all the analog signal will again flow in the second circuit after the Josephson device is again switched to the normal state by the means for switching. This embodiment performs a sample and hold function in that the analog signal level at the time of switching is maintained in the second circuit regardless of variations (within proper limits) of the analog signal level. The current flowing in the second circuit may then be measured by any utilization means to measure the analog signal level at the time of switching.
REFERENCES:
patent: 3573662 (1971-04-01), Fulton
patent: 3879715 (1975-04-01), Zappe
patent: 3891864 (1975-06-01), Gueret
International Business Machines (IBM)
Zazworsky John
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