Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-03-14
1981-01-13
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307306, 307352, 324102, 328151, H03K 5153, H03K 524
Patent
active
042451698
ABSTRACT:
A sampling circuit and method therefor including a first Josephson junction or producing a series of sampling pulses for activating a second Josephson junction that is receptive of both the analog current signal being sampled and a bias current. The first Josephson junction is continually triggered at a fixed time relative to the repetitive analog signal to provide a series of sampling pulses and before each sampling pulse the bias level to the second Josephson junction is changed until the sum of the current from the sampling pulse, from the analog signal, and from the bias source exceeds the critical current value of the second Josephson junction causing it to switch from one voltage state to another. The value of the bias current at the point of switching is proportional to the current in the analog signal.
In one embodiment, the bias current is increased in a step-like fashion for each sampling pulse from the first Josephson junction until the critical value of the second Josephson junction is reached. The resolution of the analog signal for this embodiment is 1/N if there are N samples.
In another embodiment where the analog signal is known to exist between two extremes, the bias current for the first sample is initially positioned at a mid-range value between the extremes. If, at the sample time, the second Josephson junction is switched, the bias current for the next sample is reduced by 1/2. If the second Josephson junction has not switched, the bias current is increased by 1/2 for the next sample. This process continues for N samples, the resulting resolution being 1/2.sup.N.
REFERENCES:
patent: 3764905 (1973-10-01), Zappe
patent: 3983419 (1976-09-01), Fang
Englert Alvin J.
Pawlikowski Eugene J.
The United States of America as represented by the Secretary of
Zazworsky John
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