Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-12-29
1981-06-16
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307277, 307306, H03K 502, H03K 338
Patent
active
042740150
ABSTRACT:
A self-resetting digital current amplifier which utilizes Josephson devices is disclosed. The basic circuit includes a pair of switchable Josephson devices connected to each other and with an output load. The first of these devices is switched by a combination of control current and gate current. The second device is switched by a combination of gate current and current applied from an inductance which is connected between the bottom of the first Josephson device and the top of the second Josephson device. The circuit is fed by a single DC source. In the steady state, current flows from the DC source through the first of the Josephson devices to the second of the Josephson devices via the interconnecting inductance and from then back to the DC source. A pair of resistances in series with the second of the Josephson devices cause current to flow in the inductance which, in the steady state, is essentially a short circuit path. In the dynamic state, a control signal on the first of the Josephson devices in the presence of the gate current causes that device to switch diverting the gate current into the second Josephson device. When the first Josephson device switches, the inductance experiences a high rate of change of current and, in effect, acts as a second current source feeding the second of the Josephson devices along with the diverted gate current. The combination of these currents exceeds the threshold of the second Josephson device causing it to switch instantaneously and deliver the combined current to a load circuit. Any number of additional inductances and current switched Josephson devices may precede the load circuit and amplification is achieved which is a function of the number of inductances acting as current sources. The circuit is self-resetting because it has only one external source. Resetting of the circuit can be independent of the value of load impedance and, as such, can feed current to a high load impedance without sacrificing the ability to be self-resetting. In another embodiment, a plurality of cascaded circuits may be connected in parallel to feed a single load circuit with an extremely high current pulse. The use of delayed triggering and current cancellation can also provide extremely narrow high current pulses. Because of the self-resetting feature, repetition rates in the picosecond range are also achievable.
REFERENCES:
patent: 3051906 (1962-08-01), Haynes
patent: 3758795 (1973-09-01), Anacker et al.
patent: 3849276 (1974-11-01), Greiner
patent: 3898569 (1975-08-01), Radcliffe
patent: 3913120 (1957-10-01), Lahiri
patent: 3978351 (1976-08-01), Zappe
S. M. Faris, "Current Amplifier with No Multiple Looping of Control Current Line", IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, pp. 2031-2032.
D. J. Herrell, "Josephson Multivibrator and Monostable Circuits", IBM Technical Disclosure Bulletin, vol. 17, No. 10, Mar. 1975, pp. 3082-3083.
International Business Machines - Corporation
Kilgannon, Jr. Thomas J.
Zazworsky John
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