Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-05-16
1989-08-22
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307475, 307264, 307462, 505858, 505861, H03K 19195, H03K 1792
Patent
active
048598798
ABSTRACT:
This is a superconducting digital logic amplifier for interfacing superconductor circuits with semiconductor circuits. It provides a gigahertz amplifier to convert low voltage superconducting logic signals to higher voltage signals, suitable for semiconductor signal processing circuits. It may, for example, provide a factor of ten voltage gain to raise the 2.5 mV Josephson logic signals of conventional metallic superconductor circuitry to 25 mV signals for input into inexpensive semiconductor amplifiers which, in turn, can power semiconductor logic circuitry. Generally, it utilizes a first series string of Josephson junctions in series with an input Josephson junction to provide a series combination which is then connected in parallel with a second string of higher critical current Josephson junctions. The input signal is introduced between the first series string and the input Josephson junction, and the output terminal is connected at the common connection opposite the input Josephson junction. A pulsed DC current source is also connected at the common connection with the output terminal. The current from Josephson junction logic circuitry is introduced through the input Josephson junction, exceeding its critical current and switching this Josephson junction to the resistive state, the combined input and current from the DC current source, then switch the Josephson junctions in the second series to the resistive state, and the DC current source finally switches Josephson junctions in the first string to the resistive state, giving an output voltage of the sum of all of the voltages across the Josephson junctions in the series strings. Thus, with nine Josephson junction in the first series string, plus the input Josephson junction in series with the first series string, and with ten Josephson junctions in the second series string, for example, the amplifier provides a factor of 10 in voltage between its input and output.
REFERENCES:
patent: Re31485 (1984-01-01), Faris
patent: 3365584 (1968-01-01), Bragg
patent: 4371796 (1983-01-01), Takada
patent: 4413196 (1983-11-01), Josephs et al.
patent: 4559459 (1985-12-01), Wang et al.
Bertelson David R.
Miller Stanley D.
Stoltz R. A.
Westinghouse Electric Corp.
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