Leon E Riebman

US Patent:

51666472, Nov 24, 1992

Filed:

Jan 27, 1992

Appl. No.:

7/825680

Inventors:

Leon Riebman - Rydal PA

Assignee:

AEL Defense Corp. - Lansdale PA

International Classification:

H03B 508
H03B 518

US Classification:

33107S

Abstract:

A low-noise oscillator has a resonant circuit for generating a signal at a desired frequency. A linear amplifier and a limiter are electrically connected to the resonant circuit at first, second and third locations. A buffer amplifier is electrically connected to the resonant circuit at a fourth location and applies the signal generated by the resonant circuit to a load. The first, second, third and fourth locations are selected to minimize the impedance from those locations to ground at 1/f frequencies.

US Patent:

51186608, Jun 2, 1992

Filed:

Feb 20, 1991

Appl. No.:

7/658285

Inventors:

Leon Riebman - Rydal PA

Assignee:

American Electronic Laboratories, Inc. - Lansdale PA

International Classification:

H03B 500
H03B 518
H01B 1200
H01L 3912

US Classification:

505 1

Abstract:

A low-noise cryogenic oscillator has a resonant circuit formed of superconducting material for generating a signal at a desired frequency. A linear amplifier and a limiter are electrically connected to the resonant circuit at first, second and third locations. A buffer amplifier is electrically connected to the resonant circuit at a fourth location and applies the signal generated by the resonant circuit to a load. The first, second, third and fourth locations are selected to minimize the impedance from those locations to ground at 1/f frequencies. The resonant circuit, the linear amplifier, the limiter and the buffer amplifier are all maintained at a temperature below the critical temperature of the superconducting material.

US Patent:

52806499, Jan 18, 1994

Filed:

Jun 18, 1992

Appl. No.:

7/900967

Inventors:

Leon Riebman - Rydal PA

Assignee:

AEL Defence Corp. - Lansdale PA

International Classification:

H04B 126
H03K 338

US Classification:

455326

Abstract:

A superconducting non-linear device includes a superconducting conductor, a current source associated with the conductor for applying to the conductor a bias current, and a control device associated with the current source for selectably controlling the magnitude of the bias current. The non-linear device according to the invention may be used in a number of circuit configurations, including a balanced mixer.

US Patent:

52587630, Nov 2, 1993

Filed:

Jun 18, 1992

Appl. No.:

7/900970

Inventors:

Leon Riebman - Rydal PA

Assignee:

AEL Defense Corp. - Lansdale PA

International Classification:

H04B 700

US Classification:

342350

Abstract:

A superconducting non-linear device comprising a superconducting conductor, a current source associated with the conductor for applying to the conductor a bias current, and a control device associated with the current source for selectably controlling the magnitude of the bias current. The non-linear device according to the invention may be used in a number of circuit configurations, including current limiting, switching, mixing and detecting circuits.

US Patent:

52276694, Jul 13, 1993

Filed:

Jul 24, 1991

Appl. No.:

7/735132

Inventors:

Leon Riebman - Rydal PA

Assignee:

American Electronic Laboratories, Inc. - Lansdale PA

International Classification:

H03K 1792
H03K 338

US Classification:

307245

Abstract:

A superconducting non-linear device comprising a superconducting conductor, a current source associated with the conductor for applying to the conductor a bias current, and a control device associated with the current source for selectably controlling the magnitude of the bias current. The non-linear device according to the invention may be used in a number of circuit configurations, including current limiting, switching, mixing and detecting circuits.

US Patent:

52647358, Nov 23, 1993

Filed:

Mar 19, 1991

Appl. No.:

7/671589

Inventors:

Leon Riebman - Rydal PA

Assignee:

AEL Defense Corp. - Lansdale PA

International Classification:

H03K 1792
H03D 900

US Classification:

307245

Abstract:

A superconducting non-linear device comprising a superconducting conductor, a current source associated with the conductor for applying to the conductor a bias current, and a control device associated with the current source for selectably varying the bias current between a first value below the critical current for the conductor means and a second value above the critical current. The non-linear device is a switching device comprising a switching element in the form of a superconducting film, a terminal for inputting a signal to the switching element, a terminal for outputting a signal from the switching element, and a circuit for applying a DC bias current to the switching element and for causing the DC bias current to vary between a first value below the critical current for the superconducting film and a second value above the critical current. The non-linear device is a square-law detector device comprising a thin-film superconductor, a terminal for coupling an RF signal to be detected to an input zone of the superconductor, a circuit for applying a DC bias current to the superconductor, the bias current being of a value to constrain the superconductor to operate in the quadratic portion of its resistance-current operating characteristic, and a circuit for obtaining a detected output signal from an output zone of the superconductor.

US Patent:

52911578, Mar 1, 1994

Filed:

Nov 20, 1992

Appl. No.:

7/980939

Inventors:

Leon Riebman - Rydal PA

Assignee:

AEL Defense Corp. - Lansdale PA

International Classification:

H01P 502

US Classification:

333 33

Abstract:

Electronic circuit node structures which minimize parasitic capacitance in linear path and angular circuit topographies for high frequency circuits are described. The electronic circuit comprises at least two signal conductor elements and an active or passive circuit element on a substrate. The conductor elements are arranged to define a gap between their ends. The circuit element bridges the gap. In one embodiment, the longitudinal axes of the conductor elements are laterally offset and generally parallel. The conductors are arranged to form the gap between adjacent edges on the ends of the conductors. The circuit element is arranged to bridge the gap. The other conductor edges near the gap are arranged at angles which increase the distance between them. In another embodiment, the conductor elements form an angle with the gap at the apex. The circuit element bridges the gap between the conductor edges nearest the apex.

US Patent:

52310787, Jul 27, 1993

Filed:

Sep 5, 1991

Appl. No.:

7/755264

Inventors:

Leon Riebman - Rydal PA
Eitan Gertel - Lansdale PA

Assignee:

AEL Defense Corp. - Lansdale PA

International Classification:

H03H 701
H01F 508

US Classification:

505 1

Abstract:

A thin-film superconducting LC network comprising a dielectric substrate having first and second oppositely disposed surfaces, a first thin-film superconducting conductor on one of the surfaces defining an inductor, second and third thin-film superconducting conductors on said first and second surfaces, respectively, said second and third conductors opposing each other and having at least a portion of the dielectric substrate therebetween to form a capacitor, and thin-film superconducting conductor for interconnecting the inductor and capacitor to form a desired LC network. In one embodiment, the substrate between the second and third conductors have a thickness less than the thickness of the substrate between the first conductor and it oppositely disposed surface. In another embodiment, the inductor is defined by a plurality of closely spaced adjacent turns and a channel is disposed within the substrate between the adjacent turns.