James S Beyer

US Patent:

50197215, May 28, 1991

Filed:

Aug 18, 1989

Appl. No.:

7/395965

Inventors:

Jon S. Martens - Madison WI
James B. Beyer - Madison WI
James E. Nordman - Madison WI
Gert K. G. Hohenwarter - Madison WI

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H03K 338
H03K 1792

US Classification:

307306

Abstract:

Active superconducting devices are formed of thin films of superconductor which include a main conduction channel which has an active weak link region. The weak link region is composed of an array of links of thin film superconductor spaced from one another by voids and selected in size and thickness such that magnetic flux can propagate across the weak link region when it is superconducting. Magnetic flux applied to the weak link region will propagate across the array of links causing localized loss of superconductivity in the links and changing the effective resistance across the links. The magnetic flux can be applied from a control line formed of a superconducting film deposited coplanar with the main conduction channel and weak link region on a substrate. The devices can be formed of any type to superconductor but are particularly well suited to the high temperature superconductors since the devices can be entirely formed from coplanar films with no overlying regions. The devices can be utilized for a variety of electrical components, including switching circuits, amplifiers, oscillators and modulators, and are well suited to microwave frequency applications.

US Patent:

43552897, Oct 19, 1982

Filed:

Jul 14, 1980

Appl. No.:

6/168502

Inventors:

James B. Beyer - Madison WI
James B. Summers - Spokane WA

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H03C 500
H04L 2720

US Classification:

332 17

Abstract:

A parallel type modulator is disclosed which utilizes a pair of bi-phase modulators (10), each of which are capable of independent phase and amplitude modulation. In each bi-phase modulator, a carrier frequency signal is split by a power splitter (20) into two signals 180. degree. apart in phase which are passed through directional couplers (30 and 31) and a pair of PIN diodes (35 and 36) to a summing junction (37). A bias source circuit (42) delivers biasing current to the coupled outputs of the directional couplers (30, 31) and through the PIN diodes (35, 36) to the summing junction (37); this current is returned to ground through a bias return circuit (44) which conducts the DC or low frequency biasing signal but allows the carrier frequency output signal to be passed through to the output of each bi-phase modulator. Reduction of the bias current to one diode below null levels at which the intermediate signals cancel will cause a carrier frequency signal to appear at the summing junction which will be in phase with the signal passed through the other diode. A continuous variation of the bias current through one of the diodes at a level below the null current level will result in amplitude modulation of the output signal at the summing junction.

US Patent:

51593467, Oct 27, 1992

Filed:

Jun 10, 1991

Appl. No.:

7/712931

Inventors:

Donald N. Bosch - Plymouth MN
James B. Beyer - Madison WI
Robert L. Cravens - Madison WI
Stanley E. Swirhun - Apple Valley MN

Assignee:

Alliant Techsystems Inc. - Edina MN

International Classification:

G01S 735
H03B 536

US Classification:

342175

Abstract:

A voltage controlled oscillator (VCO 10) is disclosed in a "ring" configuration using two FETs. Two isolated voltage control terminals provide increased tuning bandwidth. The design uses an active feedback topology resulting in greater device size for higher output power and circuit Q.

US Patent:

50461559, Sep 3, 1991

Filed:

Apr 6, 1990

Appl. No.:

7/505377

Inventors:

James B. Beyer - Madison WI
Joseph W. Byrne - Waukesha WI

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H03F 360

US Classification:

330 54

Abstract:

A highly directive, broadband, bidirectional distributed amplifier has a series of FETs connected between input and output lines which have their effective transconductances scaled in accordance with binomial coefficients along the distributed amplifier to maximize the directivity of the amplifier. Directivities on the order of -25 to -35 dB are obtained over as much as an octave in frequency. The effective binomial scaling may be achieved by insertion of appropriately sized capacitors in the gate lines of each of the FETs. The minimization bandwidth may be shifted to lower frequencies by incorporating passive impedances between the active devices in both the gate and drain lines. These impedances preferably comprise T-section inserts composed of serially connected lumped inductors and a capacitance from the junction between the inductors to ground. The distributed amplifier is bidirectional so that it can be excited from either port on the gate line with high directivity exhibited at each respective port on the drain line.

US Patent:

50122037, Apr 30, 1991

Filed:

Dec 27, 1989

Appl. No.:

7/457270

Inventors:

James B. Beyer - Madison WI
Steven Deibele - Albuquerque NM

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H03F 360

US Classification:

330286

Abstract:

A distributed amplifier has a plurality of amplifying sections which are connected between input and output lines comprising artificial transmission line sections. Input line attenuation compens This invention was made with U. S. Government support awarded by the Department of the Navy, Contract No. : N00014-87-C-0157. The U. S. Government has certain rights in this invention.

US Patent:

46759115, Jun 23, 1987

Filed:

May 21, 1986

Appl. No.:

6/865330

Inventors:

Vladimir Sokolov - Shakopee MN
James B. Beyer - Madison WI

Assignee:

Honeywell Inc. - Minneapolis MN

International Classification:

H04B 128

US Classification:

455325

Abstract:

A monolithic microwave integrated circuit broadband mixer in which the distributed amplifier concept is used to develop a broadband mixer circuit.

US Patent:

52296555, Jul 20, 1993

Filed:

Dec 26, 1991

Appl. No.:

7/816395

Inventors:

Jon S. Martens - Albuquerque NM
James B. Beyer - Madison WI
James E. Nordman - Madison WI
Gert K. G. Hohenwarter - Madison WI

Assignee:

Wisconsin Alumni Research Foundation - Madison WI

International Classification:

H03K 338
H03K 1792
H03K 508
H01L 3922

US Classification:

307306

Abstract:

A superconducting active device has dual control inputs and is constructed such that the output of the device is effectively a linear mix of the two input signals. The device is formed of a film of superconducting material on a substrate and has two main conduction channels, each of which includes a weak link region. A first control line extends adjacent to the weak link region in the first channel and a second control line extends adjacent to the weak link region in the second channel. The current flowing from the first channel flows through an internal control line which is also adjacent to the weak link region of the second channel. The weak link regions comprise small links of superconductor, separated by voids, through which the current flows in each channel. Current passed through the control lines causes magnetic flux vortices which propagate across the weak link regions and control the resistance of these regions. The output of the device taken across the input to the main channels and the output of the second main channel and the internal control line will constitute essentially a linear mix of the two input signals imposed on the two control lines.