JAMES R DAVIS
Engineers in Boca Raton, FL

4607339, Aug 19, 1986

Jun 27, 1983

6/508440

James W. Davis - Boca Raton FL

International Business Machines Corporation - Armonk NY

H03K 19094, H03K 19173

364491

A master slice designed for storage in sub-stock and for use in producing very large scale integrated circuits in an automated placement and wiring environment is described that is made from a semiconductor electronic quality wafer and the like, the wafer having a "brickwall" set of active elements such as bipolar transistors together with associated passive elements arranged in a master slice image. The master slice is personalized using optimization techniques including among other steps, the steps of modeling, developing and validating primitive logic diagrams, determining element placement by a Monte Carlo simulated annealing method, selecting hierarchical wiring by a maze runner algorithm and further validation.

4615010, Sep 30, 1986

Jun 27, 1983

6/508393

James W. Davis - Boca Raton FL
Frank D. Jones - Wallkill NY

International Business Machines Corporation - Armonk NY

H03K 19094, H03K 19173

364491

A cascode logic design methodology for producing cascode current switch products utilizing Field Effect transistors wherein the field Effect transistors as voltage mode devices serve as current mode devices.

4535467, Aug 13, 1985

Nov 30, 1982

6/445601

James W. Davis - Boca Raton FL
Joel C. Leininger - Boca Raton FL
Carlos Munoz-Bustamante - Highland Beach FL
Gordon J. Robbins - Wappingers Falls NY

International Business Machines Corporation - Armonk NY

G11C 1900

377 81

A Level Sensitive Scan Design (LSSD) Shift Register Latch pair implemented in current switch logic is disclosed. The arrangement is characterized by the logic used to control the L1 and L2 latches being implemented in Differential Cascode Current Switch logic and the L1/L2 latches being coupled to only one current source. A "merged" L1/L2 latch arrangement employing only one current source is provided for an LSSD testing environment.

4608649, Aug 26, 1986

Jun 27, 1983

6/508451

James W. Davis - Boca Raton FL
Victor S. Moore - Gainesville FL
Nandor G. Thoma - Boca Raton FL

International Business Machines Corporation - Armonk NY

H03K 19094, H03K 19173

364491

A topological physical circuit design is utilized for the support of a Differential Cascode Voltage Switch circuit/logic technology in an Automated Placement-Wiring environment. This physical entity takes the form of a "brickwall" set of transistors in a Master Slice image which may be stored and later personalized.

4518874, May 21, 1985

Jan 20, 1984

6/572322

James W. Davis - Boca Raton FL
Frank D. Jones - Wallkill NY

International Business Machines Corporation - Armonk NY

H03K 19086, H03K 19092, H03K 19177, H01L 2710

307467

A bipolar transistor integrated circuit PLA is disclosed. The array includes a first and second mutually isolated epitaxial regions in a semiconductor substrate. A plurality of common collector bipolar transistors are formed in the first epitaxial region with selected ones of the plurality having their emitters connected in common to a first current source. A second plurality of common collector bipolar transistors in the second epitaxial region have the emitters of selected ones of the second plurality connected in common to the first epitaxial region. The bases of the corresponding pairs of transistors from the first and second epitaxial region are connected to an input signal source. The second epitaxial region is connected to an output node. In this manner, a cascode connected PLA is formed which eliminates the need for surplus current sources required in the prior art.