Robert D Pugh

US Patent:

47231084, Feb 2, 1988

Filed:

Jul 16, 1986

Appl. No.:

6/886835

Inventors:

Colin N. Murphy - San Mateo CA
Robert G. Pugh - Menlo Park CA

Assignee:

Cypress Semiconductor Corporation - San Jose CA

International Classification:

G05F 326

US Classification:

323315

Abstract:

A reference circuit for compensating for the natural response of MOS circuits to changes in temperature and manufacturing variances. The reference circuit comprises a voltage reference circuit that generates a stable current over variations of temperature and includes a current mirror circuit coupled to a first MOS transistor which is biased so that its change in threshold voltage due to temperature variations is compensated by its change in transconductance due to temperature variations, which voltage reference circuit produces a stable current through a second MOS transistor, which stable current is applied to a voltage generator circuit which modulates the gate bias voltage of a third MOS transistor such that the gate to source bias of the third MOS transistor is varied to compensate for variations in temperature.

US Patent:

51858657, Feb 9, 1993

Filed:

Aug 4, 1989

Appl. No.:

7/389759

Inventors:

Robert Pugh - Los Gatos CA

Assignee:

Apple Computer, Inc. - Cupertino CA

International Classification:

G06F 1332
G06F 1342

US Classification:

395275

Abstract:

Interface ciruitry for accomplishing a block transfer of information over a NuBus protocol bus having associated therewith a plurality of individual computer modules through the steps of testing to determine whether an addressed module is capable of accomplishing a NuBus protocol block transfer, conducting such a transfer if that module is capable of accomplishing a NuBus protocol block transfer, locking the bus if that module is not capable of accomplishing a NuBus protocol block transfer, conducting a series of individual data transfer operations during the period the bus is locked, terminating the individual operations, and unlocking the bus.