James N Goad

US Patent:

47409665, Apr 26, 1988

Filed:

Sep 30, 1986

Appl. No.:

6/913831

Inventors:

James R. Goad - Newark CA

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04J 304

US Classification:

370112

Abstract:

A plurality of differential analog input channels are multiplexed into a programmable gain amplifier providing four input ranges. The circuit is self-calibrating under microprocessor control with periodic measurements taken of internal channels for analog ground voltage, analog reference voltage and the voltage reference temperature in addition to the analog input signals. The output of the isolation amplifier is fed into a sample and hold circuit and, under the control of an analog input register into an analog to digital converter. An earth barrier separates a primary side which includes the input channels, optically isolated bidirectional MOSFET relays coupled to the input channels, a programmable, selectable gain multiplexer and the input to an isolation amplifier from a secondary side by means of opto isolators bridging the earth barrier. The secondary includes the sample and hold circuit, the power supply, the analog to digital converter, the analog control register, the voltage reference source and decoders.

US Patent:

59450738, Aug 31, 1999

Filed:

Sep 12, 1997

Appl. No.:

8/928696

Inventors:

Lee C. Ditzler - Diablo CA
James R. Goad - Newark CA

Assignee:

Novazone - Livermore CA

International Classification:

B01J 1908

US Classification:

42218619

Abstract:

Ozone generation cells using corona discharge to convert molecular oxygen to ozone are cooled by thermoelectric cooling devices clamped between the outer surface of the cell and a heat sink. The heat sink is preferably a finned structure permitting heat dissipation by air passing between the fins, avoiding the need for water cooling of the cell.