Jeffrey M Heath

US Patent:

6812465, Nov 2, 2004

Filed:

Feb 27, 2002

Appl. No.:

10/085226

Inventors:

William J. Parrish - Santa Barbara CA
Jeffrey L. Heath - Santa Barbara CA
Naseem Y. Aziz - Goleta CA
Joseph Kostrzewa - Solvang CA
George H. Poe - Goleta CA

Assignee:

Indigo Systems Corporation - Goleta CA

International Classification:

G01J 500

US Classification:

2503381, 2503361

Abstract:

Microbolometer circuitry and methods are disclosed to allow an individual microbolometer or groups of microbolometers, such as a microbolometer focal plane array, to operate over a wide temperature range. Temperature compensation is provided, such as through circuitry and/or calibration methods, to reduce non-uniform behavior over the desired operating temperatures. For example, the relative mismatch in the temperature coefficient of resistance of an active microbolometer and a reference microbolometer is compensated by employing a variable resistor in series with the active microbolometer. The variable resistor can be calibrated over the desired temperature range to minimize the affect of the relative mismatch. Various other circuit implementations, calibration methods, and processing of the microbolometer circuit output can be employed to provide further compensation.

US Patent:

7050107, May 23, 2006

Filed:

Jul 13, 2001

Appl. No.:

09/905006

Inventors:

Jeffrey D. Frank - Santa Barbara CA, US
Jeffrey Lynn Heath - Santa Barbara CA, US
Eugene Timothy Fitzgibbons - Goleta CA, US

Assignee:

Indigo Systems Corporation - Goleta CA

International Classification:

H04N 5/225

US Classification:

348375, 348372

Abstract:

An interface device connects a camcorder to a camera operating in the non-visible electromagnetic spectrum to form a portable unitary system. The interface device provides a mechanical connection between the camcorder and the camera. A video cable carries video image data from the camera to the camcorder. A control connection additionally may be provided between the camcorder and the camera through the interface device, to allow the camera to be controlled through controls on the camcorder itself. A power connection may be provided between the camcorder and the camera through the interface device, to allow the camera to draw power from the camcorder.

US Patent:

7230412, Jun 12, 2007

Filed:

Oct 19, 2005

Appl. No.:

11/252585

Inventors:

Jeffrey Lynn Heath - Santa Barbara CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

G01R 19/00
G01R 31/08

US Classification:

324 7611, 370241

Abstract:

Novel system and methodology for distinguishing a Network Interface Card (NIC) from a short circuit condition in a Power over Ethernet (PoE) system. A system for providing power to a powered device (PD) includes a PD probing circuit that generates a detection signal supplied to a device being probed and determines a response signal produced in response to the detection signal, and a control circuit that determines a detection value based on the response signal. The control circuit detects a short circuit if the detection value is in a first predetermined range, and detects a NIC if the detection value is in a second predetermined range outside of the first predetermined range.

US Patent:

7426374, Sep 16, 2008

Filed:

Nov 7, 2005

Appl. No.:

11/267261

Inventors:

David McLean Dwelley - Santa Barbara CA, US
Jeffrey Lynn Heath - Santa Barbara CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

H04B 1/04

US Classification:

4551271, 455405, 455501, 455 6711, 4555501, 370436, 370502

Abstract:

A system for supplying power to a load over a communication link has high-side current sensing circuitry for measuring a high-side current value, low-side current sensing circuitry for measuring a low-side current value, and control circuitry responsive to both the high-side current value and the low-side current value to detect a fault condition, detect information from the load, and/or transmit information to the load by creating a prescribed unbalance between the high-side current and the low-side current.

US Patent:

7466039, Dec 16, 2008

Filed:

Sep 18, 2006

Appl. No.:

11/522409

Inventors:

Jeffrey Lynn Heath - Santa Barbara CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

H01H 27/42

US Classification:

307104

Abstract:

System and methodology for driving an inductive load using a pass device for providing hot swap connection to the load. A current limit circuit prevents current supplied to the load from exceeding a current threshold. A foldback circuit controls the current limit circuit to reduce the current threshold when a voltage across the pass device is above a prescribed value. A filter circuit is coupled to the foldback circuit for reducing oscillations when the inductive load is connected to the pass device.

US Patent:

7538528, May 26, 2009

Filed:

Sep 13, 2006

Appl. No.:

11/520018

Inventors:

Jeffrey Lynn Heath - Santa Barbara CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

G05F 1/569

US Classification:

323274, 323275, 323277, 323279

Abstract:

System and methodology for supplying power to a load using a pass device for connecting the load. A current limit circuit prevents current supplied to the load from exceeding a current threshold. A foldback circuit modifies the current threshold in accordance with a prescribed condition. The foldback circuit is configured to vary the current threshold in accordance with an approximate safe operating area of the pass device.

US Patent:

7554783, Jun 30, 2009

Filed:

Oct 19, 2005

Appl. No.:

11/252565

Inventors:

Jeffrey Lynn Heath - Santa Barbara CA, US
Jacob Herbold - Santa Barbara CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

H02H 3/08
H02H 9/02
H02H 9/08
H02H 3/00

US Classification:

361 931, 361 937, 361 939, 361 78, 361 79

Abstract:

A novel system for providing power over the Ethernet includes a current limit circuit for preventing an output current from exceeding a current threshold set at a prescribed level, and a foldback circuit for reducing the current threshold when an output voltage is lower than a prescribed voltage value. The foldback circuit may be controlled to operate in a high-power mode to increase the current threshold above the prescribed level.

US Patent:

7613936, Nov 3, 2009

Filed:

Oct 19, 2005

Appl. No.:

11/252624

Inventors:

Jeffrey Lynn Heath - Santa Barbara CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

G06F 1/00

US Classification:

713300, 709220, 324607

Abstract:

Novel circuitry and methodology for detecting a Powered Device (PD) in a system for providing power to the PD. PD detection circuitry detects the PD in a first mode by providing detection current to probe the PD, and in a second mode by providing detection voltage to probe the PD. A control circuit determines that the PD is a valid device if the PD is detected both in the first mode and in the second mode.