Mary Elizabeth Hewitt

US Patent:

49788728, Dec 18, 1990

Filed:

Nov 20, 1989

Appl. No.:

7/437787

Inventors:

Arthur L. Morse - Hawthorne CA
Steve D. Gaalema - Encinitas CA
Ingrid M. Keimel - Fountain Valley CA
Mary J. Hewitt - Playa Del Rey CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

G06G 712
H03K 5159
H03K 500
G01J 500

US Classification:

307490

Abstract:

An amplifier circuit 12 for an infrared detector 10 in a detector array formed on a large-scale integrated structure. The amplifier circuit is fabricated along with the detector on the structure and includes an amplifier stage capacitively coupled 14 to the detector 10 and an output stage. A switching FET 16 is provided to selectively couple the detector to an external biasing source and another switching FET 24 is provided to reset the amplifier stage after an integration period. In one embodiment the output stage 28 includes a storage capacitor 30 selectively coupled to the amplifier stage by a switching FET 32. In another embodiment the output encoding stage 28 includes a two-gate FET 32 to control the voltage on a storage capacitor 30. The two-gate FET controls a voltage source which periodically pulses and drains the capacitor. One FET gate is connected to the amplifier stage output and the other is connected to a clocking signal.

US Patent:

45233268, Jun 11, 1985

Filed:

Jan 17, 1983

Appl. No.:

6/458607

Inventors:

Mary J. Hewitt - Playa del Rey CA
Arthur L. Morse - Manhattan Beach CA

Assignee:

Hughes Aircraft Company - El Segundo CA

International Classification:

G11C 1928
H01L 2978
H01L 2714
H01L 3100

US Classification:

377 58

Abstract:

Noise reduction and dynamic range expansion in a CCD imager is achieved by combining a narrow FAT zero metering gate with a reference column subtraction and CCD charge bailing.

US Patent:

47868317, Nov 22, 1988

Filed:

Dec 17, 1984

Appl. No.:

6/682112

Inventors:

Arthur L. Morse - Hawthorne CA
Steve D. Gaalema - Encinitas CA
Ingrid M. Keimel - Fountain Valley CA
Mary J. Hewitt - Playa Del Rey CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

G06G 712
H03K 342
H03K 5159
G01J 100

US Classification:

307490

Abstract:

An amplifier circuit 12 for an infrared detector 10 in a detector array formed on a large-scale integrated structure. The amplifier circuit is fabricated along with the detector on the structure and includes an amplifier stage capacitively coupled 14 to the detector 10 and an output stage. A switching FET 16 is provided to selectively couple the detector to an external biasing source and another switching FET 24 is provided to reset the amplifier stage after an integration period. In one embodiment the output stage 28 includes a storage capacitor 30 selectively coupled to the amplifier stage by a switching FET 32. In another embodiment the output encoding stage 28 includes a two-gate FET 32 to control the voltage on a storage capacitor 30. The two-gate FET controls a voltage source which periodically pulses and drains the capacitor. One FET gate is connected to the amplifier stage output and the other is connected to a clocking signal.

US Patent:

47330775, Mar 22, 1988

Filed:

Dec 20, 1984

Appl. No.:

6/683983

Inventors:

Steve D. Gaalema - Encinitas CA
Mary J. Hewitt - Playa Del Rey CA
Arthur L. Morse - Hawthorne CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

G01J 100
G01T 122

US Classification:

250338

Abstract:

A new technique, and output encoding circuits using that technique, are disclosed for interfacing between a semiconductor IR detector 23 and associated output electronics 24, 25, 26 which technique and circuits transfer a charge packet onto a sense capacitor 22 that previously stored a reset level signal. The resulting stepped signal change, or delta, in the voltage present on that capacitor 22 is employed as the output signal.