Glenn J Keller, Age 71904 Chickadee Ln, West Chester, PA 19382

6674247, Jan 6, 2004

Dec 20, 2001

10/032583

Carver A. Mead - Santa Clara CA
Glenn J. Keller - Santa Cruz CA

Foveon, Inc. - Santa Clara CA

H05B 3700

315241P, 315241 S, 315200 A

Photographic flashes use the major portion of available energy in modern cameras. A series of innovations within a photographic flash system improves the energy efficiency by a factor of 3, and thereby extends battery life. The flash system includes a precise flash-termination circuit, a high-efficiency charging circuit, a low-leakage coupled inductor, and a battery-saving charge-circuit drive. Flash termination is controlled by a majority-carrier switching device. This circuit allows termination of the flash current without the timing uncertainty or parasitic leakage associated with previous designs. Multiple flashes also can be produced by the circuit, which may be interfaced with through-the-lens flash controls. A flyback-converter charging circuit uses a coupled inductor that has an alternately layered winding pattern to lower leakage inductance drastically, and uses appropriately selected wire types to decrease skin-effect resistance losses. Because of the low leakage inductance, the charge circuit can make use of simple energy-efficient overshoot-damping circuitry.

6960757, Nov 1, 2005

Apr 16, 2003

10/418881

Richard B. Merrill - Woodside CA, US
Robert S. Hannebauer - Sunnyvale CA, US
Glenn J. Keller - West Chester PA, US
James Tornes - Menlo Park CA, US

Foveon, Inc. - Santa Clara CA

G01J003/50

250226, 2502081

Vertical-color-filter pixel sensors having simplified wiring and reduced transistor counts are disclosed. In an embodiment, a single line is used for reference voltage, pixel reset voltage, and column-output signals in a VCF pixel sensor. In another embodiment, row-reset signals and row-enable signals are sent across a line that is shared between adjacent rows in an array of VCF pixel sensors. The present invention also provides an optimized layout for a VCF pixel sensor with shared row-reset, row-enable, reference voltage and column-output lines as well as a VCF pixel sensor in which source-follower voltage, source-follower amplifier voltage and row-enable signals all share a common line. These combined line embodiments can be used with a single column-output line as well as two row-enable lines. The embodiments can also be implemented in a VCF pixel sensor without a row-enable transistor.

7834411, Nov 16, 2010

May 15, 2007

11/748928

Richard B. Merrill - Woodside CA, US
Shri Ramaswami - Gilbert AZ, US
Glenn J. Keller - West Chester PA, US

Foveon, Inc. - Santa Clara CA

H01L 31/00

257440, 257290, 257292, 257293, 257294, 257E31084, 257E3112, 257E31121

An active pixel sensor in a p-type semiconductor body includes an n-type common node formed below a pinning region. A plurality of n-type blue detectors more lightly doped than the common node are disposed below pinning regions and are spaced apart from the common node forming channels below blue color-select gates. A buried green photocollector is coupled to the surface through a first deep contact spaced apart from the common node forming a channel below a green color-select gate. A red photocollector buried deeper than the green photocollector is coupled to the surface through a second deep contact spaced apart from the common node forming a channel below a red color-select gate. A reset-transistor has a source disposed over and in contact with the common node. A source-follower transistor has gate coupled to the common node, a drain coupled to a power-supply node, and a source forming a pixel-sensor output.

8039916, Oct 18, 2011

Nov 11, 2010

12/944027

Richard B. Merrill - Woodside CA, US
Shri Ramaswami - Gilbert AZ, US
Glenn J. Keller - West Chester PA, US

Foveon, Inc. - Santa Clara CA

H01L 31/00

257440, 257290

An active pixel sensor in a p-type semiconductor body includes an n-type common node formed below a pinning region. A plurality of n-type blue detectors more lightly doped than the common node are disposed below pinning regions and are spaced apart from the common node forming channels below blue color-select gates. A buried green photocollector is coupled to the surface through a first deep contact spaced apart from the common node forming a channel below a green color-select gate. A red photocollector buried deeper than the green photocollector is coupled to the surface through a second deep contact spaced apart from the common node forming a channel below a red color-select gate. A reset-transistor has a source disposed over and in contact with the common node. A source-follower transistor has gate coupled to the common node, a drain coupled to a power-supply node, and a source forming a pixel-sensor output.

5418321, May 23, 1995

Dec 15, 1992

7/991059

Glenn J. Keller - Los Gatos CA
Timothy J. McDonald - West Chester PA
James Redfield - West Chester PA
Robert S. Schmid - West Chester PA

Commodore Electronics, Limited - Nassau

G10H 700

84606

An audio channel system provides an analog signal corresponding to a sound waveform in a computer system. The audio channel system includes a plurality of audio channels. Each audio channel contains a predetermined number of audio data samples for producing a particular sound waveform. A plurality of volume bits define a volume level of each audio data sample to be played. An audio processor processes the sound waveforms of each audio channel. The audio processor acts as a shared processing element which receives the audio data samples from each audio channel. The audio processor divides the audio data samples into a plurality of data such that the plurality of data for each audio data sample is pipelined through the audio processor in a serial manner. The plurality of data for each audio data sample for each audio channel is in various processing stages at any given time. The audio processor combines the data samples and volume bits to produce an audio output signal for each audio channel to produce a total audio output signal.

4829473, May 9, 1989

Jul 18, 1986

6/886614

Glenn Keller - Los Gatos CA
Jay G. Miner - Mtn. View CA

Commodore-Amiga, Inc. - Los Gatos CA

G06F 316
G10K 1500

364900

A peripheral control circuit for a computer system. Independent control and interface circuits are provided for left and right audio channels, for a communications port, for storage media, and for joysticks or paddles. Control logic is provided for direct memory access to system memory and for interrupts to the processor by each of the peripherals. Sound data corresponding to a sound waveform during a particular time period is fetched using DMA or interrupts. Registers store data for selecting the output rate of the sound data, the length of the sound waveform, and the volume of the sound waveform. Four audio channels and two separate audio ports are provide.

4780844, Oct 25, 1988

Jul 18, 1986

6/886615

Glenn Keller - Los Gatos CA

Commodore-Amiga, Inc. - Los Gatos CA

G06F 1500
G06F 300
H03D 324

364900

A digital phase locked loop circuit for reading input data transmitted from storage media. Counter and adder components establish the time of arrival of input data bits. Inspection windows are established having durations and start/stop times that can be adjusted by correction signals so that subsequent data bits will be received in the middle of the inspection windows. Correction signals to the counter and adder components compensate for variations in the phase and frequency of input data transmitted from storage media.

4931751, Jun 5, 1990

Jun 2, 1989

7/360333

Glenn J. Keller - Los Gatos CA
Javier A. Solis - Santa Clara CA

Epyx, Inc. - Redwood City CA

H03K 708
H03K 710

332108

An apparatus is provided which is responsive to a multiple bit sample of digital information for producing a pulse width modulated signal, the apparatus comprising: a first signal match detector, responsive to a first subset of the multiple bit sample, for producing a first signal that can transition between first and second logical states; a second signal match detector, responsive to a second subset of the multiple bit sample, for producing a second signal that can transition between the first and second logical states; and a voltage summing circuit for producing a first voltage that is substantially proportional to a magnitude of the first signal in one of the first logical state and the second logical state and for producing a second voltage that is substantially proportional to a magnitude of the second signal in one of the first logical state and the second logical state and for producing an output voltage that is substantially proportional to a sum of the first voltage and the second voltage.