Eta Devices, Inc.

Ati International Srl

Digital Equipment Corporation

Ati Technologies Inc.

Sun Microsystems, Inc.

Pixtronix, Incorporated

Ela Devices, Inc.

John Edward DeRoo

David J Perreault

Krenar Komoni

Joel L Dawson

Mark A Briffa

Oguzhan Uyar

Andrew Evan Gruber

Milivoje M Aleksic

Robert C Frame

James C Yee

Roger W Barton

Stephen R Lewis

Jianguo Yao

Steven Morein

Paul Phillips

Bernardo Rub

Michael T Wright

Danny H M Cheng

Stephen English

Brian Ramelson

Steve Metzger

Hon Ming Cheng

Brian Favela

Ann Solli

Anne Solli

Samuel B Skraly

Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion (DPD) and pulse cancellation in switched-state RF power amplifier systems are described.

Linearization circuits and methods for multilevel power amplifier systems

A radio frequency (RF) power amplifier system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers.

RF amplifier having a transition shaping filter

A display apparatus includes an array of light modulators. Each light modulator has a first actuator configured to drive the light modulator into a first state and a second actuator configured to drive the light modulator into a second state. The display apparatus also includes a control matrix including, for each light modulator in the array, a single actuation voltage interconnect. The actuation voltage interconnect is configured to apply a first drive voltage to the first actuator of the light modulator and apply a second drive voltage to the second actuator of the light modulator. In addition, the actuation voltage interconnect is configured to control application of a data voltage to a latch circuit to control the application of the first and second drive voltages to the first and second actuators.

Circuits for controlling display apparatus

RF amplifier having discrete supply voltages

Circuits and methods for performing multilevel power amplification using multiple different supply voltages or states are disclosed. In some embodiments, power amplifiers are provided that switch between three or more supply voltages or states.

Method and apparatus for multilevel power amplification

A radio frequency (RF) transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers. In at least one implementation, amplitude adjustment of the RF input signals of the one or more power amplifiers may be used to provide transmit power control and/or power backoff for the RF transmitter.

Transmitter architecture and related methods

RF amplifier architecture and related techniques

A radio frequency (RF) power amplifier system or transmitter includes one or more power amplifiers and a controller that is configured to adjust amplitudes and phases of RF input signals of the one or more power amplifiers and supply voltages applied to the one or more power amplifiers. In embodiments where multiple power amplifiers are used, a combiner may be provided to combine outputs of the power amplifiers. In at least one implementation, amplitude adjustment of the RF input signals of the one or more power amplifiers may be used to provide transmit power control and/or power backoff.

In one general aspect, a stream-based memory circuit is disclosed that includes physical storage elements and at least a first physical access port. A stream-based access controller is operatively connected to the physical storage elements and to the access port. The controller includes function-specific hardware logic operative to access data as streams in the physical memory in response to stream-based access commands at the access port.

Stream based memory manager with function specific hardware logic for accessing data as a stream in memory

A method and apparatus for utilizing a data cache in a system with both 2D and 3D graphics applications. In a specific embodiment of the present invention, a mode signal is received by the video system indicating whether a 2D or 3D application is to be used. Depending on the mode signal, either as a unified cache capable of being accessed by two separate data access streams, or two independent caches, each accessed by one data access stream.

Method and apparatus for accessing graphics cache memory

A method and apparatus for compressing parameter values for pixels within a frame is accomplished by first grouping pixels in the display frame into a plurality of pixel blocks, where each pixel block includes a plurality of pixels. For at least one of the pixel blocks, the parameter values for the pixel block are translated into a column-wise differential slope representation that represents the parameter values as a plurality of reference points, a plurality of slopes, and a plurality of slope differentials. The column-wise differential slope representation is then transformed into a planar differential slope representation that reduces the representation of the plurality of reference points and the plurality of slopes to a single reference pixel value, two reference slopes, and a plurality of slope differentials. An output format representation of the planar differential slope representation is then generated, where encoding of the slope differentials allows the parameter values for the pixel block to be compressed. This compressed format representation of the parameter values can then be stored in and retrieved from memory.

Method and apparatus for compressing parameter values for pixels in a display frame

Growing community of inventors

Hopkinton, MA, United States of America

John Edward DeRoo