Nvidia Corporation

Maxim Integrated Products, Inc.

Edward W Liu

Sean Jeffrey Treichler

Bruce R Intihar

A differential amplifier circuit that includes a negative resistor in parallel to synthesize a larger source resistance is disclosed. In one or more implementations, a differential amplifier circuit includes a first transistor and a second transistor. The first transistor is configured to receive a first differential input and the second transistor is configured to receive a second differential input. The differential amplifier circuit also includes a third transistor and a fourth transistor that form a pair of cross-coupled transistors coupled to the first transistor and the second transistor. The pair of cross-coupled transistors are configured to generate a negative impedance at an output node, and the negative impedance, combined with an impedance of the first transistor, is configured to generate a sufficient termination impedance for a transmission line electrically connected to the output node.

Source-series terminated differential line driver circuit

Method and interface for configuring a link is described. A transceiver has configuration registers. The configuration registers are read to determine capability of the transceiver. An application is selected, and the configuration registers of the transceiver are configured responsive to the application selected. A protocol having initialization, transmit and receive portions is described to facilitate configuration operations, such as reads and writes of configuration registers, for such a link.

Protocol and interface for source-synchronous digital link

Modification of transmission control parameters is prevented during data transmission in a wireless transmitter. A lockout unit is used to prevent modification of the transmission control parameters during data transmission and allow modification of the transmission control parameters when data is not being transmitted. When the wireless transmitter is included in a computing system a software driver for the wireless transmitter does not need to include a software lockout mechanism. Furthermore, the wireless transmitter including the lockout unit may be tested as a standalone device, facilitating regulatory agency certification as a modular transmitter.

Wireless transmitter control lockout

Apparatus for a baseband-media interface is described. More particularly, in an embodiment, a baseband processor, a medium access controller and a baseband-media interface are provided with a input/output controller as an integrated circuit. In another instance, a baseband processor, a medium access controller and a baseband-media interface are provided on a printed circuit board and coupled to an input/output controller via a bus. The printed circuit board may be a system board or a peripheral card.

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Milpitas, CA, United States of America

Edward W Liu