Texas Instruments Corporation

Andrea Bonelli

Francois Bauduin

Francois V E Bauduin

A serial data link () includes a transmitter () using a differential transmitter cell () to transmit data using differential signals and a receiver () using a differential receiver cell () to receive differential signals. When the transmitter () is in a power-down state, the differential signals from the differential transmitter cell () are set to an illegal state that is detected by the receiver cell (). Upon detecting the illegal state, unnecessary circuitry in the receiver () is shut off or placed in a low power state to conserve energy. When data transmission resumes, the receiver cell () automatically restores power to its circuitry and resumes receiving data.

Serial data link with automatic power down

A memory interface () for receiving memory signals individually synchronizes data signals to a delayed strobe signal in order to reduce the spread of the data signals prior to sampling. A delay is increased for an individual data signal if it transitions prior to the delayed strobe signal and the delay is decreased if the data signal transitions after the delayed strobe signal.

Method and apparatus for memory data deskewing

A high-impedance current source having an enhanced compliance voltage. The current source preferably has a means for generating a biasing current and a first current mirror stage having a first transistor M coupled to a second transistor M . A second current mirror stage having a third transistor M coupled to a fourth transistor M acts as a feedback circuit. A stabilization circuit having a fifth transistor M coupled to a sixth transistor M are also included. The stabilization circuit is coupled between the first and second current mirror stages and an output circuit having a seventh transistor M is connected to the stabilization circuit between the first and second current mirror stages. The current mirror circuit has a low compliance voltage, enhanced operating characteristics and enhanced dynamics which eliminate the need for OTAs.

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Villeneuve Loubet, France

Andrea Bonelli