Texas Instruments Corporation

Avaya Ecs Ltd.

Benjamin James Kerr

Andrew J Pickering

Andrew D Stewart

The present invention provides an improvement of a 4-quadrant clock phase interpolator design to allow independent rotation of the output clocks in steps of 90&#xb0;. This feature is useful in clock/data recovery where the 90&#xb0; 'jumps' can be used as a coarse control to re-align the data capture clock to achieve any desired data word alignment and/or receive bus clock alignment. The phase interpolator has a switching circuit comprising a single level of switches; a set of four transistor loads; and a set of four current sources operable to be switched by the switching circuit through to any of the set of four transistor loads.

Phase interpolator with independent quadrant rotation

A method and circuit for performing channel equalization in a high speed transmission system comprising a transmitter and receiver. An application specific digital signal processor, ASDSP, performs channel equalization and compensation on digital data received from an analogue-to digital converter of the receiver. The ASDSP is operable to execute an application specific set of op-codes needed for performing channel equalization and compensation. An ASDSP register is coupled between the ASDSP and a system CPU in a feedback loop for performing channel equalization at the receiver. The ASDSP stores equalizer parameters and bit error rate measurements used by the ASDSP for performing channel equalization and compensation. An ASDSP program storage memory, coupled to and accessible by the ASDSP, stores an ASDSP micro-sequence program for controlling the processing steps for channel equalization and dataflow through the ASDSP.

Channel equalization using application specific digital signal processing in high-speed digital transmission systems

There is disclosed a telephony apparatus comprising a base station and a handset, one of the base station and the handset being connected to a telephony system via an IEEE 802.11 interface, the base station and the handset each further being provided with a Bluetooth interface, speech data and/or control data being transmitted between the base station and the handset on the Bluetooth interface.

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Wootton Fields, United Kingdom

Benjamin James Kerr