Broadcom Corporation

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Ali Afsahi

Arya Behzad

Colin Fraser

Konrad W Kratochwil

Navid Lashkarian

Ali Sarfaraz

Dengwei Fu

A mixer for a transmitter includes a voltage converter to convert a baseband voltage to a baseband current. A mixer component mixes the baseband current with a local oscillator frequency. An output of the mixer component includes a radio frequency signal and a higher order radio frequency signal. A coupler sends the radio frequency signal and the higher order radio frequency signal to a differential output. A filter is integrated into the coupler to filter the higher order radio frequency signal before being output by the differential output.

Transmitter with reduced counter-intermodulation

A communications transceiver includes a shared multi-band mixer. Various configurations of the shared multi-band mixer include using suitable hardware/software in the form of circuitry, logic gates, and/or code functions to combine multi-band processing of RF signal conversion within a single shared mixer. Various configurations include separate or shared tuning and/or amplification of up-converted (mixed) multi-band communication bands. The communications transceiver processes each band separately within the single shared mixer.

Multi-band up-convertor mixer

Communication processing paths include distortions, such as DC offset in the baseband analog path, local oscillator feed-through distortion, and nonlinearity of gm's and power amplifiers which are calibrated for, separately or in combination. The cascaded DC offset and nonlinear distortions are modeled separately or in combination using even-and-odd order polynomials. A loopback path from the output of one or more distortion causing devices passes through a measurement and calculation module. The calculation module calculates predistortion polynomial's coefficients which will be stored in a look-up table to be used by a baseband predistorter to calibrate the path. The look-up table is stored locally or remotely.

Calibration of communication processing path

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La Jolla, CA, United States of America

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