Powerwave Technologies, Inc.

The University of Bristol

Ross James Wilkinson

Andrew Bateman

Joseph P McGeehan

Richard D Posner

Mark Anthony Beach

Peter Blakeborough Kenington

Adrian Richard Mansell

James Douglas Marvill

Craig Scott Rackstraw

A control system for a linear feed-forward amplifier, using the ratio of measured spurious energy. Measuring receivers are coupled to two monitoring points to measure the spurious energy content in the error signal and at the main output of a feed-forward amplifier. The control system measures the ratio of these detected spurious, and uses this to optimize the settings of the second loop distortion cancellation. With the addition of an extra monitoring point, the same technique may also be used to control an adaptive predistorter prior to the main amplifier.

Spurious energy correlation for control of linear power amplifiers

Spurious ratio control circuit for use with feed-forward linear amplifiers

A Cartesian loop transmitter for transmitting baseband signals is disclosed. The disclosed Cartesian loop includes a forward path having a first input for receiving the baseband signals and a second input and a feedback path having an input from the forward path. The forward path including an upconverter to upconvert the input signals to a signal to be transmitted, an attenuator having selectable attenuation and a plurality of power amplifier stages. The feedback path including a pin diode attenuator having selectable attenuation and a downconverter to downconvert the input from the forward path. The feedback path provides an error signal indicative of the non-linearity of the forward path to the second input of the forward path.

Cartesian loop transmitter

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Bristol, United Kingdom

Ross James Wilkinson