Intel Corporation

Rockwell Collins, Inc.

Edward J Anthony

David Steven Ripley

James Phillip Young

Timothy L Kean

David L Krett

Ted J Hoffman

In a portable radio transceiver, such as a mobile wireless telephone, conditions indicative of transmitter distortion (as represented by error vector magnitude (EVM)) are sensed, and transmitted RF power is adjusted in response, so as to reduce distortion and decrease EVM. The conditions can include high VSWR or a combination of high VSWR and low battery power.

Error vector magnitude control within a linear transmitter

A magnitude of radio frequency voltage and current, input into a load from a radio frequency power source, are measured at a single point along a transmission line. Phase difference between voltage and current is also measured. These measurements are used to compute VSWR and forward input power. The computed measurements may be compared against predetermined VSWR limits, and operation of the radio frequency power source can be adjusted to prevent damage to the detection apparatus or load.

Apparatus and method for radio frequency power and standing wave ratio measurement

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Marion, IA, United States of America

Edward J Anthony