POWER AMPLIFIER WITH ANALOG PREDISTORTION
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United States of America
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Issued Date -
Mar 20, 2025
app pub date -
Feb 1, 2023
filing date -
Feb 1, 2023
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Abstract
A power amplifier with analog predistortion is disclosed. In one aspect, a signal in the transmission chain is sampled to determine if an amplitude distortion (expansion or compression) is present. Information about the sampled signal is provided to a control circuit, which uses an analog predistortion circuit to inject a correction signal into the transmission chain so as to offset or compensate for the amplitude distortion. In an exemplary aspect, the analog predistortion circuit adjusts a bias signal provided to the power amplifier. This detection and adjustment may be done in the front end of the transmission chain so as to avoid reliance on a baseband processor. Use of such analog predistortion helps maintain desired linear operation over the large bandwidths of emerging wireless communication standards.
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