Ultra wideband doherty amplifier
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United States of America Patent
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Feb 21, 2017
Grant Date -
Oct 15, 2015
app pub date -
Mar 25, 2015
filing date -
Apr 15, 2014
priority date (Note) -
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Abstract
A Doherty amplifier for amplifying an input signal to an output signal, the Doherty amplifier comprising: a main amplifier for receiving a first signal and for amplifying the first signal to generate a first amplified signal; a first peak amplifier for receiving a second signal and for generating a second amplified signal, the first peak amplifier only operating when the second signal has reached a first threshold power, the first and second signal split from the input signal; and output circuitry to combine the first and second amplified signals to generate an output signal having an operating bandwidth, the output circuitry comprising inductors arranged in the format of a branch line coupler, the inductors coupled to the output parasitic capacitances of the main and peak amplifier.
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