DOHERTY AMPLIFIER
A Doherty amplifier includes: a first main amplification element (5) to amplify a first signal; a second main amplification element (6) to amplify the first signal amplified by the first main amplification element (5) ; a first auxiliary amplification element (7) to amplify a second signal; a second...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A Doherty amplifier includes: a first main amplification element (5) to amplify a first signal; a second main amplification element (6) to amplify the first signal amplified by the first main amplification element (5) ; a first auxiliary amplification element (7) to amplify a second signal; a second auxiliary amplification element (8) to amplify the second signal amplified by the first auxiliary amplification element (7); a combination circuit (9) to combine the first signal amplified by the second main amplification element (6) and the second signal amplified by the second auxiliary amplification element (8); and a phase adjustment circuit (13) connected between the first auxiliary amplification element (7) and the second auxiliary amplification element (8). The Doherty amplifier is then configured in such a way that the phase adjustment circuit (13) adjusts either the phase of a return signal going to the first auxiliary amplification element (7) as a result of passage of the first signal amplified by the second main amplification element (6) through the second auxiliary amplification element (8) as the return signal, or the phase of the return signal going to the second auxiliary amplification element (8) as a result of reflection of the return signal by the first auxiliary amplification element (7), at a time of a backoff operation of the second auxiliary amplification element (8), in such a way that the sum of the phase of the return signal going to the first auxiliary amplification element (7) and the phase of the return signal going to the second auxiliary amplification element (8) is not equal to 0 degrees in the operating frequency band of the first signal. |
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