| 摘要 |
An amplifier is disclosed for providing processing of a variable RF signal, the amplifier comprising a first parallel gain stage and a plurality of second parallel gain stages electrically disposed between an input fixed impedance matching circuit and an output fixed impedance matching circuit. Wherein in operation each of the first parallel gain stage and plurality of second parallel gain stages are for processing the variable RF signal according to at least a characteristic of the RF power or frequency range. Each of the plurality of second parallel gain stages comprising a tunable impedance matching circuit such that when the second parallel gain stage is in operation the tunable impedance matching circuit providing a transformation of impedance to match between the second amplifier and output fixed matching circuit within the frequency range, and other than providing a match within the frequency range when not in operation.
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