| 摘要 |
<p>A feedforward amplifier comprises a main-amplifier distortion detector (13) made up of: a main-amplifier path (11) containing a main amplifier (23), a first linear path (12); a main-amplifier power divider (31) for branching an input signal to said main-amplifier path (11) and said first linear path (12), and a power combiner/divider (32) for combining the outputs from said main-amplifier path and said first linear path (12) and for outputting the sum component and the difference component of said combined outputs as a main-amplifier main signal component and a main-amplifier distortion component, respectively; and a main-amplifier distortion canceller (16) made up of: a second linear path (14) supplied with said main signal component, a main-amplifier distortion injection path (15) containing auxiliary amplifying means (27, 28, 29), and a main-amplifier power combiner (33) for combining the output of said second linear path (14) with the output of said main-amplifier distortion injection path (15). The main amplifier (23) has a plurality of amplification characteristics.</p> |
