| 摘要 |
A 90-degree phase delay power divider part PSPD is connected to an input side of a carrier amplifier Amp 1 and a peak amplifier Amp 2 , and a variable electric length power combiner VTL 2 is connected to an output side thereof. A control signal Sig is applied through a control terminal Ctrl of the variable electric length power combiner VTL 2 , and adjustment is performed in correspondence to a carrier frequency band of a carrier signal RFs so that an electric length of the variable electric length power combiner VTL 2 becomes nearly 90 degrees. As a result, an electric length of an output power combining circuit of a Doherty type amplifier can be made variable, and a power-added efficiency can be enhanced for a multi-band or broad band.
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