| 摘要 |
<p>An RF power amplifier including a carrier amplifier, and at least one peaking amplifier, a power dividing means coupled between an input of the power amplifier and inputs of said carrier amplifier and said one peaking amplifier, the output of said carrier amplifier being coupled through an impedance inversion means to a power amplifier output, and the output of said one peaking amplifier being coupled to said carrier amplifier output, and wherein said one peaking amplifier is configured to switch on with increase in input power, said power dividing means including a coupler having four ports including an input port, wherein said carrier amplifier is coupled to one of said ports serving as a first outlet port, and said one peaking amplifier is coupled to another of said ports serving as a second outlet port, and including impedance means coupled to said second outlet port, so that, power is partly passed to said one peaking amplifier coupled to the second outlet port, and is partly reflected at said impedance means back into the second outlet port, reappearing at said first outlet port, to which is coupled the carrier amplifier.</p> |
