Multi-channel Doherty amplifier, multi-antenna transmitter, and method for turning on the multi-channel Doherty amplifier

A method for turning on a multi-channel Doherty power amplifier, the multi-channel Doherty power amplifier comprises multiple channel specific peaking amplifiers and a common Doherty core, the common Doherty core comprises one common carrier amplifier and at least one common peaking amplifier, wherein the method comprising:

• turning on the common carrier amplifier until an input power level reaches a predetermined threshold;
• turning on the multiple channel specific peaking amplifiers in a proper sequence for the multiple channel specific peaking amplifiers until all the channel specific peaking amplifiers are on;
• and
• turning on the at least one common peaking amplifier in a proper sequence for the at least one common peaking amplifier until all the at least one common peaking amplifier are on.

A multi-antenna transmitter, comprising:

• a signal processor, configured to perform signal processing on base band input signals of multiple channels;
• and
• a multi-channel Doherty power amplifier comprising:
• multiple input ports and a same number of output ports corresponding to multiple channels,
• multiple channel specific peaking amplifiers corresponding to the multiple channels, and
• a common Doherty core shared by the multiple channel specific peaking amplifiers, wherein the common Doherty core comprises one common carrier amplifier and at least one common peaking amplifier;
• wherein, the multiple channel specific peaking amplifiers and the common Doherty core are configured to amplify identical multi-channel signal for multiple inputs and multiple outputs.