Doherty amplifier

A Doherty amplifier comprising:

• a power divider configured to divide a high-frequency signal into a first input signal and a second input signal;
• a carrier amplifier including a main amplifying element configured to amplify power of the first input signal and including a parasitic element connected to an output source of the main amplifying element;
• a first phase compensation circuit configured to adjust a phase of an output signal of the carrier amplifier;
• a peaking amplifier including an auxiliary amplifying element configured to amplify power of the second input signal and including a parasitic element connected to an output source of the auxiliary amplifying element;
• a second phase compensation circuit having a negative electrical length, configured to adjust a phase of an output signal of the peaking amplifier;
• and
• a power combiner configured to combine an output of the first phase compensation circuit with an output of the second phase compensation circuit, wherein
• a signal transmission path starting from the output source of the main amplifying element to the power combiner has an electrical length of 180°×N−90° where N is a positive integer, and
• an electrical length of a signal transmission path starting from the output source of the auxiliary amplifying element to the power combiner has an electrical length of 180°×M−180° where M is a positive integer.