Power amplification circuit

A power amplification circuit comprising:

• a carrier amplifier and a peak amplifier included in a Doherty amplifier circuit;
• a first transformer comprising a primary winding connected to an output of the carrier amplifier;
• a second transformer comprising a primary winding connected to an output of the peak amplifier;
• a signal line connecting a first end of a secondary winding of the first transformer and a first end of a secondary winding of the second transformer to one another;
• a first capacitor;
• a second capacitor connected to the primary winding of the first transformer in parallel;
• and
• a third capacitor connected to the primary winding of the second transformer in parallel,
• wherein a first end of the first capacitor is connected to the signal line,
• wherein a second end of the first capacitor is connected to a reference potential, and
• wherein
• 0
• .
• 5
• ×
• 2
• Z
• M
• ⁢
• ω
• 0
• <
• C
• T
• <
• 1.5
• ×
• 2
• Z
• M
• ⁢
• ω
• 0
• (
• 1
• )
• where CT is a sum total of capacitance values of the first capacitor and the signal line, ω0 is an angular frequency, and ZM is a load impedance