Impedance matching circuit for radio-frequency amplifier

A radio-frequency module comprising:

• a packaging substrate configured to receive a plurality of components;
• a power amplifier implemented on the packaging substrate and configured to provide an amplified signal at an output;
• and
• an impedance matching circuit coupled to the output of the power amplifier and including a primary metal trace having a first end coupled to a voltage source for the power amplifier, and a second end coupled to the output of the power amplifier, the impedance matching circuit further including a secondary metal trace having a first end coupled to the second end of the primary metal trace, and a second end coupled to an output node, the impedance matching circuit further including a capacitance implemented between the first and second ends of the secondary metal trace, and configured to trap a harmonic associated with the amplified signal at the output of the power amplifier.

A wireless device comprising:

• a transceiver configured to generate a signal;
• a front-end module in communication with the transceiver and including a power amplifier configured to amplify the signal and provide an amplified signal at an output, the front-end module further including an impedance matching circuit coupled to the output of the power amplifier and including a primary metal trace having a first end coupled to a voltage source for the power amplifier, and a second end coupled to the output of the power amplifier, the impedance matching circuit further including a secondary metal trace having a first end coupled to the second end of the primary metal trace, and a second end coupled to an output node, the impedance matching circuit further including a capacitance implemented between the first and second ends of the secondary metal trace, and configured to trap a harmonic associated with the amplified signal at the output of the power amplifier;
• and
• an antenna in communication with the front-end module and configured to facilitate transmission of the amplified signal.