RF power transistor circuits

A radio frequency (RF) power transistor circuit comprising:

• a RF output terminal;
• a first node;
• a ground terminal;
• a power transistor having a control electrode for receiving a RF input signal, and a current electrode for providing a RF output signal, wherein the current electrode is coupled to the RF output terminal and to the first node;
• a first inductance with a first end coupled to the current electrode, and a second end coupled to the first node;
• a first capacitor with a first electrode coupled to the first node, and a second electrode coupled to the ground terminal;
• a first decoupling circuit coupled in parallel with the first capacitor between the first node and the ground terminal, wherein the first decoupling circuit includes a first resistor coupled in series with components of a first resonant circuit having a resonance that is lower than a RF frequency, wherein the components of the first resonant circuit comprise a second inductance and a second capacitor coupled in series between the first node and the ground terminal;
• and
• a third inductance coupled in series with the first resistor, the second inductance, and the second capacitor between the first node and the ground terminal.

A radio frequency (RF) power transistor circuit comprising:

• a RF input terminal;
• a ground terminal;
• a power transistor having a control electrode for receiving a RF input signal, and a current electrode for providing a RF output signal, wherein the control electrode is coupled to the RF input terminal;
• a first node between the RF input terminal and the control electrode;
• and
• a first decoupling circuit coupled between the first node and the ground terminal, wherein the first decoupling circuit includes a first resistor and a first inductance coupled in series with components of a first resonant circuit having a resonance that is lower than a RF frequency, wherein the components of the first resonant circuit comprise a second inductance and a first capacitor coupled in series between the first node and the ground terminal.