RF power transistor circuits

摘要

A radio frequency (RF) power transistor circuit includes a power transistor and a decoupling circuit. The power transistor has a control electrode coupled to an input terminal for receiving an RF input signal, a first current electrode for providing an RF output signal at an output terminal, and a second current electrode coupled to a voltage reference. The decoupling circuit includes a first inductive element, a first resistor, and a first capacitor coupled together in series between the control electrode of the power transistor and the voltage reference. The decoupling circuit is for dampening a resonance at a frequency lower than an RF frequency.

主权项

1. A radio frequency (RF) power transistor circuit comprising:
a first power transistor having a control electrode for receiving a first RF input signal, and a first current electrode for providing a first RF output signal; and a first decoupling circuit, comprising:
a first inductive element, a first resistor, and a first capacitor coupled together in series between the control electrode of the first power transistor and a voltage reference, wherein the first inductive element and the first capacitor form a first inductor/capacitor circuit, wherein the first resistor is configured to dampen a resonance of the first inductor/capacitor circuit, and wherein the first decoupling circuit provides a low impedance termination to ground for distortion products that develop due to envelope frequencies.