Patent ID: 6828862
Filing Date: 2004-12-07
Classification: H03F

Abstract:
A radio-frequency (RF) power amplifier, comprising:an active device, which comprises: an input port, which is coupled to receive an RF input signal having a center frequency f0 and a single-sided bandwidth BW; and an output port, which is characterized by an output capacitance C1 and is coupled to output an amplified RF signal, responsive to the input signal, with a peak output power Pout; and a distortion suppression circuit, which is coupled between the output port and a ground, and comprises a transmission line having a characteristic impedance Z0 that is selected so as to substantially satisfy a condition that Z0&leq;f0Ï€&it;â€ƒ&it;BW&CenterDot;1Pout11.3+4&it;Ï€&it;â€ƒ&it;BW&CenterDot;â€ƒ&it;C1.