SiGe HBT power amplifier with distortion-controllable bias circuit and its application to 802.11g wireless LANs

This paper describes a SiGe HBT power amplifier with distortion-controllable bias circuits. MOSFETs employed in the bias circuits enable us to control the distortion of power amplifiers by adjusting the gate voltages. The power amplifier MMIC for 802.11lg wireless LANs fabricated using the technique exhibited excellent linearity and efficiency: a linear output power of 18.3 dBm and a power-added efficiency of 16% were achieved at an EVM of 3%, measured with 54 Mbps 64-QAM OFDM signals at 2.45 GHz.