A novel bias circuit and MMIC power amplifier implementation for W-CDMA mobile handsets

摘要

A novel bias circuit providing a stable quiescent current for temperature and regulated voltage variations is proposed and implemented for a W-CDMA MMIC power amplifier. The power amplifier with the proposed bias circuit has a quiescent current variation of only 6% for the -30/spl deg/C to 90/spl deg/C temperature range, and 8.5% for the 2.9V to 3.1V regulated voltage range, and the variation of the power gain at the 28dBm output power is less than /spl plusmn/0.8 (0.05) dB for /spl plusmn/0.1V of regulated voltage (/spl plusmn/60/spl deg/C of temperature) variation.