A MIXED BIAS-MODE POWER AMPLIFIER FOR WCDMA APPLICATIONS

作者：Lee Dong Ho^*; An Kyu Hwan; Lee Ockgoo; Kim Hyungwook; Lee Chang Ho; Laskar Joy

来源：Microwave and Optical Technology Letters, 2011, 53(11): 2547-2552.

DOI：10.1002/mop.26367

• adaptive bias
• CMOS power amplifiers
• efficiency enhancement
• power amplifier
• WCDMA

A wideband code-division multiple access (WCDMA) CMOS power amplifier with a mixed bias-mode scheme has been developed to meet high linearity and low-quiescent current requirements at the same time. The power stage of the two-stage power amplifier consists in three identical differential pairs that are selectively biased with a fixed bias mode or an adaptive bias mode. Each output power of three differential pairs is combined with an on-chip transformer to achieve output power requirement. The developed power amplifier shows 25.7% of power-stage drain efficiency at 27 dBm of output power with -33 dBc ACLR at 5 MHz offset in 1.95 GHz. The quiescent current of the mixed bias-mode power stage was 81 mA, whereas, it is 212 mA with the fixed bias mode.

• 出版日期2011-11