A New Wideband Distributed Doherty Amplifier for WCDMA Repeater Applications

作者：Lee Yong Sub^*; Lee Mun Woo; Kam Sang Ho; Jeong Yoon Ha

来源：IEEE Microwave and Wireless Components Letters, 2009, 19(10): 668-670.

DOI：10.1109/LMWC.2009.2029755

• Adjacent channel leakage ratio (ACLR)
• distributed amplifier
• Doherty amplifier
• efficiency
• wideband code division multiple access (WCDMA)

A new wideband distributed Doherty amplifier (WDDA) for wideband code division multiple access (WCDMA) repeater applications is reported. The distributed structure provides wideband performance while not needing an N-way splitter and combiner. The two-stage Doherty amplifiers achieve high gain and high efficiency. Also, the linearity of the WDDA is improved by the post-distortion using gate bias optimization of the Doherty amplifiers. For verification, the proposed WDDA is implemented using GaN HEMTs and tested with a one-carrier WCDMA signal at 2.14 GHz. From the measured results at an average output power of 36 dBm (10 dB back-off power), the WDDA shows an adjacent channel leakage ratio (ACLR) of -45 dBc at +/-5 MHz offset with a total gain over 24 dB and a total power-added efficiency over 15% over a 160 MHz bandwidth.

• 出版日期2009-10