N. Giovannelli, A. Cidronali, P. Singerl, S. Maddio, C. Schuberth, Andrea Del Chiaro, G. Manes
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引用次数: 15
摘要
我们讨论了在550 MHz至770 MHz带宽范围内优化峰值功率和效率的宽带LDMOS Doherty PA (DPA)的开发。该设计由一个涉及多段阻抗变换的宽带输出组合器实现。DPA在48 dBm平均功率下提供46%以上的全频段平均效率，支持8mhz带宽和10.5 dB的PAPR的DVB-T信号。采用数字预失真的DPA样机在带宽上限下实现了- 50 dBc的目标ACPR。
A 250W LDMOS Doherty PA with 31% of fractional bandwidth for DVB-T applications
We discuss the development of a wideband LDMOS Doherty PA (DPA) with optimized peak power and efficiency over 550 MHz to 770 MHz of bandwidth. The design was enabled by a wideband output combiner which involves multisection impedance transformation. The DPA delivers more than 46% average efficiency across the band at 48 dBm average power supporting DVB-T signal with 8 MHz bandwidth and PAPR of 10.5 dB. The DPA prototype achieves the target ACPR of - 50 dBc at the upper limit of the bandwidth if digital predistortion is applied.
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