X-Parameter Characterization of LDMOS Devices for Broadband Doherty High-Power Amplifier Design

A. Cidronali, G. Collodi
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引用次数: 10

Abstract

We present a novel design approach of high-power broadband Doherty amplifier (DPA) by the X-parameters. It is based on the nonlinear vector network analysis of the 3-port circuit composed of the main and peak power devices, connected to the input network. The technique permits the analysis of the best termination for both the peak and main devices, mutually interacting by the input network, and development of the broadband output networks which optimizes the mutual devices load modulation. The three-port nonlinear vector characterization method was applied to the analysis of a broadband DPA designs based on a pair of Silicon Laterally Diffused MOSFETs (LDMOS) with optimized peak power and efficiency in the 700 MHz to 960 MHz bandwidth. The DPA performance exhibited a peak power of 54.2 dBm at center frequency with a peak drain efficiency up to 71.5%. and a drain efficiency in excess of 68 % within 8-dB back-off at center frequency band.
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用于宽带Doherty大功率放大器设计的LDMOS器件的x参数表征
提出了一种基于x参数的高功率宽带多尔蒂放大器(DPA)设计方法。它是基于非线性矢量网络分析的3口电路组成的主和峰值功率器件,连接到输入网络。该技术允许分析由输入网络相互作用的峰值和主设备的最佳终端,并开发优化相互设备负载调制的宽带输出网络。采用三端口非线性矢量表征方法分析了在700 ~ 960 MHz带宽范围内,基于一对硅横向扩散mosfet (LDMOS)优化峰值功率和效率的宽带DPA设计。DPA在中心频率处的峰值功率为54.2 dBm,峰值漏极效率高达71.5%。在中心频段,在8db退偏范围内,漏极效率超过68%。
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