Abstract
A novel 900 MHz outphasing power amplifier using LDMOS transistors has been developed. It uses a distributed active transformer for high efficiency impedance transformation and lossless power combining. The current mode class-D amplification technique is applied to amplify constant envelope and outphasing signals. The outphasing power amplifier has been tested with the wideband code division multiple access signal (WCDMA) and the 900 MHz continuous wave (CW) signal. The proposed design is suitable for fully integrated power amplification on silicon.
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