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本文提出了一种用于CDMA发射器功率放大器供电的宽带低纹波稳压器，实现了10MHz带宽和2mV纹波。该设计解决了极坐标发射器中包络跟踪电源调制器的宽带和高效率需求问题。
Polar modulation has been proven to be an effective way to build high-efficiency high-linearity power amplifier systems [1]. In a polar transmitter, high-efficiency non-linear power amplifiers can be used for linearly modulated waveforms. Because of envelope bandwidth expansion in polar modulated transmitters, the design of a wide-bandwidth high-efficiency supply modulator is one of the most challenging aspects of a polar transmitter. The most common technique for providing wide-bandwidth low-noise supply modulation in a linear system PA is by using linear low-dropout regulators, however at backed-off power levels their efficiencies are low
Wing-Yee Chu, Bertan Bakkaloglu, Sayfe Kiaei
Arizona State University, Tempe, AZ