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首页> 外文期刊>IEEE transactions on circuits and systems . I , Regular papers >A Three-State Signal Coding Scheme for High Efficiency Class-S Amplifiers
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A Three-State Signal Coding Scheme for High Efficiency Class-S Amplifiers

机译：高效S类放大器的三态信号编码方案

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摘要

A three-state signal coding scheme is proposed for driving Class-S amplifiers with higher efficiency than conventional techniques. The approach is formulated in the framework of polar modulation, where the magnitude is controlled by a timing code that specifies positive and negative rectangular pulses as well as a third zero state, and the phase is varied by modulating the clock delay. In particular, high efficiency is attained when the active pulse widths are a half-cycle of the carrier frequency, and the zero-state is formed by skipping pulses. In this case, full-amplitude modulation has the same efficiency as a Class-D amplifier, and is only slightly degraded as the amplitude is decreased. In addition, the technique operates at only $2{times}$ sampling and is very simple to implement. Spectral analysis is performed for baseband signals consisting of single tones, 2-tone suppressed-carrier, and bandlimited random noise. The latter case emulates real communication signals and is shown to exhibit good spectral characteristics and low error-vector magnitude in the time domain. An important application of this technique is in all-digital, power-efficient power amplifiers for cellular base stations and handsets.
机译：提出了一种三态信号编码方案，用于以比传统技术更高的效率驱动S类放大器。该方法是在极性调制的框架内制定的，其幅度由指定正负矩形脉冲以及第三个零状态的时序代码控制，并且相位通过调制时钟延迟而变化。特别地，当有效脉冲宽度是载波频率的半个周期并且通过跳过脉冲来形成零状态时，可以获得高效率。在这种情况下，全振幅调制具有与D类放大器相同的效率，并且随着振幅的减小仅略微降低。此外，该技术仅在 $ 2 {times $ 采样下运行，并且实现起来非常简单。对由单音，2音抑制载波和带限随机噪声组成的基带信号执行频谱分析。后一种情况模拟真实的通信信号，并显示出在时域中具有良好的频谱特性和较低的误差矢量幅度。该技术的重要应用是用于蜂窝基站和手机的全数字，高功率效率功率放大器。

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