Available load power in a RIF class D amplifier with a Sigma-Delta modulator driver

被引：0
作者：
Johnson, T [1 ]
Stapleton, S [1 ]
机构：
[1] Simon Fraser Univ, Sch Engn Sci, Burnaby, BC B5A 1S6, Canada
来源：
RAWCON: 2004 IEEE RADIO AND WIRELESS CONFERENCE, PROCEEDINGS | 2004年
关键词：
sigma-delta modulation; power amplifiers; class; D; encoding; efficiency; radio frequency;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A conventional RF Class D amplifier is nonlinear and is limited to constant envelope signals. By augmenting a RF Class D amplifier with a sigma-delta (SigmaDelta) modulator, the class of signals is extended to include time varying envelope signals. The available load power delivered by a class D amplifier depends on the spectral properties of the SigmaDelta pulse train. A measure called coding efficiency is defined to quantify the spectral characteristics of the pulse train and the parameter is incorporated in class D design equations. The average pulse frequency of the SigmaDelta pulse train affects switching losses in the amplifier and the average pulse frequency for a fourth order bandpass modulator is simulated. A 1W 1GHz voltage switched class D amplifier is designed and simulated to verify the coding efficiency and average pulse frequency parameters.
引用
收藏
页码：439 / 442
页数：4
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