Transmitter utilising bandpass delta-sigma modulator and switching mode power amplifier
Transmitter utilising bandpass delta-sigma modulator and switching mode power amplifier
复制标题
采用带通 Delta-Sigma 调制器和开关模式功率放大器的发射机
DOI：
10.1109/iscas.2004.1328274
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
K. Halonen
中科院分区：
文献类型：
--
作者：
J. Ketola;J. Sommarek;J. Vankka;K. Halonen
本文提出了一种采用δ - σ调制和开关模式功率放大器的发射机概念。以WCDMA基站发射机的规格为目标。在D/ a转换中使用δ - σ调制，可以避免多比特D/ a转换器的大多数非线性。此外，δ - σ调制器的1位输出信号适用于功率高效的开关模式功率放大器。研究了利用信号图像来降低所需采样频率的方法。讨论了在这种拓扑结构下实现宽带发射机的问题和可能的解决方案。
In this paper a concept of a transmitter using delta-sigma modulation and switching mode power amplifier is presented. The specifications of a WCDMA base station transmitter are as an objective. Using a delta-sigma modulation in a D/A conversion, most of the nonlinearities of a multi-bit D/A converter are avoided. In addition the 1-bit output signal of the delta-sigma modulator is suitable for power efficient switching mode power amplifiers. The use of the images of the signal is studied as a method to reduce the required sampling frequency. The problems and possible solutions in implementing a wideband transmitter with this topology are discussed as well.