基于Σ-Δ调制的新型数字功率放大器设计  

Design of a Novel Digital Power Amplifier Based on Σ-Δ Modulation

作　　者：赵威威[1] 余先伦[1] 宋传强[1] 

机构地区：[1]重庆三峡学院电子与信息工程学院,重庆404100

出　　处：《电讯技术》2012年第1期91-95,共5页Telecommunication Engineering

基　　金：重庆市教委自然科学基金资助项目(KJ101107)~~

摘　　要：分析了二阶Σ-Δ调制技术的原理,设计了基于过采样、插值滤波和噪声整形技术、Σ-Δ调制的数字D类功率放大器,并进行了建模仿真。仿真结果表明,设计的Σ-Δ调制数字功率放大器输出信噪比高,开关损耗小,整个系统工作频率低。Σ-Δ调制新型数字功率放大器可以用低端硬件方便实现,有很好的应用价值。The principle of 2nd - order sigma - delta（∑-△） modulation technology is analysed. The digital Class ＇ D amplifier circuitry is designed based on the over - sampling, interpolation filtering and ∑-△ modulation. Modeling and simulation are performed. Results show that the designed power amplifier is featured by high output signal-to-noise ratio（SNR）, low switching loss and low operating frequency. The new digital power amplifier can be realized with low- end hardware conveniently and has splendid application value.

关 键 词：数字功率放大器 过采样率 Σ-Δ调制 噪声整形 插值滤波 

分 类 号：TN722[电子电信—电路与系统]