| 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。 |
| 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 |
| DOI： |
|
| 基金项目:重庆市教委自然科学基金资助项目（KJ101107） |
|
| Design of a novel digital power amplifier based on Σ-Δ modulation |
| ZHAO Wei-wei,YU Xian-lun,SONG Chuan-qiang |
| () |
| Abstract: |
| The principle of 2nd-order sigma-delta(Σ-Δ) modulation technology is analysed.
The dig
ital Class-D amplifier circuitry is designed based on the over-sampling,interpol
ation filtering and Σ-Δ modulation.Modeling and simulation are performed.Resul
ts sh
ow 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 a
pplication value. |
| Key words: digital power amplifier over-sampling rate Σ-Δ modulation noise shaping int
erpolation filtering |
