一个90.9dB SNDR 95.3dB DR 音频德尔塔-西格玛调制器与FIA辅助的OTA
Gongxing Huang1, Cong Wei1, Rongshan Wei1
1College of Physics and Information Engineering, Fuzhou University, Fuzhou 350116, China.
Sensors (Basel, Switzerland)
|March 13, 2024
概括
本研究介绍了一种新型的低功耗,高收益集成器,使用一个采用浮式逆变器-放大器 (FIA) 辅助的OTA (Operational Transconductance Amplifier). 该设计实现了80dB的增益,将功率降低了30%,并改善了三角形-西格玛调制器的动态范围.
科学领域:
- 电气工程 电气工程
- 模拟集成电路设计模拟集成电路设计
背景情况:
- 操作传导放大器 (OTA) 对于模拟电路设计至关重要.
- 传统的OTA设计面临着收益和功率效率方面的局限性.
- 德尔塔-西格玛调制器需要高性能集成器来提高信号分辨率.
研究的目的:
- 为了呈现一个低功耗,高收益的集成器设计,使用一个cascode OTA与浮式逆变器放大器 (FIA) 的协助.
- 为了增强动态范围 (DR) 并降低离散时间delta-sigma调制器中的量子化噪声.
- 为辅助OTA优化FIA驱动电容和时钟方案.
主要方法:
- 为低功耗,高收益的集成器设计了一个以FIA协助的cascode OTA.
- 包含一个三级量化器来改善动态范围和减轻量化噪声.
- 开发了一个简化的反数字对模拟转换器 (DAC),没有额外的不匹配塑造技术.
主要成果:
- 与传统的cascode设计相比,实现了80dB的高增益,降低了30%的功耗.
- 在0.18μm CMOS工艺中制造了第三阶离散时间的三角形-西格玛调制器.
- 该调制器以1.8V工作,消耗221μW,带宽为24kHz,测量SNDR和DR的分别为90.9dB和95.3dB.
结论:
- 拟议的FIA辅助的cascode OTA集成器在增益和功率效率方面提供了显著的改进.
- 三级定量器和简化的DAC设计的整合有效地提高了动态范围并减少了噪声.
- 制造的delta-sigma调节器展示了拟议设计的低功耗应用的实际可行性和性能优势.
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