1. 中国科学院 上海高等研究院,上海,201203
2. 中国科学院大学 机构,北京,101408
3. 中国科学院 机构 红外成像材料与器件重点实验室,上海,200083
纸质出版:2017
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陈峥涛, 张钊锋, 梅年松, 林莉. 基于改进开关型OTA的低压低功耗ΣΔ调制器[J]. 微电子学与计算机, 2017, 34(9): 53-57.
CHEN Zheng-tao, ZHANG Zhao-feng, MEI Nian-song, et al. A Low-Voltage Low-Power Improved Switched-OTA-Based ΣΔ Modulator[J]. 2017, 34(9): 53-57.
设计了一种应用于音频的5阶离散时间单环单比特量化ΣΔ调制器.提出一种改进的开关型AB类运算跨导放大器(OTA) 电路
实现了低电压下积分器的低功耗和高转换速率.OTA仅在半时钟周期工作
有效降低调制器功耗.电路采用TSMC 0.18 m 1P4M标准CMOS工艺实现
后仿真结果表明
无杂散动态范围(SFDR) 和信号噪声失真比(SNDR) 分别达97.6 dB和87.3 dB
调制器版图面积0.4 mm.在1V电源电压下
消耗电流260 A
品质因数(FoM) 达到286 fJ/c-step
实现了低压低功耗高精度的设计目标.
A 5-order discrete-time (DT) single-loop single-bit-quantized ΣΔ modulator for audio application was designed.An improved Class-AB switched-OTA was proposed
which made the integrator achieve low power dissipation and high slew rate in low voltage.OTA worked at half of the clock cycle and effectively saved power of the modulator.Post simulation showed that the modulator achieved 97.6-dB SFDR and 87.3-dB SNDR.The total area was 0.4 mm.At 1-V power supply
the modulator consumed 260 A current and the FoM was 286 fJ/c-step
which achieved the low-voltage low-power high-accuracy design target.
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