摘要
为了满足助听器SoC高精度、低功耗应用,提出一种基于8位逐次逼近模数转换器的混合信号型时分复用上电复位及模拟音量控制电路。该电路利用逐次逼近模数转换器输出结束标志信号作为时分信号,对电池电压和模拟音量电压进行交替检测。数字逻辑电路可实现对上电、欠压阈值以及延迟时间的灵活配置,同时也可进行信号处理以及产生上电复位和欠压报警信号。电路采用SMIC 130nm 1P8M混合信号工艺实现。测试结果表明,在供电电压1V时,电路能够完成高精度的上电复位、欠压报警和模拟音量检测功能;输入120 Hz正弦信号和15kHz时钟频率时,逐次逼近模数转换器输出信号最大信噪失真比为46.5dB,功耗仅有86μW。
For high resolution, low power application of hearing-aid SoC, a mixed-signal time-division power-on-reset （POR） and volume control circuit was proposed based on an 8-bit successive- approximation analog-to-digital converter （SAR ADC）. The end-of-converter （EOC） signal of SAR ADC is adopted as the time-division signal that makes circuit detect the battery voltage and volume voltage alternately. Digital logic circuit can realize the programmable POR, brown-out （BO） threshold and delay time. Finally it completes the signal process and generates the POR and BO signal. The circuit is implemented in SMIC 130nm 1P8M mixed-signal process. The tion measurement results show that in 1V power supply, the POR, BO and volume control funcare accomplished. With 120 Hz input sine and 15 kHz clock signal, the ADC shows that the maximum slgna to noise distortion ratio （SINAD） is 46. 5dB, and total power consumption is only 86 μw.
出处
《固体电子学研究与进展》
CSCD
北大核心
2017年第5期350-354,共5页
Research & Progress of SSE
基金
国家自然科学基金资助项目(61704143)
福建省中青年教师教育科研项目(JAT170428)
