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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。
In order to meet the high accuracy and low power consumption of hearing aid SoCs, a mixed-signal TDM power-on reset and analog volume control circuit based on 8-bit successive approximation ADC is proposed. The circuit uses the successive approximation analog-digital converter output end mark signal as a time-division signal, the battery voltage and analog volume voltage alternately detected. Digital logic enables flexible configuration of power-up, under-voltage thresholds and delay times as well as signal processing and generation of power-on-reset and brown-out alarm signals. Circuit using SMIC 130nm 1P8M mixed signal technology to achieve. The test results show that the circuit can perform high-precision power-on reset, under-voltage alarm and analog volume detection at the supply voltage of 1V. When inputting the 120 Hz sine signal and the 15 kHz clock frequency, the maximum signal of the A / D converter output signal Noise distortion ratio of 46.5dB, power consumption is only 86μW.