论文部分内容阅读
提出了一种应用于助听器的单环3阶开关电容ΣΔ调制器,采用双采样技术通过提高过采样率来改善调制器的性能,详细分析了双采样中电容失配的影响.为进一步降低功耗,OTA采用了class-AB结构,并对后级的运放进行了缩放.采用栅压自举技术消除了低压下CMOS开关的开通电阻由于栅源电压变化而引起的非线性问题.整个调制器过采样率128.后仿结果表明,在SMIC 0.13μm CMOS MIX Signal工艺下,输入信号为2 kHz时该调制器在8 kHz信号带宽内,达到了92 dB的信噪失真比.在1 V电源电压下功耗仅为38μW.核心版图面积为0.25 mm2.
A single-loop 3rd-order switched capacitor ΣΔ modulator for hearing aids is proposed. The dual-sampling technique is used to improve the performance of the modulator by increasing the oversampling rate. The effect of capacitance mismatch in double sampling is analyzed in detail. OTA uses a class-AB structure, and the latter stage of the operational amplifier has been scaled. The use of gate-voltage bootstrap technique eliminates the low-voltage CMOS switch on-resistance due to gate-source voltage variation caused by the nonlinear problem. The entire modulation Oversampling rate of 128. The post-simulation results show that the modulator achieves a 92 dB SINR within 8 kHz signal bandwidth at an input signal of 2 kHz at the SMIC 0.13 μm CMOS MIX Signal process. At 1 V The power consumption of the power supply is only 38μW. Core layout area of 0.25 mm2.