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引用次数: 3
摘要
提出了一种0.4V 6.5nW 10b 2.5kS/s SAR ADC，用于无线微传感器网络、生物医学和能量收集系统等能量限制应用。ADC在极低的电源电压(0.4V)下工作，以降低功耗并消除短路电流。优化了数字块中mosfet的通道长度，以最小化数字功耗。该结构具有单元电容小、顶部寄生电容低的特点。仿真结果表明，在Nyquist输入频率下，SFDR、SNDR和ENOB分别为63.8dB、58.1dB和9.4bit。优点系数(FOM)为3.98fJ/反步。
A 0.4V 6.5nW 10b 2.5kS/s SAR ADC is proposed for energy-limited applications such as wireless micro-sensor networks, biomedical, and energy harvesting systems. The ADC operates at extremely low supply voltage (0.4V) to reduce power consumption and to eliminate short-circuit current. The channel length of MOSFETs in digital block is optimized to minimize digital power consumption. Small unit capacitor and low top parasitic capacitance is obtained by the proposed capacitor structure. The simulation results show that SFDR, SNDR, ENOB are 63.8dB, 58.1dB and 9.4bit at Nyquist input frequency, respectively. The figure-of-merit (FOM) is 3.98fJ/conv-step.
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