This paper explores the noise performance limits of the differential configurations of differential transimpedance amplifiers (TIAs), which serve as a current detection front-end and converts signals for backend signal processing. TIA is one of the most frequent module adopted in biological and environmental sensing such as hall sensors and DNA synthesis detection, which require noise density down to sub-pA/√Hz with micro-watt power consumption so detailed analysis on the noise performance is required. The noises for three different TIAs, including the common-gate topology, op-amp based resistive feedback and capacitive feedback, have been investigated and simulated. Among them, op-amp based capacitive feedback, which bases on integration of input current, displays the lowest noise and best performance. Simulated in 180 nm CMOS process, the capacitive feedback technology shows an input-referred noise of 16 fA/√Hz (80 fA/√Hz) at 10 kHz (100 Hz), featuring it a promising solution for current detection.
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机译:本文探讨了差分跨阻抗放大器(TIAS)的差分配置的噪声性能限制,其用作电流检测前端并转换用于后端信号处理的信号。 TIA是在霍尔传感器和DNA合成检测等生物和环境感官中采用的最常用模块之一,这需要噪声密度下降到具有微型瓦特功耗的子PA /√Hz,因此需要详细分析噪声性能。已经研究了三种不同TiS的噪音,包括公共栅极拓扑,基于OP-AMP的电阻反馈和电容反馈,并模拟。其中,基于OP-AMP的电容反馈,基于输入电流的集成,显示最低的噪声和最佳性能。在180nm CMOS工艺中模拟,电容反馈技术显示了10 kHz(100Hz)的16个FA /√Hz(80 fa /√Hz)的输入引用噪声,其中包括一个有希望的电流检测解决方案。
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