论文标题
使用基于切片的类AB放大器的双向电流电位电位
A Bidirectional Current-Mirror Based Potentiostat Using a Slice-Based Class-AB Amplifier
论文作者
论文摘要
提出了一个由多通道双向电流摩擦剂组成的Pico-Ampere敏感的电化学传感器信号采集链，并提出了一个多重电流输入的Delta-Sigma（$Δς$）ADC。基于切片的AB放大器具有输出阶段电流复制，使用可重新配置的电流效果使双向电流传感在五十年的范围内。复制电流由ADC数字化。拟议的电路达到的最小可检测电流为91.7 PA，导致传感器电流的动态范围为147 dB，最高为$ \ pm $ 1 mA。电位仪以3 V电源为单位，ADC处于1.5V。单个接口通道的静态功耗取决于活动放大器切片的数量，介于14.1 $μ$ W和39.3 $μ$ W之间。相似系统之间的最高功率效率和少于500 mV的低压净空消耗量可以使该界面用于多种传感应用程序。
A pico-ampere sensitive electrochemical sensor signal acquisition chain consisting of a multi-channel bidirectional current-mirror based potentiostat and a multiplexed current-input delta-sigma ($ΔΣ$) ADC is presented. Slice-based class-AB amplifiers with output stage current replication using reconfigurable current-mirrors enable bidirectional current sensing over a range of five decades. The replicated current is digitized by the ADC. The proposed circuit achieves a minimum detectable current of 91.7 pA, resulting in a dynamic range of 147 dB for sensor currents up to $\pm$1 mA. The potentiostat is operated at a 3 V supply, the ADC at 1.5 V. The static power consumption of a single interface channel depends on the number of active amplifier slices and is between 14.1 $μ$W and 39.3 $μ$W. The highest power efficiency among similar systems and the low voltage headroom consumption of less than 500 mV enables a versatile use of the interface for multiple sensing applications.
