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设计了一种新型的适用于低阈值电压(≤0.2 V)比较的比较器电路,用折叠结构作为差分输入,并将输入电压通过三极管转换成电流,再与原静态工作电流比较,得到比较器的电压输出。该电路的特点是将低阈值电压比较转换成电流比较,且利用威尔逊电流镜来确定直流工作点,省去了传统折叠式电压比较器输入级所必需的用于共源共栅器件的直流偏置电路,并有很好的精度和动态响应特性。
A new comparator circuit for low threshold voltage (≤0.2 V) is designed. The folded structure is used as the differential input, and the input voltage is converted to current through the transistor. Then the comparator is compared with the original quiescent operating current to obtain a comparator Voltage output. The circuit is characterized by the comparison of low threshold voltage into a current comparison, and the use of Wilson current mirror to determine the DC operating point, eliminating the traditional folding voltage comparator input stage required for cascode devices DC bias Set the circuit, and have good accuracy and dynamic response characteristics.