资 源 简 介
设计一种中速高精度模拟电压比较器，该比较器采用3级前置放大器加锁存器和数字触发电路的多级结构，应用失调校准技术消除失调，应用共源共栅结构抑制回程噪声干扰；应用数字触发电路获得高性能数字输出信号，设计采用0.35μm5V CMOS工艺实现一个输入电压2.5V、速度1MS/s、精度12位的逐次逼近型A/D转换器。Hspice仿真结果表明：在5V供电电压下，速度可达20MHz，准确比较0.2mV电压，有效校准20mV输入失调，功耗约1mW。
Abstract:
A moderate-speed and high precision analog voltage comparator is designed，in which a mulTI-stage structure consisTIng of three pre-amplifiers，a latch and a digital flip-flop circuit are adopted.The comparator uses an offset cancellaTIon technique to cancel offset，uses a cascode circuit to retrain kickback noise，and uses a digital flip-flop circuit to make a high performance digital output signal.Designed and fabricated in0.35μm5V CMOS technology，the comparator is used in a range of2.5V，1MS/s，12-bit successive approximaTIon analog-to-digital converter.Hspice simulation results show that this comparator distinguishes0.2mV at20MHz under5V supply voltage，and effectively calibrate20mV input offset，with about1mW power consumption.
