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中速高精度模拟电压比较器的设计

消耗积分:10 | 格式:rar | 大小:618 | 2010-12-27

张磊

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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.

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