摘要
分析了目前几种高性能连续时间 CMOS电流比较器的优缺点 ,提出了一种新型 CMOS电流比较器电路 .它包含一组具有负反馈电阻的 CMOS互补放大器、两组电阻负载放大器和两组 CMOS反相器 .由于 CMOS互补放大器的负反馈电阻降低了它的输入、输出阻抗 ,从而使电压的变化幅度减小 ,所以该电流比较器具有较短的瞬态响应时间和较快的速度 .电阻负载放大器的使用减小了电路的功耗 .利用 1.2 μm CMOS工艺 HSPICE模型参数对该电流比较器的性能进行了模拟 ,结果表明该电路的瞬态响应时间达到目前最快的 CMOS电流比较器的水平 ,而功耗则低于这些比较器 ,具有最大的速度 /功耗比 .此外 ,该 CMOS电流比较器结构简单 ,性能受工艺偏差的影响小 ,适合应用于高速
The advantages and disadvantages of existing high performance continuous time CMOS current comparators are analyzed,and a novel CMOS current comparator is proposed It comprises one CMOS complementary amplifier with negative resistance feedback,two resistive load amplifiers and two CMOS inverters Because the input and output resistance of the CMOS complementary amplifier decreases owing to the negative feedback resistor,the voltage swings are reduced,and the response time of the current comparator is short and the speed is fast The power consumption of the current comparator has decreased by using the resistive load amplifiers Simulation results based on 1 2μm CMOS technology HSPICE model show the response time of the novel current comparator is comparable with those of the existing fastest CMOS current comparators,while its power consumption is the lowest,so its speed/power ratio is the best Furthermore,due to the simple circuit structure of the novel current comparator and its perfect,performance of deviations,it is very suitable for the high speed/low power current mode integrated circuits
基金
国家自然科学基金资助项目 !(项目编号 6963 60 3 0 )&&
