摘要
针对传统的比较器速度较慢的问题,提出了一种速度可选的高速比较器。比较器采用轨到轨输入结构。高速比较器的预放大器电路由两级差分放大器构成,预放大结果送入一个Latch锁存器电路得到比较结果。Latch锁存器电路降低了比较器的延迟,提高了比较器的速度。比较器电路里面添加了比较器反向输入端模式选择电路、比较器速度模式选择电路、比较器输出极性选择电路、比较器迟滞端选择电路。比较器的反向输入端有八种选择模式,比较器的速度有四种选择模式,比较器的迟滞端有四种选择模式。比较器电路的轨到轨输入结构可以检测2mV的差模电压。由于设计的轨到轨输入高速比较器需要应用于1.2V的A/D转换器中,从而在电路中加入了3.3V转1.2V的buck型电平转换电路。实现了轨到轨输入,速度可选,迟滞端可选,buck型电平转换的多功能比较器。
Aiming at the slow speed of traditional comparators,a high-speed comparator with optional speed is proposed.The comparator applies a rail to rail input structure.The pre-amplification circuit of the high-speed comparator is composed of a two-stage differential amplifier,and the result of the amplifier is fed into a latch circuit to get the comparison result.The latch circuit reduces the comparator delay and increases the comparator speed.In the comparator circuit,a comparator reverse input mode selection circuit,a comparator speed mode selection circuit,a comparator output stage selection circuit,and a comparator lag terminal selection circuit are added.The reverse input of the comparator has eight selection modes,the speed of the comparator has four selection modes,and the lag end of the comparator has four selection modes.The rail-to-rail input structure of the comparator circuit can detect differential mode voltage of 2mV.A multifunctional comparator with rail to rail,optional speed and optional hysteresis end is realized.
作者
韩梅
赵宏建
HAN Mei;ZHAO Hongjian(The 47th Institute of China Electronics Technology Group Corporation,Shengyang 110000,China)
出处
《微处理机》
2025年第3期24-29,共6页
Microprocessors
关键词
轨到轨
速度可选
迟滞可选
buck型电平转换
高速
Rail-to-rail
Optional speed
Optional hysteresis
Buck type level switching
High speed
