Design of Voltage Comparator with Extraordinary Low Threshold
Han Xiao-chun · Dianzi qijian · 2007
To accomplish a voltage comparator with very low threshold and high precision that is quite complex in the integrated circuit of single power supply,a new comparator with extraordinary low threshold is designed.The highlight of the design is that the relation of positive proportion between the difference of voltage for triode emitter and thermal volt of the comparator is used as its low threshold.The comparator can be applied to many occasions where the very low threshold is required while the conventional comparator cannot fit.The circuit combining a switch power supply controller based on quasi-resonant operation is realized in 0.6 μm BCD technology and simulated using workview and Hspice.The simulation results show that its threshold is 50 mV and can be conveniently adjusted according to the requirements.It also has high precision and response property.The circuit is simple and easy to use.It can be widely applied to different SoC environment.