The Design of A Substrate Voltage Select Circuit with High Slew Rate
Qin Zhong-yang · China Integrated Circuit · 2008
Based on the 0.5μm 5V DPTM CMOS process, a substrate voltage select circuit for LED driver chip is presented in this paper. The proposed circuit,which based on peak current mirror and source input comparator with forward feedback, makes the circuit can operate under low voltage and has a high slew rate besides a definite hysteresis. In order to the output matches to the maximal voltage in the chip, a special output stage is designed . The simulation results of comparator show that a slew rate of 55.7V/μs and a hysteresis of 0.2V is achieved.