Title :
Multichannel constant current LED driver with high matching precision
Author :
Yu, D.J. ; Liu, Y. ; Yu, Q. ; Wu, S.Y.
Author_Institution :
State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Current mirror realized with resistance ratio and auto-zero technology with switch capacitor to reduce the influence of offset voltage are used to improve the matching precision. Without utilizing traditional current mirror the design simplifies the common current ratio circuit by multipliers of MOSFET in proportion. The output current matching precision of each output channel is nearly unaffected by the offset of each Operation Amplifier. The experiment results indicate that the method of multi output LED driver provides far great matching precision; it also has a simple design and has a smaller die size in layout.
Keywords :
MOSFET circuits; constant current sources; current mirrors; driver circuits; light emitting diodes; operational amplifiers; MOSFET multiplier; autozero technology; current matching precision improvement; current mirror; multichannel constant current LED driver; offset voltage reduction; operation amplifier; resistance ratio; switch capacitor; Capacitors; Equivalent circuits; Light emitting diodes; Mirrors; Resistance; Resistors; Switches; Current Mirror; Current match; LED Driver; Resistance Ratio;
Conference_Titel :
Electron Devices and Solid-State Circuits (EDSSC), 2014 IEEE International Conference on
DOI :
10.1109/EDSSC.2014.7061081
