A High Precision Bandgap Reference Used in Power Management ICs

—A 2.5V high precision BiCMOS bandgap reference with supply voltage range of 6V to 18V was proposed and realized. It could be applied to lots of Power Management ICs (Intergrated Circuits) due the high voltage. By introducing a preregulated current source, the PSRR (Power Supply Rejection Ratio) of 103dB at low frequency and the line regulation of 26.7µV/V was achieved under 15V supply voltage at ambient temperature of 27ºC. Moreover, if the proper resistance trimming is implemented, the temperature coefficient could be reduced to less than 16.4ppm/ºC. The start up time of the reference voltage could also be decreased with an additional bipolar and capacitor.

• Type: Journal
• Year: 2007
• Where: ENGL
• Authors: Gu Shurong, Wu Xiaobo, Yan Xiaolang
• Keywords: ENGL 2007, Power Supply Rejection Ratio, Supply Voltage, Supply Voltage Range