Bandgap Reference Voltage Generator

• Main Authors: Chin-Hung Cheng, 鄭欽鴻
• Other Authors: Chern-Lin Chen
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/10794634026978236467

碩士 === 國立臺灣大學 === 電子工程學研究所 === 92 === 　　Precision voltage reference plays an important role in modern integrated circuits systems. It can produce a stable reference voltage insensitive to the variations of supply voltage and temperature. Voltage references are widely adopted in many integrated circuits, such as A/D or D/A converters, operational amplifiers, and linear regulators. They are used for defining input/output voltage range, biasing current source of differential pairs, and providing a comparison reference for comparators, etc. 　　The objective of this thesis is to design a bandgap reference voltage generator with input voltage 3V to 6V and output voltage around 1.25V. This reference voltage is intended for using in low dropout linear regulators (LDO). A pre-regulator circuit feeds the bandgap circuit with a regulated 2V to lower the supply voltage sensitivity. A new bandgap circuit topology is also presented. The final bandgap reference with supply voltage sensitivity less than 0.3 mV/V, and temperature coefficient around 7 ppm/℃, and power consumption lower than 100μW is achieved.