類比電路應用中常常需要一個不受電壓溫度變化影響的參考電壓以提升精確度， 本文使用TSMC 0.18 um 設計一個兩級運算放大器去改良帶差參考電源電路的輸出電壓誤差值。使用電路模擬軟體(Advanced Design System)模擬，溫度從-20°C變化到100°C 時，輸出電壓變化量為18mV。輸出電壓為820mV。 Analog circuit often need a temperature and voltage independent reference。This article use TSMC 0.18 um to design a second order operational amplifier to improve the output of bandgap reference. We use simulation software (Advanced Design System) to simulate this circuit, the temperature dependent deviation is 18mV from -20°C to 100°C. The output voltage is 820mV。
