Abstract
In this work, TSMC SiGe0.35μm technology is used to design a low noise analog integrated circuit. This work is called 「Noise Improvement of Low-frequency, Low-power Rail-To-Rail Differential Input Op-Amp」, and is simulated by H-SPICE. It uses BiCMOS technology replacing CMOS technology in the differential input stage to improve noise in Op-Amp circuits. Through simulation and comparison, the results show that noise in the BiCMOS rail-to-rail differential input Op-Amp is better than noise in CMOS rail-to-rail differential input Op-Amp. Finally, rail-to-rail instrumentation Amps are integrated by these two kinds of Op-Amp, and then they are simulated and compared again. The simulation and comparison results show that noise is significantly improved when using BiCMOS rail-to-rail differential input Op-Amps. In addition, this paper mentions the designed rail-to-rail instrumentation Amps could be applied as ECG Amplifier in the medical electronic. This paper also introduces what is ECG and ECG related electronics.