軌到軌輸入輸出范圍運算放大器的噪聲分析和優(yōu)化
權(quán)進(jìn)國1 張獻(xiàn)英2
（1.清華大學(xué)深圳研究生院，深圳 2.中國網(wǎng)絡(luò)通信集團(tuán)有限公司深圳分公司， 深圳 518055）
摘 要：這篇文章設(shè)計了一個軌到軌（Rail-to-Rail）輸入輸出范圍的低噪聲運算放大器，在輸入級采用電流補(bǔ)償?shù)姆椒▉矸€(wěn)定該運算放大器在整個輸入共模范圍內(nèi)的跨導(dǎo)，在輸出級使用了AB 類的輸出方法來提高運算放大器的輸出范圍，且詳細(xì)分析了該運算放大器的噪聲性能，在此基礎(chǔ)上給出了改善該運算放大器噪聲性能的方法，以此來提高該運算放大器的動態(tài)范圍。
關(guān)鍵詞：軌到軌；跨導(dǎo)；閃爍噪聲；運算放大器；動態(tài)范圍
Noise analysis and improvement of Rail-to-Rail input and output range operational amplifier
QUAN Jin-guo1, ZHANG Xian-ying2
（1.Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055，China
2.Shenzhen branch of CHINA NETCOM, Shenzhen 518057，China）
Abstract: This article gives a low noise Rail-to-Rail input and output range operational amplifier. In the input stage, current compensation technique is used
to give a constant transconductance in the whole common mode input range; in the output stage, a simple class AB output stage is used to improve the output
range. The noise character of the operational amplifier is analyzed, and the way to improve the noise character of this operational amplifier is given, as can
improve the dynamic range of this operational amplifier.
Key words: Rail-to-Rail; transconductance; flicker noise; operational amplifier; dynamic range