跨导
回转率
拓扑(电路)
自动增益控制
循环(图论)
电气工程
物理
计算机科学
电压
晶体管
CMOS芯片
数学
工程类
组合数学
放大器
作者
Shubin Liu,Minglun Chen,Wenbin Huang,Xufeng Liao,Jiaxi Xu
出处
期刊:IEEE Transactions on Circuits and Systems Ii-express Briefs
[Institute of Electrical and Electronics Engineers]
日期:2022-11-01
卷期号:69 (11): 4218-4222
被引量:1
标识
DOI:10.1109/tcsii.2022.3187979
摘要
This brief presents a high current-efficiency rail-to-rail class-AB op-amp with dual-loop control. Based on the conventional folded cascode op-amp with gain-boost, a dual-loop control strategy consisting of a gain-boost loop and an adaptive output stage current control loop is proposed to achieve bidirectional large load driving capability and high DC gain. Furthermore, the adaptive output stage current control loop achieves class-AB operation with symmetric separate signal paths to the output transistors and high reconfigurability. In addition, the implementation of the constant transconductance ( $\text{g}_{\mathrm{ m}}$ ) rail-to-rail input and slew rate (SR) enhancement circuit is adopted to widen the input voltage range and improve the large-signal transient response. The proposed op-amp is fabricated in a 0.18- $\mu \text{m}$ 5 V CMOS process with an active area of about 0.25*0.27 mm2. Measured results show the proposed op-amp achieves over 122 dB DC gain, 1 MHz gain-bandwidth, and 2.1 V/ $\mu \text{s}$ SR under bidirectional load conditions (100pF and 10k $\boldsymbol{\Omega }$ ). At 1.5 V and 5.5 V supplies, positive current-efficiency (CE+) are 15 and 1780, negative current-efficiency (CE−) are 37 and 1658, power consumptions are 59.2 $\mu \text{W}$ and 225.5 $\mu \text{W}$ , respectively.
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