| Citation: |
Shen Liangguo, Yan Zushu, Wang Zhao, Zhang Xing, Zhao Yuanfu. Analysis and Design of a High-Stability,High-Accuracy,Low-Dropout Voltage Regulator[J]. Journal of Semiconductors, 2007, In Press.
Shen L G, Yan Z S, Wang Z, Zhang X, Zhao Y F. Analysis and Design of a High-Stability,High-Accuracy,Low-Dropout Voltage Regulator[J]. Chin. J. Semicond., 2007, 28(12): 1872.
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Analysis and Design of a High-Stability,High-Accuracy,Low-Dropout Voltage Regulator
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Abstract
A high-accuracy,low-dropout (LDO) voltage regulator is presented.Using the slow-rolloff frequency compensation scheme,the LDO effectively overcomes the stability problem,facilitates the use of a ceramic capacitor,and improves the output voltage accuracy,which is critical for powering high-performance analog circuitry.The slow-rolloff compensation scheme is realized by introducing three pole-zero pairs,including the proposed pole-zero pair and sense zero.The post-layout simulation results demonstrate that this LDO has robust system stability,a high open-loop gain,and a high unit-gain frequency,which lead to excellent regulation and transient response performance.The line and load regulation are 27μV/V and 3.78μV/mA,and the overshoots of the output voltage are less than 30mV,while the dropout voltage is 120mV for a 150mA load current. -
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