Using voltage controlled current source (VCCS) instead of electrical series resistance (ESR) of load capacitor to create a zero is a novel LDO frequency compensation scheme. This paper analyzes this compensation scheme, and reveals that the VCCS circuit conduces to the improvements of transient response and PSR performance of LDO. A new area compact VCCS circuit that has a nearly ideal performance in wide frequency spectrum up to SMHz is also presented. Using VCCS, a LDO with 300mV dropout, 2.5V output voltage and 100mA output current is designed in 0.5μm CMOS technology with pretty frequency performance, transient response and PSR performance. The total on-chip capacitor employed in this LDO is less than 1pF. © 2005 IEEE.
CITATION STYLE
Qiang, B., Zushu, Y., Yuanfu, Z., & Suge, Y. (2005). Analysis and design of voltage controlled current source for LDO frequency compensation. In 2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC (pp. 363–366). Institute of Electrical and Electronics Engineers Inc. https://doi.org/10.1109/EDSSC.2005.1635282
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