Title :
An Adaptive Current-Boosting Voltage Buffer for Low-Power Low Dropout Regulators
Author :
Leung, Ka Nang ; Ng, Yuen Sum ; Yim, Ka Yee ; Or, Pui Ying
Author_Institution :
Chinese Univ. of Hong Kong, Shatin
Abstract :
A voltage buffer to solve the slew-rate limit problem at the gate of the power transistor of LDOs is proposed in this paper. The proposed idea, based on the capacitive-coupling method to provide an instantaneous boost of the transient current to charge/discharge the gate capacitance of the power transistor, provides power saving of the voltage buffer and enables fast load transient responses of the LDOs simultaneously. The proposed idea is applied to a LDO design and simulated with BSIM models of a commercial 0.35-mum CMOS technology. The quiescent current is about 3.5 muA, and the setting time of the load transient response is greatly improved, when comparing to the LDO without the proposed idea.
Keywords :
CMOS integrated circuits; low-power electronics; power transistors; transient response; voltage control; BSIM models; CMOS technology; adaptive current-boosting voltage buffer; capacitive-coupling method; gate capacitance; instantaneous boost; load transient response; low-power low dropout regulators; power saving; power transistor; quiescent current; slew-rate limit problem; transient current; CMOS technology; Capacitance; Capacitors; Frequency; Paramagnetic resonance; Power transistors; Regulators; Semiconductor device modeling; Transient response; Voltage;
Conference_Titel :
Electron Devices and Solid-State Circuits, 2007. EDSSC 2007. IEEE Conference on
Conference_Location :
Tainan
Print_ISBN :
978-1-4244-0637-1
Electronic_ISBN :
978-1-4244-0637-1
DOI :
10.1109/EDSSC.2007.4450168
