Title :
Design of High-Performance Voltage Regulators Based on Frequency-Dependent Feedback Factor
Author :
Shen, Liangguo ; Yan, Zushu ; Zhang, Xing ; Zhao, Yuanfu ; Wang, Yuan
Author_Institution :
Inst. of Microelectron., Peking Univ., Beijing
Abstract :
A novel scheme is presented for achieving high performance low-dropout (LDO) voltage regulators under the constraint of low supply voltage. This scheme makes use of a frequency-dependent feedback factor (FDFF). The FDFF has simple circuit structure and frequency-dependent gain. When it is used in the proposed LDO, the low voltage operation ability, wide-band high power-supply rejection (PSR) characteristic and excellent transient response performance can be obtained. Simulation results show that this LDO can work properly at 1.2-V supply voltage, and the overshoot is only 1mV, while the PSR is better than -40dB from dc to 100-MHz. Therefore, the FDFF based LDO is well suited for low-voltage ripple-sensitive applications.
Keywords :
circuit feedback; transient response; voltage regulators; 1.2 V; frequency-dependent feedback factor; frequency-dependent gain; low-dropout voltage regulators; power-supply rejection characteristic; transient response performance; Channel bank filters; Circuits; Frequency; Low voltage; Microelectronics; Output feedback; Regulators; Transfer functions; Transient response; Wideband;
Conference_Titel :
Circuits and Systems, 2007. ISCAS 2007. IEEE International Symposium on
Conference_Location :
New Orleans, LA
Print_ISBN :
1-4244-0920-9
Electronic_ISBN :
1-4244-0921-7
DOI :
10.1109/ISCAS.2007.377873
