Title :
A noise-shaped buck DC-DC converter based on a 3rd-order continuous-time active-passive sigma-delta modulator
Author :
Yan, Wei ; Li, Wenhong ; Liu, Ran
Author_Institution :
Dept. of Microelectron., Fudan Univ., Shanghai, China
Abstract :
A noise-shaped synchronous buck converter using a 3rd-order continuous-time (CT) active-passive sigma-delta modulator (SDM) is presented. Detailed system modeling and loop design methodology for the SDM based DC-DC are discussed. The proposed circuit has been designed with Chartered 0.35 μm CMOS process. The system operates with a clock of 8 MHz. Compared with the traditional PWM mode converter, simulation results show that the proposed converter suppresses the switching tones by more than 25 dB over a wide frequency range with a peak efficiency of 96%.
Keywords :
CMOS integrated circuits; DC-DC power convertors; sigma-delta modulation; CMOS process; PWM mode converter; continuous-time active-passive sigma-delta modulator; frequency 8 MHz; noise-shaped buck DC-DC converter; Clocks; Converters; Frequency modulation; Pulse width modulation; Switches; Transfer functions; DC-DC; active-passive; buck converter; continuous-time; sigma-delta;
Conference_Titel :
Control and Modeling for Power Electronics (COMPEL), 2010 IEEE 12th Workshop on
Conference_Location :
Boulder, CO
Print_ISBN :
978-1-4244-7462-2
Electronic_ISBN :
978-1-4244-7461-5
DOI :
10.1109/COMPEL.2010.5562376
