Title :
A low noise buck converter with a fully integrated continuous time ΣΔ modulated feedback controller
Author :
Wong, Marnie ; Bakkaloglu, Bertan ; Kiaei, Sayfe
Author_Institution :
Freescale Semicond., Tempe
Abstract :
A low noise synchronous buck converter with a fully integrated second order single-bit continuous time σ δ modulator (CT-ΣΔM) based controller is presented. The converter is designed and fabricated on a 0.18 μm SiGe process. The feedback CT-SigmaDeltaM is sampled at 10 MHz with a single-bit non-return-to-zero (NRZ) output. Compared to a traditional PWM controller, the CT-ΣΔM controlled converter shapes the out-of-band noise and suppresses the in-band noise at the switching node by 25 dB with 92% efficiency.
Keywords :
Ge-Si alloys; power convertors; spl sigma/-δ modulation; continuous time ΣΔ modulated feedback controller; frequency 10 MHz; low noise synchronous buck converter; size 0.18 μm; Adaptive control; Buck converters; Germanium silicon alloys; Noise shaping; Optical signal processing; Output feedback; Pulse width modulation; Pulse width modulation converters; Shape control; Silicon germanium;
Conference_Titel :
Custom Integrated Circuits Conference, 2007. CICC '07. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-0786-6
Electronic_ISBN :
978-1-4244-1623-3
DOI :
10.1109/CICC.2007.4405756
