An Adaptive Voltage Scaling Buck Converter with Preset Circuit

• Published in: Chinese Journal of Electronics Vol. 28; no. 2; pp. 229 - 236
• Main Authors: Luo, Ping, Wang, Dongjun, Peng, Xuanlin
• Format: Journal Article
• Language: English
• Published: Published by the IET on behalf of the CIE 01.03.2019
• Subjects: Adaptive voltage scaling (AVS); adaptive voltage scaling buck converter; CMOS integrated circuits; Coarse scaling loop; Fast response; Fine scaling loop; frequency 2.0 MHz; frequency 30.0 MHz to 120.0 MHz; preset block; preset circuit; pulse width modulation; PWM power convertors; PWM regulator; P‐AVS; P‐AVS buck converter; reference voltage; size 0.13 mum; standard CMOS process; typical AVS buck; voltage 0.7 V to 1.5 V; voltage 3.3 V; voltage scaling loop; voltage scaling loop; typical AVS buck; PWM power convertors; reference voltage; voltage 3.3 V; PWM regulator; preset circuit; frequency 2.0 MHz; Fast response; preset block; pulse width modulation; size 0.13 mum; coarse scaling loop; standard CMOS process; adaptive voltage scaling buck converter; Adaptive voltage scaling (AVS); voltage 0.7 V to 1.5 V; CMOS integrated circuits; P-AVS buck converter; frequency 30.0 MHz to 120.0 MHz; fine scaling loop; P-AVS
• DOI: 10.1049/cje.2019.01.007
• ISSN: 1022-4653

An Adaptive voltage scaling (AVS) buck converter with Preset circuit (P-AVS), which can adaptively scale the output voltage fast, is presented. The voltage scaling loop in the proposed Pulse width modulation (PWM) buck with P-AVS is divided into coarse scaling loop and fine scaling loop, which can regulate the reference voltage adaptively according to load status. The coarse scaling loop can set quickly a coarse value of reference voltage according to the operation frequency of the load by a preset block, and the fine scaling loop is designed to scale voltage finely. The proposed P-AVS buck converter, with 3.3V input and 2MHz switching frequency, is fabricated in a 0.13mm standard CMOS process. The output voltage and the frequency of the load are designed from 0.7V to 1.5V and 30MHz to 120MHz respectively. Compared with a typical AVS buck, the proposed P-AVS converter can save 17ms scaling up from 0.7V to 1.1V.