A 3.6-to-1.8-V Cascode Buck Converter With a Stacked LC Filter in 65-nm CMOS

作者：Ostman Kim B^*; Jarvenhaara Jani K; Broussev Svetozar S; Viitaniemi Ismo

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2014, 61(4): 234-238.

DOI：10.1109/TCSII.2014.2304875

• Buck
• cascode
• circuit optimization
• component stacking
• dc-dc
• device design
• high Q
• power supply on chip

This brief presents the analysis, design, and measurements of an integrated synchronous cascode dc-dc buck converter in 65-nm CMOS. Guidelines for optimal design of each thick-oxide device in the switch bridge are derived in order to obtain enhanced power efficiency. The form factor is improved by stacking the high-Q inductor and other converter components. The circuit shows a measured efficiency of 67.9% when converting 3.6 to 1.8 V at a switching frequency of 120 MHz and a load current of 140 mA. The efficiency enhancement factor of +26.4% is among the highest for integrated buck converters.

• 出版日期2014-4