提出一种新的低功耗开关电容电路设计方法.新的电路结构充分利用开关电容电路的工作特点,同时采用ACP交流电源对电路进行供电.当电路工作在采样相位阶段时,关闭OTA放大器电源以达到降低电路功耗的目的.电路仿真基于CSMC 5V 0.6μm CMOS工艺,与传统的采用DCP直流电源供电的开关电容电路相比,新的ACPSC低功耗开关电容电路可以取得降低40%电路功耗的效果.ACPSC电路技术经过流片测试,验证了电路功能的有效性.
A novel design method for low power switched-capacitor (SC) circuits is presented. The new SC circuits retain the best characteristics of switched-capacitor circuits and can be directly powered by an AC power supply. The power consuming OTA is powered off during the sampling phase. Compared with traditional direct-current-powered SC (DCPSC) circuits,ACpowered SC(ACPSC) circuits achieve a power saving ratio of up to 40% without obvious damage to the settling behavior,as simulated with CSMC 5V 0.6vim technology. The functionality of ACPSC circuits is also proven by fabricated chips.