摘要
在开关电容(SC)放大器中,由于MOS开关导通电阻的存在,会对其建立速度产生影响.首先使用跨导运算放大器的一阶线性模型推导了包含开关导通电阻的开关电容放大器的闭环传输函数,通过分析极点和零点的分布,研究了放大器中不同位置开关的导通电阻对阶跃响应的影响.进而提出了一种MOS开关的优化设计方法来缩短放大器阶跃响应的建立时间.最后使用电路仿真工具验证了该方法的有效性.
The settling speed of switched-capacitor (SC) Amplifier is affected by the resistances of MOS switches. The closed loop transfer function of SC Amplifier with switch resistances is deduced using one-pole linear model of OTA. By analyzing the positions of poles and zeroes, the effects of switch resistances in two positions on step response are researched. An optimization method of MOS switches in practical design is proposed to decrease the settling time of SC Amplifier' step response. This method is verified by the simulation results.
出处
《微电子学与计算机》
CSCD
北大核心
2010年第4期25-28,共4页
Microelectronics & Computer
基金
国家"八六三"计划项目(2007AA01Z2a8)