摘要
针对现代处理器低压大电流电源模块中用有源下调电压控制(Active Droop Control)实现自适应电压定位(AVP:Adaptive Voltage Position)的需要,提出了一种误差放大器(EA)的设计。通过对运算放大器结构的改进,利用增设的输入端建立反应负载电流变化的动态基准,方便地实现了输出电压随负载的变化,即下调电压控制。SpectreS仿真结果表明,该放大器除具有上述特点外,亦能很好满足PWM控制器中运放的低失调、高增益带宽要求。该误差放大器配合相应的电流检测放大器(CSA),已用于一款多相同步Buck控制器芯片的设计,并在1.5μm BCD工艺下实现。系统仿真结果显示,芯片性能符合设计要求,已成功实现有源下调电压控制。
To meet the requirements of adaptive voltage position （AVP） with active droop control method in lowvoltage high-current voltage regulator modules （VRM） of modern microprocessor, a novel error amplifier （EA） was proposed. By improving the structure of op-amps and introducing a differential feedback signal of load current into the additional input terminals, a dynamic reference was established to adjust the output voltage as a function of the load current to realize droop control. SpectreS simulation indicates that the EA has very low offset and high gain bandwidth needed for PWM controllers. The device was used in a multiphase synchronous buck converter implemented in 1.5 μm BCD technology. System simulation shows that all anticipated features were realized and precise active droop control has been achieved.
出处
《微电子学》
CAS
CSCD
北大核心
2007年第3期394-398,共5页
Microelectronics
基金
国家自然科学基金资助项目(50237030)
浙江省自然科学基金资助项目(Z1014441)
