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Output–Capacitorless CMOS LDO Regulator Based on High Slew–rate current-mode transconductance amplifier

機(jī)譯:基于高擺率電流模式跨導(dǎo)放大器的輸出電容無CmOs CmOs LDO穩(wěn)壓器

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摘要

A low quiescent current output-capacitorless CMOS LDO regulator based on a high slew-rate current-mode transconductance amplifier (CTA) as an error amplifier is presented. Load transient characteristic of the proposed LDO is improved even at low quiescent currents, by using a local common-mode feedback (LCMFB) in the proposed CTA. This provides an increase in the order of transfer characteristic of the circuit, thereby enhancing the slew-rate at the gate of pass transistor. The proposed CTA-based LDO topology has been designed and post-layout simulated in HSPICE, in a 0.18 μm CMOS process to supply a load current between 0-100 mA. Postlayout simulation results reveal that the proposed LDO is stable without any internal compensation strategy and with on-chip output capacitor or lumped parasitic capacitances at the output node between 10-100 pF.
機(jī)譯:提出了一種基于高轉(zhuǎn)換速率電流模式跨導(dǎo)放大器(CTA)作為誤差放大器的低靜態(tài)電流無輸出電容器CMOS LDO穩(wěn)壓器。通過在建議的CTA中使用本地共模反饋(LCMFB),即使在低靜態(tài)電流下,也可以改善建議的LDO的負(fù)載瞬態(tài)特性。這增加了電路的傳輸特性的順序,從而提高了傳輸晶體管柵極的壓擺率。已設(shè)計出基于CTA的LDO拓?fù)洌⒃贖SPICE中以0.18 μm CMOS工藝對后布局進(jìn)行了仿真,以提供0-100 mA之間的負(fù)載電流。布局后的仿真結(jié)果表明,所提出的LDO是穩(wěn)定的,沒有任何內(nèi)部補(bǔ)償策略,并且在輸出節(jié)點上具有片上輸出電容器或集總寄生電容在10-100 pF之間。

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