Abstract
In this paper, output capacitor-less low-dropout (LDO) regulator using active-feedback and current-reuse feedforward compensation (AFCFC) is presented. The open-loop transfer function was obtained using small-signal modeling. The stability of the proposed LDO was analyzed using pole-zero plots, and it was confirmed by simulations that the stability was ensured under the load current of 50 mA. The proposed compensation method increases gain-bandwidth product (GBW) and reduces the on-chip compensation capacitor. The proposed AFCFC technique was applied to a three-stage output capacitor-less LDO. The LDO has a GBW of 5.6 MHz with a small on-chip capacitor of 2.6 pF. Fast-transient time of 450 ns with low quiescent current of 65.8 μA was achieved. The LDO was fabricated in 130 nm CMOS process consuming 180 × 140 μm2 of the silicon area.
Highlights
The LDO was fabricated in 130 nm CMOS process consuming 180 × 140 μm2 of the silicon area
Development of miniature wireless communication chip has led to great development of mobile devices and internet of things (IoT) devices
Multi-stage amplifiers which are more than two-stages should be frequency compensated and various frequency compensation designing multi-stage amplifiers have been studied as whichmethods are morefor than two-stages should be frequency compensated and various frequency compensation methods for designing multi-stage amplifiers have been studied as shown in Miller compensation (NMC)
Summary
Development of miniature wireless communication chip has led to great development of mobile devices and internet of things (IoT) devices. The main design issues of the OCL-LDO are to increase power conversion efficiency, minimize dropout voltage, and reduce quiescent current without decreasing transient performance. For a heavy load current, a large pass transistor seems to be suitable for power efficiency by reducing dropout voltage. 2018, 11, 688 the parasitic capacitor of a large pass transistor can degrade the phase dropout voltage. The parasitic capacitor of a the large pass resistance transistor can degrade the phase margin significantly. Low quiescent current increases output of the LDO under light margin significantly. Integrated circuit (PMIC) with output capacitor-less low dropout regulator (OCL-LDO) scheme. In order to achieve high loop gain and excellent voltage regulation performance, usually a two-stage error amplifier is adopted. Since the power transistor is a common source amplifier for a small signal, to control output current.
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