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| Title: | A high slew-rate push–pull output amplifier for low-quiescent current low-dropout regulators with transient-response improvement |
| Authors: | Man, Tsz Yin
Mok, Philip
Chan, Mansun |
| Keywords: | CMOS integrated circuits
Differential amplifiers
Compensation capcitors
Low-dropout regulators
Low-quiescent current |
| Issue Date: | 2007 |
| Citation: | IEEE transactions on circuits and systems II : express briefs, v. 54, no. 9, September 2007, p. 755-759 |
| Abstract: | A high slew-rate amplifier with push-pull output driving capability is proposed to enable an ultra-low quiescent current (IQ ~ 1μA) low-dropout (LDO) regulator with improved transient responses. The proposed amplifier eliminates the tradeoff between small IQ and large slew-rate that is imposed by the tail-current in conventional amplifier design. Push-pull output stage is introduced to enhance the output driving ability. Small dropout voltage (VDO) with large-size pass transistor and ultra-low IQ can thus be used to minimize power loss of LDO regulator without transient-response degradation. The proposed amplifier helps to improve stability of LDO regulators without using any on-chip and off-chip compensation capacitors. This is beneficial to chip-level power management requiring high-area efficiency. An LDO regulator with the proposed amplifier has been implemented in a 0.18- μm standard CMOS process and occupies 0.09 mm2. The LDO regulator can deliver 50-mA load current at 1-V input and ~ 100-mV VDO. It only consumes 1.2 μA IQ and is able to recover within ~ 4 μs even under the worst case scenario. |
| Rights: | © 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| URI: | http://hdl.handle.net/1783.1/3262 |
| Appears in Collections: | ECE Journal/Magazine Articles
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