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This article aims to present the design of a 4.5- V, 450-mA low drop-out (LDO) voltage linear regulator based on a two-stage cascoded operational transconductance amplifier (OTA) as error amplifier. The aforementioned two-stage OTA is designed with cascoded current mirroring technique to boost up the output impedance. The proposed OTA has a DC gain of 101 dB under no load condition. The designed reference...
Ultra low quiescent, wide output current range low-dropout regulators (LDO) are in high demand in portable applications to extend battery lives. This paper presents a 500 nA quiescent, 0 to 100 mA load, 3.5–7 V input to 3 V output LDO in a digital 0.35 μm 2P3M CMOS technology. The challenges in designing with nano-ampere of quiescent current are discussed, namely the leakage, the parasitics, and the...
This paper presents a low-dropout (LDO) linear regulator using ultra-low output resistance buffer for frequency compensation. The proposed buffer achieves ultra low output impedance with dual shunt feedback loops, which makes it possible to improve load and line regulations as well as the transient response for low voltage applications. A reference control scheme for programmable output voltage of...
A high-precision low-voltage low dropout regulator (LDR) using adaptive biasing to extend the loop bandwidth is proposed for system-on-chip power management applications. The multi-stage output-capacitor-free LDR is stabilized by miller compensation and Q-reduction technique to reduce the requirement of minimum load current. By using direct current feedback from a simple current mirror, the adaptively-biased...
Combining the supply ripple subtraction and high-pass filtering can improve the power supply rejection (PSR) over wideband frequency of low dropout regulator (LDO). The proposed LDO is fabricated by TSMC 0.35 ??m 2-poly 4-metal CMOS process. The simulation results at maximum load current of 100 mA, show that PSR at 10 k, 100 k and 1 M are -72 dB, -75 dB and -46 dB, respectively. Therefore, it's well...
Wirelessly powered implantable biomedical devices require a near-field inductive link to provide enough power for high current stimulation of large electrode-nerve impedances. In that situation, the induced voltage may be much larger than the compliance of low-voltage integrated circuits, especially during low-load conditions. In fact, most power recovery approaches limit the voltage with an inefficient...
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