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A 50-mA 1-nF Low-Voltage Low-Dropout Voltage Regulator for SoC Applications
Gianluca Giustolisi,Gaetano Palumbo,Ester Spitale 한국전자통신연구원 2010 ETRI Journal Vol.32 No.4
In this paper, we present a low-voltage low-dropout voltage regulator (LDO) for a system-on-chip (SoC) application which, exploiting the multiplication of the Miller effect through the use of a current amplifier, is frequency compensated up to 1-nF capacitive load. The topology and the strategy adopted to design the LDO and the related compensation frequency network are described in detail. The LDO works with a supply voltage as low as 1.2 V and provides a maximum load current of 50 mA with a drop-out voltage of 200 mV: the total integrated compensation capacitance is about 40 pF. Measurement results as well as comparison with other SoC LDOs demonstrate the advantage of the proposed topology.
Pietro Matricardi,Giovanna Pitarresi,Fabio Salvatore Palumbo,Chiara Di Meo,Antonella Albanese,Tommasina Coviello,Claudia Cencetti,Calogero Fiorica,Gaetano Giammona 한국고분자학회 2011 Macromolecular Research Vol.19 No.12
The mechanical properties of hydrogel scaffolds based on hyaluronic acid (HA) that were chemically crosslinked with α,β-poly(N-2-hydroxyethyl)(2-aminoethylcarbamate)-D,L-aspartamide (PHEA-EDA) were investigated. Variation of these properties as a function of three different PHEA-EDA amounts used to crosslink HA has been related to the reaction efficiency evaluated using a colorimetric assay. Moreover, the amount of unreacted amino groups that was still present in the hydrogels was related to the attachment behavior of human dermal fibroblasts to the hydrogel surface. The mechanical data and biological results suggest the suitability of the investigated hydrogels as scaffolds for the regeneration of soft tissues such as skin.