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Dive into the research topics where Cristiano Bazzani is active.

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Featured researches published by Cristiano Bazzani.


IEEE Transactions on Power Electronics | 2014

A 0.18-µm CMOS, 91%-Efficiency, 2-A Scalable Buck-Boost DC–DC Converter for LED Drivers

Piero Malcovati; Massimiliano Belloni; Fabio Gozzini; Cristiano Bazzani; A. Baschirotto

This paper presents a buck-boost dc-dc converter for LED drivers capable of delivering an output current ranging from 0.1 to 2 A and a variable output voltage ranging between 2 and 5 V, starting from an input voltage spanning from 2.7 to 5.5 V. The dc-dc converter, realized in a 0.18-μm CMOS technology with 5-V option, occupies an area of 4 mm2 including pads. The circuit features automatic mode switching and dynamic sizing of the power transistors to achieve a peak efficiency of 91%. With a switching frequency of 2.5 MHz, the achieved line regulation is lower than 0.1% V-1 and the output voltage ripple is less than 10 mV. The obtained turn-on and load transient settling time are lower than 40 μs, thus allowing pulsed operation of the LEDs, as well as switching among LEDs of different colors.


international solid-state circuits conference | 2012

A 0.18μm CMOS 91%-efficiency 0.1-to-2A scalable buck-boost DC-DC converter for LED drivers

Piero Malcovati; Massimiliano Belloni; Fabio Gozzini; Cristiano Bazzani; A. Baschirotto

Several emerging portable applications require high-efficiency LED drivers [1-4]. An LED driver is basically a current source that forces the current required for achieving the desired light emission into the LED. In order to increase the LED driver efficiency, besides controlling the LED current, it is necessary to regulate the voltage applied to the LED itself, to minimize the voltage drop across the driver current source and, hence, the power consumption. Depending on the kind of LED and on the current forced through the LED itself (0.1 to 2A in this design) and, hence, on the desired light emission, the voltage required to drive the LED, while maintaining the voltage headroom across the driver current source to the minimum, varies over a wide range (0 to 5V). Starting from a standard voltage supply in the range 2.7 to 5.5V, a buck-boost DC-DC converter is then required (Fig. 16.4.1). The buck-boost DC-DC converter includes the LED in the control feedback loop and has to provide fast turn-on and load transients (on the order of 20μs), in order to allow pulsed operation of the LED itself.


Archive | 2007

Bias circuit for Burst-Mode/TDM systems with power save feature

Quazi Ikram; Cristiano Bazzani; Daniel Draper; Maurice M. Reintjes


Archive | 2009

Reducing power dissipation in portable LCOS/LCD/DLP portable projection systems

Cristiano Bazzani; Daniel Draper


Archive | 2008

Method and apparatus for reducing optical signal speckle

Cristiano Bazzani; Daniel Draper; Kevin B. Mcdonald


Archive | 2012

HIGH ACCURACY, HIGH DYNAMIC RANGE LED/LASER DRIVER

Cristiano Bazzani; Fabio Gozzini; Tao Chen


Archive | 2012

Scalable buck-boost DC-DC converter

Massimiliano Belloni; Piero Malcovati; A. Baschirotto; Cristiano Bazzani


Archive | 2007

Driving laser diodes with immunity to temperature changes, aging, and other effects

Christophe Neron; Cristiano Bazzani; Dario Soltesz; Ramakrishna Shivaram


Archive | 2006

Trans-impedance amplifier with offset current

Dario Soltesz; Cristiano Bazzani; Wim F. Cops


Archive | 2013

Automatic buck/boost mode selection system for dc-dc converter

Cristiano Bazzani; Fabio Gozzini

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Fabio Gozzini

Polytechnic University of Milan

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A. Baschirotto

University of Milano-Bicocca

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