Thursday 28th of March 2024
 

Integrated Circuit of CMOS DC-DC Buck Converter with Differential Active Inductor


Kaoutar Elbakkar and Khadija Slaoui

In this paper, we propose a new design of DC-DC buck converter (BC), which the spiral inductor is replaced by a differential gyrator with capacitor load (gyrator-C) implemented in 0.18um CMOS process. The gyrator-C transforms the capacitor load (which is the parasitic capacitor of MOSFETS) to differential active inductor DAI. The low-Q value of DAI at switching frequency of converter (few hundred kHz) is boosted by adding a negative impedance converter (NIC). The transistor parameters of DAI and NIC can be properly chosen to achieve the desirable value of equivalent inductance L (few tens H), and the maximum-Q value at the switching frequency, and thus the efficiency of converter is improved. Experimental results show that the converter supplied with an input voltage of 1V, provides an output voltage of 0.74V and output ripple voltage of 10mV at 155 kHz and Q-value is maximum (#8776;4226) at this frequency.

Keywords: DC-DC Buck converter, gyrator-C, differential active inductor, negative impedance converter, quality factor, efficiency.

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ABOUT THE AUTHORS

Kaoutar Elbakkar
Department of physiqcs, University Sidi Mohamed Ben Abdellah, Fes.

Khadija Slaoui
Department of physiqcs, University Sidi Mohamed Ben Abdellah, Fes.


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