Akademik Veri Yönetim Sistemi
AEU - International Journal of Electronics and Communications, cilt.115, 2020 (SCI-Expanded, Scopus)
This paper presents a novel control technique to efficiently supply a wide range of output load current in a buck converter using an adaptive pass device at the output stage. The adaptive pass device segment size control technique is based on equalization of capacitive power loss and resistive power loss terms by taking into account load current, input supply voltage, temperature, process, and aging conditions; thus, leading to optimum efficiency at the output stage in a broad operating region. Power calculations are done in analog domain using a novel arithmetic cell called the adaptive gm stage. The additional power consumption introduced by the power calculation blocks is less than 1.4 μA, which enables high efficiency operation even in low load currents. The circuit and layout are designed in a standard 130 nm CMOS technology and simulation results show 5–35% efficiency increase for mid/low load currents compared to a fixed output stage buck converter. Compared to other reported adaptive pass device buck converters, 4% increase in peak power efficiency with 3× broader load current range has been achieved.