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This letter presents an upgraded winner‐take‐all (WTA) circuit that is capable of operating under low‐voltage supplies. The proposed circuit re‐configures the basic loop of a conventional WTA through an auxiliary transistor to decrease the dropped voltage across the tail current. This reconfiguration creates an additional biasing voltage providing more adjustability. Moreover, the new feedback path decreases the delay compared to the conventional WTA. Both conventional and proposed WTAs were fabricated in the TSMC 0.18 μm CMOS technology. The experimental results show a 29.4 and 33.2 μs reduction in rising and falling times, respectively, for the proposed WTA under a supply voltage of 0.3 V. [ABSTRACT FROM AUTHOR]

Summary: This paper presents an energy‐efficient switching scheme for successive approximation register (SAR) analogue‐to‐digital converter (ADC). The proposed scheme employs charge recycling method to keep the capacitor arrays free of transitional energy between bit generations except reset phase. In comparison with the conventional switching scheme, the proposed one achieves 100% transitional energy saving without considering reset phase. In addition, configuration of a 10‐bit SAR ADC shows that the proposed switching scheme reduces the capacitor area by 25% compared with the conventional switching scheme. [ABSTRACT FROM AUTHOR]

This paper presents a two-stage bulk-driven operational transconductance amplifier operating in weak-inversion region. The proposed amplifier is upgraded using recycling structure, current shunt technique, positive feedback source degeneration and indirect frequency compensation feedback to enhance transconductance under a reasonable stability. Combining these approaches leads to an ultra-low-power high performance amplifier without increasing power dissipation compared to the conventional one. Simulation results in 0.13-µm complementary metal-oxide-semiconductor technology show the proposed structure achieves a 63-dB DC gain at 0.25-V supply voltage with just 20-nW power dissipation. Copyright © 2016 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]