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An auto‐buck–boost single‐inductor multiple‐output (SIMO) dc–dc converter with duty‐cycle‐constrained comparator control is presented in this Letter. Combined both comparator‐based and duty‐cycle‐constrained controllers enable the dc–dc converter attaining fast transient response and low cross‐regulation (CR). The proposed algorithm is independent of the precision of current sensor and suppresses CR robustly with the proposed tri‐feedback loop control of comparator‐based voltage control, duty‐cycle‐constrained distribution and average current control. The proposed scheme is suitable for auto‐buck–boost SIMO dc–dc converter design for dynamic voltage scaling applications. [ABSTRACT FROM AUTHOR]

A sense‐FET‐based inductor current sensor for a buck converter operating in 10 MHz switching frequency is reported in this Letter. The proposed sensor utilises an adaptive gm‐boosting amplifier to maintain stable current sensing loop gain and bandwidth over a wide range of load current. Moreover, a mirrored source‐degeneration output stage is introduced to further eliminate the bandwidth variation by loading change and achieves full‐wave current sensing with smooth transition between the sensed peak and valley currents as the inductor is energised and de‐energised. Simulation results show high sensing accuracy better than 96.8% with inductor current varying from 200 mA to 2 A. Furthermore, the settling time is <6 ns during the state transition between peak and valley current sensing with low‐voltage spikes. [ABSTRACT FROM AUTHOR]

A simple and effective technique is presented to reduce the limit‐cycle oscillation (LCO) in the reconfigurable rectifier for wireless power receiver. It is theoretically analysed that only one switching edge of the switching signal is needed to be synchronised and a phase‐shift circuit is proposed for synchronisation. Simulation results in commercial 0.18 µm CMOS technology show that the LCO is greatly suppressed with the proposed synchronisation circuit and the output voltage ripples are much smaller compared to the conventional circuit. [ABSTRACT FROM AUTHOR]