⎯ An integrated voltage-mode boost converter that starts up at 0.9V is successfully implemented in a standard 3.3/5V 0.6μm CMOS process with V tn =0.7V and |V tp |=0.8V. The special features are: (1
) a near-threshold soft-start circuit that keeps maximum inrush current under control; (2) a slew rate enhanced error amplifier that achieves stable response over a wide range of supply voltage; and (3) a capacitor multiplier in implementing the compensation capacitor that reduces die area. Maximum efficiency of 93% is achieved at an output power of 260mW.
In this work, a detailed study on the surface recombination in InP/GaAsSb double heterojunction bipolar transistors (DHBTs) with an InP–InAlAs composite emitter was carried out. The experimental data clearly revealed that the surface recombination was effectively suppressed by using InP–InAlAs composite emitter in the devices. At a low collector current density JC, a reduction in the normalized emitter periphery surface recombination current KB_surf of by a factor of 50 was observed. The physical mechanisms responsible for the surface recombination in the InP/GaAsSb DHBTs with an InP–InAlAs composite emitter were examined by characterization of the temperature-dependent KB_surf. The results demonstrate the great potential for aggressive scaling of GaAsSb DHBTs by using an InP–InAlAs composite emitter configuration.
In this paper, we present an AC-boosting compensation topology with double pole-zero cancellation (ACBC-DPZ) for a multistage amplifier driving a very large capacitive load. The proposed technique modifies the original AC-boosting compensation (ACBC) topology to increase the power-bandwidth efficiency and reduce the size for the output power transistor and compensation capacitor. Simulation results show that the ACBC-DPZ amplifier using a CSM 0.18 µm CMOS process can achieve a unity gain bandwidth of 14 MHz and an average slew rate of 3.88 V/µs at 1500 pF load. The amplifier dissipates 2.55 mW at a 1.8 V supply.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.