IEEE Transactions on Circuits and Systems I Regular Papers · 2014 · 27 citations · 29 references
EngineeringBiomedical EngineeringElectrical EngineeringAnalog ElectronicsLow-power DesignSystem-on-chip DesignCmos Circuit DesignImplantable Biomedical DevicesImplantable MicrosystemsIntegrated Circuit DesignMixed-signal Integrated Circuit DesignPower ManagementCmos Analog Circuit DesignCmos Analog Integrated CircuitsHarmonic DistortionLow-dropout Regulator DesignLow-dropout RegulatorsPower ConsumptionSwitching FunctionsTotal Harmonic Distortion
Multiple-supply are required to minimize the power consumptions in bio-implant systems. A single-inductor multiple-output (SIMO) switching converter is one of the solutions. But it has inherent problems which block the applications in the embedded biomedical systems. In this paper, a circuit arrangement for providing multiple outputs based on low-dropout (LDO) regulator is proposed. The regulating transistor of LDO is time-shared by N output legs. Two error amplifiers (EAs) are utilized in the topology, irrespective of number of the output legs. The corresponding switching strategy alleviates the difficulties associated with controlling multiple switching functions for conventional time-sharing methods, and thus, permits multiple outputs to be generated easily. A prototype multiple-output LDO (MOLDO) regulator with four output legs was fabricated with a standard 0.35 μm CMOS process. The measurement results verify the good performance of this design such as no cross regulation (CR), small ripples, and less power consumption. Moreover, it does not require inductor and presents low total harmonic distortion, which is very suitable for bio-implant fields.
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