IEEE Transactions on Biomedical Circuits and Systems · 2016 · 31 citations · 24 references
EngineeringBiomedical EngineeringElectrical EngineeringAnalog ElectronicsLow-power DesignMicroelectronicsAnalog Integrated CircuitsCmos Circuit DesignIntegrated Circuit DesignLow-noise Circuit DesignMixed-signal Integrated Circuit DesignSignal AmplificationCmos Analog Circuit DesignCmos Analog Integrated CircuitsDetector MiniaturizationInput ImpedanceInput Impedance AnalysisInput Impedance MatchingLow-noise AmplifiersPower Consumption
Within neural monitoring systems, the front-end amplifier forms the critical element for signal detection and pre-processing, which determines not only the fidelity of the biosignal, but also impacts power consumption and detector size. In this paper, a novel combined feedback loop-controlled approach is proposed to compensate for input leakage currents generated by low noise amplifiers when in integrated circuit form alongside signal leakage into the input bias network. This loop topology ensures the Front-End Amplifier (FEA) maintains a high input impedance across all manufacturing and operational variations. Measured results from a prototype manufactured on the AMS 0.35 [Formula: see text] CMOS technology is provided. This FEA consumes 3.1 [Formula: see text] in 0.042 [Formula: see text], achieves input impedance of 42 [Formula: see text], and 18.2 [Formula: see text] input-referred noise.
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