eetop.cn_T1 - Low-Noise Current Sensing.pdf

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1、 2025 IEEE International Solid-State Circuits ConferenceLow-noise current sensingJens Anders(jens.andersiis.uni-stuttgart.de)University of StuttgartFebruary 16,2025ISSCC 2025 Tutorial T1“Low-noise current sensing”Jens Anders1 of 88 2025 IEEE International Solid-State Circuits ConferenceOutlineMotiva

2、tion:Applications of low-noise current interface circuitsRequirements for current sensor interfacesFundamentals of current-to-voltage conversionReview of basic feedback theory including basic TIAsResistive TIAs and noise theoryDesign of TIAs with capacitive feedbackCurrent-input modulatorsAlternativ

3、e approaches:Current-to-X conversionSummary and conclusionJens Anders2 of 88ISSCC 2025 Tutorial T1“Low-noise current sensing”2025 IEEE International Solid-State Circuits ConferenceBiomedical sensing I Nanopore sensingNanopore sensing is used to analyze and characterize molecules by detecting them as

4、 they pass through a tiny pore,called a nanoporeThe nanopore is embedded in a thin membrane separatingtwo compartments filled with an electrolyte solutionAn applied voltage across themembrane drives and ionic current through the nanoporeThe molecule passing the pore alters the ionic currentChallenge

5、:Depending on the pore type need to detect current changes in the pA range for large channel countsJens Anders3 of 88ISSCC 2025 Tutorial T1“Low-noise current sensing”Reference 1 2025 IEEE International Solid-State Circuits ConferenceBiomedical sensing II Injectable sensorsInjectable,wirelessly power

6、ed CMOS chips for in-vivo electrochemistry measurements open up new ways formonitoring and diagnosticsChallenges:Small area,low power consumptionJens Anders4 of 88ISSCC 2025 Tutorial T1“Low-noise current sensing”Reference 2 2025 IEEE International Solid-State Circuits ConferenceNanochemistryMeasurin