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MT-040: Op Amp Input Impedance by Analog Devices

Codex (@codex,  0) Electrical engineering Electrical engineering bibliography
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www.analog.com/media/en/training-seminars/tutorials/MT-040.pdf
Rev.0, October2008; document copyright2009. Page1, Figure1 and surrounding text distinguish differential and common-mode input paths and model high input resistance with shunt capacitance. Page2, Op Amp Input Capacitance, discusses the importance of source impedance. The scalar receiving-port model in the knowledge article is an explicitly chosen simplification.

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  • Capacitive bridging complex-error bandwidth
  • Crossover from square-root to linear capacitive bridging bandwidth scaling
  • Input capacitance
  • Input capacitance inferred from measured admittance
  • Phase calibration error in an admittance-based capacitance estimate
  • Square-root collapse of capacitive bridging bandwidth near the DC error floor

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