= MT-040: Op Amp Input Impedance by Analog Devices
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https://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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