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Varying input impedance of AD8251

Question asked by prb Employee on Jan 11, 2011
Latest reply on Jan 11, 2011 by prb

I am using an AD8251 to measure the amplitude of an AC signal across a sense resistor.  The input impedance of the AD8251 is in parallel with my sense resistor.  Under normal operation, the circuit works great, but when I use large amplitude or high frequency signals, the AD8251 input impedance seems to change.  Is this possible?