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opamp high input impedance

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nandasit

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why op-amp (High input impedance) is considered while designing?
 

kspalla said:
the idea is not to load the input signal strength/voltage.

More than that!

Only in this case the opamp can be considered to function as a VCVS and - as a consequence - the known set of simple equations is applicable to calculate the gain with feedback.
 

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