Nov 13, 2018 · Because the op amp terminals are open circuit (or, at least, we are pretending they are) you know the current through R1 must also be the current through R2. So we know the voltage across R2 which ...
Because an infinite input impedance would be desired if possible. This is because no current would flow into (or out of) the input of the amplifier, no voltage would be dropped across the internal impedance of the signal source and the whole voltage provided by the signal source would appear at the amplifier's input and thus a higher output voltage would be got.
because the gain is infinite and output voltage is at finite level: Uout = Uin x Gain = 0 x ∞ = finite voltage. This basic idea (input voltage at zero) simplifies the OPAMP usage in real applications. Real operational amplifier requires properties close to ideal requirements: • High amplification gain (open loop) – for example: gain ...
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Nov 13, 2018 · Because the op amp terminals are open circuit (or, at least, we are pretending they are) you know the current through R1 must also be the current through R2. So we know the voltage across R2 which ...