|GCSE Op Amp Amplifier System Comparator Gain Gain Bandwidth >Inverting< Non-Inverting Power Summing|
Op Amp Inverting
Gain = - Rf / R1 = Vout / Vin Input Impedance = R1 The output is 1) bigger and 2) inverted.
Inverting Amplifier in the Lushprojects Simulator
Feedback is the signal from the Op Amp output, fed back to the input, through Rf. The inverting amplifier uses negative feedback to control the gain.
Ohm's Law can be used to predict the gain of the Inverting Op Amp.
No current flows into or out of ideal Op Amp inputs. Therefore the current in Rf is equal to the current in R1. Using Ohm's law (V = I R) and since the voltage at P is zero ...
Vin = -I R1 so I = - Vin / R1
Vout = I Rf so I = Vout / Rf
- Vin / R1 = Vout / Rf
Gain = Vout / Vin = - Rf / R1
Build this inverting amplifier and measure the gain. The volt meters should be set to the 20 Volt range.
Plot a graph showing Vin on the X axis and Vout on the Y axis. The graph gradient gives you the gain.
Gain = -Rf / R1 = - 100/10 = -10.
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