Can you compare the input resistances for inverting and non-inverting amplifers?
- StevenLv 71 month ago
We might assume you are talking about classic single OP-AMP circuits but you didn't say that. The input of an inverting op-amp circuit is one side of the feedback network so the input impedance is limited by that network. The positive input can be nothing but a FET gate impedance which is almost an open circuit. But it is not difficult for other circuits to feature negative inputs with extremely high input impedance. A single transistor common emitter/source amplifier is an inverting amplifier.
- PhilomelLv 71 month ago
The input impedance of an Op amp is very High, Usually several Meg Ohms. They are the bases of a differential pair of transistors or FET's.
If you look up the data sheet of the OpAmp it will tell you the Impedance.
Inverting and non inverting are the same op amp just wired differently, therefore dependent on the circuit wiring.
- qrkLv 71 month ago
You can, but that's probably not the answer you are seeking.
Post a schematic of what you are asking about as an "amplifier" can have many forms.
- derframLv 71 month ago
Sure you can compare them, you can compare just about any two objects/items. If you are referring to common op-amp circuits in the inverting and non-inverting configurations, then in general the non-inverting amp has a very high input impedance and the inverting amp has an input impedance equal to the input series resistor.
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- Lee26Caloo秦君子蘭Lv 71 month ago
Both are close to same.
- daniel gLv 71 month ago
In determining which is which, it doesn't work. Input impedance is generally the same for any differential amp
- DixonLv 71 month ago
You can compare the Taj Mahal with a banana
- Markus ImhofLv 71 month ago
But for any practical approach, in either case the input resistance is either high enough not to matter, or you need to quantify the specific circuit and all the components used.