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→Applications without using negative feedback: introduce link to voltage comparator, and clarify that positive feedback may still be used, but with side-effects in level detection |
→Non-inverting amplifier: a lot of detail missing for anyone attempting to design a real amplifier - beyond scope here to provide it all, but R at non-inverting input needs a mention. Mark. |
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Line 296:
= V_{\text{in}} (1 + \frac{R_2}{R_1})
</math>.
Note that the non-inverting input of the operational amplifier will need a path for DC to ground; if the signal source might not give this, or if that source requires a given load impedance, the circuit will require another resistor - from input to ground. In either case, the ideal value for the feedback resistors (to give minimum offset voltage) will be such that the two resistances in parallel roughly equal the resistance to ground at the non-inverting input pin.
==== Inverting amplifier ====
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