The schematics a little bit differs from the schematic in the question Use of 100K ohm resistor along with 0.1uF capacitor? UPD: Added the schematic to avoid misunderstood. Other people say it doesn't need for the input to have this path. They say in case there is no path to ground and the non-inverting pin 'hang in the air' for some unwanted unexpected reasons, the op-amp may go into saturation or something like this. Some people say the input does need to have DC path to ground. Then, it says about a consequence of making this path such as bias current which produce extra input offset voltage and so on. That ideal value assumes the bias currents are well-matched, which may not be true for all op-amps.ДЄs far as I've concerned, it says just like it really must have this path in case the signal source does not supply a DC path. 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. When the operational amplifier's input bias currents are significant, then the DC source resistances driving the inputs should be balanced. The non-inverting input of the operational amplifier needs a path for DC to ground if the signal source does not supply a DC path, or if that source requires a given load impedance, then the circuit will require another resistor from the non-inverting input to ground. Wikipedia says that, but doesn't give any explanations.

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