non-inverting mode Op Amp noise

Thread Starter

screen1988

Joined Mar 7, 2013
310
I am reading about non-inverting mode Op Amp.

Here is part that I am confused. Can you explain more?
On the other end of the spectrum,if the resistor values (RF, RG) are too high, there is an increase in noise and the susceptibility to parasitic capacitances, which can also limit bandwidth and possibly cause instability and oscillation
 

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crutschow

Joined Mar 14, 2008
34,281
Resistor thermal voltage noise is proportional to the resistance so high value resistors can have noise comparable to or larger than that of the op amp, which increases the total noise.

If the resistor values are high enough to be comparable to the reactive impedance of stray capacitance within the bandwidth of the op amp circuit, such as from the (-) input to ground, then peaking or instability in the response can occur.
 
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