Electronics > Beginners
OP AMP Spec - noise gain configuration??
Zero999:
In most low gain applications the extra noise isn't a big deal, since the signal is already quite strong anyway.
For completeness I've added the unity gain buffer, because it's something which isn't immediately obvious to most people. R2 is now the value of R2 and R3 in parallel 10|100k = 9k1, to the nearest E24 preferred number. One thing to be wary of is the impedance of V3, at high frequencies, can't approach R2. Ideally R2 and R1 should be much higher. Another option is to connect C1 to 0V, but then the circuit gain will rise above unity at higher frequencies, so a low pass filter would need to be added after V3, if that's a problem. That's not a problem, since the inverting input is still connected to the non-inverting, at high frequencies, via C1, irrespective of the impedance of V3.
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