# Q: Slew Rate of MCP601

I am using the MCP601 for rectification of small AC signals. I got it working.

simulate this circuit – Schematic created using CircuitLab

however at high frequencies (20kHz) weird behavior starts to surface such as this.

I understand is has something to do with the chip spending too long in saturation and can't catch up. I also heard that you can get a faster OP AMP in terms of slew rate and it would fix the problem as well.

But shouldn't this OP AMP Already be suitable as the Slew rate equation is $2*\pi*F$

if we do the math

$SR = 2*\pi * 20kHz$

$SR = 0.1256V/uS$ the op amp is stated for 2.3V/uS ?

Can anyone explain to me why is this is happening with this op amp? and why isnt the current slew rate satisfactory enough for this current application.

Eg. LMV2011 with slew rate of 4V/us but $t_{rec}$ recovery time from saturation of 50ms typical.