I found the circuit's slew rate as 14.7V / us.Slew rate value of the integrated I will use is 700V / us.(OPA657).Is it a problem if the Op Amp slew rate is higher than the slew rate in the circuit?
Not at all. It's a problem if the op amp's maximum available slew rate is lower than the slew rate your circuit needs, because that situation will cause distortion and/or clipping of the op amp's output signal.I found the circuit's slew rate as 14.7V / us.Slew rate value of the integrated I will use is 700V / us.(OPA657).Is it a problem if the Op Amp slew rate is higher than the slew rate in the circuit?
It isn't a problem, but it'll likely raise some eyebrows if someone analyzes your circuit.I found the circuit's slew rate as 14.7V / us.Slew rate value of the integrated I will use is 700V / us.(OPA657).Is it a problem if the Op Amp slew rate is higher than the slew rate in the circuit?
That's a good point. With its GBW product of 1.6 GHz and maximum slew rate of 700 V/μs, the OPA657 is much, MUCH faster than appears to be needed here. There's nothing wrong with that per se, but extreme wideband op amps can be very difficult to work with due to their ability to oscillate at VHF (or even UHF) frequencies if given the slightest excuse-- such as poor PCB layout, improper supply decoupling, unwanted crosstalk between signals, etc.It isn't a problem, but it'll likely raise some eyebrows if someone analyzes your circuit.
by Aaron Carman
by Jake Hertz
by Aaron Carman