Operational Amplifier Slew Rate | Op Amp Slew Rate

The slew rate of an operational amplifier or op amp is particularly important. If the circuit is to perform correctly, then the slew rate for the amplifier must not be exceeded.
Operational amplifier slew rate is a specification that is seen in virtually all op amp data sheets. It is the maximum voltage change that the amplifier can provide at its output. Typically it is measured in volts per microsecond, although some very fast amplifiers may have specifications measured in volts per picosecond.
The slew rate of an operational amplifier is limited by a number of factors, however the main one is results from the use of frequency compensation circuitry within the op-amp itself. The internal circuits can only provide a certain amount of current to change the voltage at this point and therefore the rate of voltage change is limited.
The slew rate limitations can cause the output waveform to be distorted if the maximum rate of change is exceeded. A square wave may have its sides skewed, and a sine wave can become distorted - in the limiting case it can even look more like a triangular wave as a result of slew rate.
When designing a circuit, it is essential that the maximum slew rate specification is not exceeded. This can be done by looking at the signal frequency components and their peak voltages. The slew rate required can be calculated from the formula 2 pi f V.
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