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Homework Help: Quick question about operational amplifiers

  1. Mar 23, 2014 #1
    1. The problem statement, all variables and given/known data
    Does a noninverting operational amplifier amplify the frequency of an input, ex. a 2 kHz square wave of amplitude 100mV peak-peak, or just the voltage?
  2. jcsd
  3. Mar 23, 2014 #2


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    Staff: Mentor

    Welcome to the PF.

    In general, opamps are voltage amplifiers. You use negative feedback to set the overall gain of the circuit. If you use reactive components (caps and/or inductors), you can make the gain a function of frequency. That is how you make lowpass filters (LPFs), highpass filters (HPFs), bandpass filters (BPFs), etc.

    Does that help?
  4. Mar 23, 2014 #3
    Yea, I just needed a confirmation. Been doing DC circuits in my circuit class, and then I come across questions concerning AC inputs and wasn't sure about the frequency. Thanks for the quick reply :)
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