Assistance in analysing the frequency response of an inverting amplifier

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Discussion in 'The Projects Forum' started by c1rcu1ts, Mar 29, 2016.

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  1. Mar 29, 2016 #1
    c1rcu1ts

    Thread Starter Member

    Oct 19, 2013
    62
    0
    Hello all,

    I was simulating the AC analysis of a particular op amp known as the THS4505, according to the diagram below
    upload_2016-3-29_3-37-45.png

    From the analysis, i found a peak which occurred at approximately 10MHz

    upload_2016-3-29_3-38-20.png

    Can someone explain to me why this occurs or point me in a direction where i can find the answer?
     
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  2. Mar 29, 2016 #2
    crutschow

    Expert

    Mar 14, 2008
    19,830
    5,547
    The peak may be due to the input capacitance in the op amp model.
    Try reducing the resistors to about 2kΩ and see if the peak changes.
    Also look at the response when in a non-inverting follower configuration for comparison.
     
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