Is the splitting of 1 signal to 2 op amps undersirable?

Discussion in 'The Projects Forum' started by scytheavatar, Nov 9, 2009.

  1. scytheavatar

    Thread Starter New Member

    Mar 2, 2009
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    0
    I have a problem: I need to design an amplifier system in which I need to switch to a lower gain when clipping occurs. So I am thinking of something like this:

    ---------->-------------> op amp A (large gain) --------> output A
    |
    |
    ---------------> op amp B (smaller gain) ---------> output B

    So that I can read output A when no clipping occurs and output B when clipping occurs. I am trying to avoid using variable gain op amps since I have no microcontroller at the moment in my design. My question is: is this design undesirable? Will this splitting of signals create noise?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    It should not present a problem if the input impedances of the op amps are high enough not to load the signal of interest.
     
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    OpAmps with high gain are usually not a good idea. Rather than have one opamp with a gain of 1000, it is better to have two, each with a gain of 31.6. Can you cascade the two amplifiers so that gain of the second doesn't have to be as high as if it amplified the original signal?
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Instead of switching between different opamp outputs it will be just as easy to switch the gain of a single opamp.
    Instead of switching can you use a compressor/limiter?
     
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