Increasing the bandwidth of a high gain amplifier

Discussion in 'General Electronics Chat' started by huntlk, May 15, 2010.

  1. huntlk

    Thread Starter New Member

    Feb 19, 2010
    12
    0
    Is it possible to increase the bandwidth of a high-gain amplifier by using tow lower gain amplifiers?
     
  2. bertus

    Administrator

    Apr 5, 2008
    19,575
    3,995
    Hello,

    What amplifiers did you have in mind?
    Transistor or opamp?

    Can you post a schematic of what you have upto now?

    Bertus
     
  3. Jaguarjoe

    Active Member

    Apr 7, 2010
    767
    90
    Take the square root of the gain of the amplifier you have now. Use the resulting value as the gains for the two new amplifiers.
     
  4. russ_hensel

    AAC Fanatic!

    Jan 11, 2009
    825
    57
    For op amp types the gain bandwidth product is quite close to a constant for any given op amp. See the spec sheet for this number.
     
  5. Audioguru

    Expert

    Dec 20, 2007
    11,100
    1,293
    A TL071 opamp has its frequency response drop above 3.1kHz when its gain is 1000.
    If two are used, each with a gain of only 31.6 (but then their total gain is 1000), their frequency response drops above 50kHz.
     
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