Variable Gain, High Bandwidth Amplifier

Discussion in 'The Projects Forum' started by Enforcer83, Dec 5, 2014.

  1. Enforcer83

    Thread Starter Member

    Oct 29, 2010
    25
    0
    I am attempting to design an amplifier system with a variable gain between 1 and 100 and a -3dB bandwidth of 100MHz (min). I intend on using multiplexers for the switching mechanism. Based on my research, I have decided to use a setup similar to an Instrumentation Amplifier setup. I also want to limit the number of amplification stages to 3.

    I understand how to design the system as shown at http://en.wikipedia.org/wiki/File:Op-Amp_Instrumentation_Amplifier.svg, however, I am having trouble finding the right amplifier(s) to accomplish my goals.

    Does anyone have any suggestions?
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    100 mhz bandwidth at what center frequency?
    look into MMIC amplifiers with a 50 ohm variable attenuator between two.
     
  3. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,281
    1,232
    And what initial input voltage?
     
  4. Enforcer83

    Thread Starter Member

    Oct 29, 2010
    25
    0
    Sorry, the signal input is DC to 100 MHz into an ADC sampling at 250 MSPS. I want to be able to represent signals from 10mV to 3V peak.
     
  5. Enforcer83

    Thread Starter Member

    Oct 29, 2010
    25
    0
    I was looking at my design/reviewing datasheets when I realized I was going about the design from the wrong direction and decided to take a different route.

    Thanks alfacliff for the suggestion on MMICs. I looked at them and realized they could be vary useful and will consider using them in a different design.

    If I still need help with the original question, I will let everyone know.
     
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