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Multi-Stage Amp Build

Discussion in 'General Electronics Discussion' started by Jammill, Oct 27, 2015.

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  1. Jammill

    Jammill

    6
    0
    Oct 7, 2015
    Need help on how i should start this and find the values for the input impedance buffer

    • The amplifier should be powered by a single 12V supply
    • The input impedance should be >1 MΩ
    • The input stage should be an AC coupled FET source follower(Buffer)(2N7000 Transistor)
    • The input voltage 110 (mVpp)
    • The output stage should be a phase splitter giving two outputs which have 180o ±2 o relative phase shift
    • The output impedance of the inverting output should be within 10% of your assigned spec. value
    • Total gain should be within 0.5dB of your assigned spec
    • The gains of the two gain stages should be within 1dB of each other
    • Each output should have <0.5dB gain variation over the 50Hz to 10kHz range
    • The two outputs should not differ by more than 0.2Vpp at 1kHz
    • Both outputs should be AC coupled and measured across 1MΩ load resistors
    • Only one transistor should be used in each stage (4 transistors in total)
    • Gain stages should use BC547B npn transistors

    Gain = 31dB
    Output Impedance of inverting output (kΩ) = 2
     
  2. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    Pretty much any op amp can do this. Doing the same 2 transistor gain stages would be damn near impossible.

    Bob
     
  3. AnalogKid

    AnalogKid

    2,425
    690
    Jun 10, 2015
    Homework problem?
     
  4. Jay2OR

    Jay2OR

    6
    0
    Dec 7, 2014
    Yes
     
  5. AnalogKid

    AnalogKid

    2,425
    690
    Jun 10, 2015
    What are the assigned output impedance and total gain?
    Since you will be getting the grade, not me, why don't you do some of the work? Based on your research and teachings, work up a preliminary schematic of each stage and post it so we have something to discuss.

    ak
     
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