High gain 20 kHz amplifier

Discussion in 'The Projects Forum' started by kim24, Mar 15, 2019 at 5:22 AM.

  1. kim24

    Thread Starter New Member

    Friday
    2
    0
    how to desain amplifier circuit from 1mV to 3.3Vpp gain. the frequency 100Hz-20kHz and single power supply +12Vdc (-Vdc=0) without Voffset ??
     
  2. danadak

    Well-Known Member

    Mar 10, 2018
    2,413
    523
    Some questions -

    1) Amplifier to be AC or DC coupled ?
    2) Input signal is it ground referenced AC or DC ?
    3) Sensor its amplifying is it differential or single ended ? Data sheet link ?
    4) Do you know what the CM environment is ? Do you need to reject commond mode voltage
    at input ?
    5) What is being done with amplifier output ? What is its load ?

    Regards, Dana.
     
  3. eetech00

    Senior Member

    Jun 8, 2013
    1,406
    275
    hi

    Type of filter?
    There will be offset...but will it be significant? If so, the circuit will need to null the offset.

    eT
     
  4. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    7,418
    2,090
    A gain of 3300 at 20 kHz is a gain-bandwidth product of 66 MHz. That's a lot. You will need at least two opamp circuits in series to achieve that.

    Also, with a single 12 V power source (instead of +/-12 V sources) for the opamps, there *will* be a DC offset at the output pin of the last amplifier. Ideally it will be 1/2 the power rail, or 6 Vdc. What do you mean by "no offset"?

    ak
     
  5. Wolframore

    Member

    Jan 21, 2019
    41
    7
    So you want to build a line level pre-amplifier? There are many opamp based designs out there. Consider the impedance requirements also.
     
  6. kim24

    Thread Starter New Member

    Friday
    2
    0
    Idk because the problem is not spesific

    the problem needs is to simulate the signal output using spice, so I assume it's ac coupled.
    the output is single ended.
    I think the circuit will be a cascading of three amplifiers but idk how, what do you think?

    Idk because the problem is not spesific

    the problem needs is to simulate the signal output using spice, so I assume it's ac coupled.
    the output is single ended.
    I think the circuit will be a cascading of three amplifiers but idk how, what do you think?

    Idk because the problem is not spesific

    the problem needs is to simulate the signal output using spice, so I assume it's ac coupled.
    the output is single ended.
    I think the circuit will be a cascading of three amplifiers but idk how, what do you think?

    Idk because the problem is not spesific

    the problem needs is to simulate the signal output using spice, so I assume it's ac coupled.
    the output is single ended.
    I think the circuit will be a cascading of three amplifiers but idk how, what do you think?
     
    Last edited by a moderator: Mar 15, 2019 at 11:40 AM
  7. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    7,418
    2,090
    Since this is homework or a school assignment, you post your work so far and then we give you guidance.

    ak
     
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