Analog stuff

Discussion in 'Homework Help' started by analog_rex, Apr 19, 2009.

  1. analog_rex

    Thread Starter New Member

    Dec 11, 2008
    6
    0
    Hi,
    I am asked to design an OpAmp suitable for a filter of a specified frequency with a two-phase clock. Hence, the step response of the filter must be such that it settles to an adequate level within about 40% of the total clock period.

    I have not properly understood the above mentioned specification. What more has to be done to meet the specification? How do I start with the design?

    I have the idea to design a basic opamp, ie to decide the width and length of PMOS and NMOS in a diff pair n current mirror and to design the basic bias circuitry. Also, it will be helpful if you can me some links to read about OpAmp design.

    cheers.
     
  2. PRS

    Well-Known Member

    Aug 24, 2008
    989
    35
    Are you designing the op amp itself or are you using an op amp to make a filter?
     
  3. analog_rex

    Thread Starter New Member

    Dec 11, 2008
    6
    0
    Thank you for the response.

    Yes, the Op Amp is for a filter. The DC Gain of the OpAmp has to be > 60db with no Load resistance. Also, the Unity Gain Bandwidth should be > 1.3MHz with 15pF load in the small-signal gain/phase test circuit that is attached.
     
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