Frequency response of an amplifier

Discussion in 'Analog & Mixed-Signal Design' started by TheRedDevil18, Sep 2, 2016.

  1. TheRedDevil18

    Thread Starter New Member

    May 23, 2015
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    I have some questions regarding BJT amplifiers

    1) How does different component values influence the frequency response of the amplifier ?
    2) How does the test equipment influence the frequency response of the amplifier ?
    3) Why is the output voltage measured using a 10:1 probe ?
     
  2. AlbertHall

    Well-Known Member

    Jun 4, 2014
    1,929
    381
    That's a whole 2 hour lecture.
    Would you like to narrow the field a little?
     
    #12 likes this.
  3. TheRedDevil18

    Thread Starter New Member

    May 23, 2015
    14
    0
    Yeah sure, just a short explanation would be fine
     
  4. AlbertHall

    Well-Known Member

    Jun 4, 2014
    1,929
    381
    Well, I'll make a start with this.
    A X10 probe has higher impedance than a X1 probe. Typically, 10MΩ instead of 1MΩ, and lower capacitance too. This means that connecting the probe will make less difference to the circuit you are measuring.

    Generally a X10 probe will work to higher frequencies than a X1 probe.

    A X10 probe will extend the upper voltage which is measurable - 20V/cm on the 'scope becomes 200V/cm with a X10 probe.
    Equally, a X1 probe will allow you to use the maximum sensitivity of the 'scope - the only case I can think of where a X1 probe is preferable
     
    TheRedDevil18 likes this.
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