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 [Help] How are input impedances of OpAmp meatured? 

Last post Wed, Jun 12 2013 5:50 PM by xxgenerall. 2 replies.
Started by xxgenerall 07 Jun 2013 09:27 PM. Topic has 2 replies and 685 views
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  • Fri, Jun 7 2013 9:27 PM

    • xxgenerall
    • Top 200 Contributor
    • Joined on Wed, Feb 8 2012
    • Nanjing, Jiangsu
    • Posts 37
    • Points 455
    [Help] How are input impedances of OpAmp meatured? Reply

    Hi,

    OpAmp has differential input impedance(Rd) and common input impedance(Rc). In my opinion, Rd=4*Rc. However, datasheet of OpAmp indicates that Rd is not simply related to Rc this way. Well, how are input impedances of OpAmp meatured or tested?

     Can anyone help me? Thanks in advance!

    • Post Points: 20
  • Mon, Jun 10 2013 7:07 AM

    Re: [Help] How are input impedances of OpAmp meatured? Reply

    How the impedances are related is presumably dependent upon the architecture of the amplifier. You really should read the forum guidelines and post properly framed questions, otherwise you really won't get anyone being able to help you.

    Kindest Regards,

    Andrew.

    • Post Points: 20
  • Wed, Jun 12 2013 5:50 PM

    • xxgenerall
    • Top 200 Contributor
    • Joined on Wed, Feb 8 2012
    • Nanjing, Jiangsu
    • Posts 37
    • Points 455
    Re: [Help] How are input impedances of OpAmp meatured? Reply
    Thanks Andrew!
    • Post Points: 5
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Started by xxgenerall at 07 Jun 2013 09:27 PM. Topic has 2 replies.