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LMV321-N-Q1: output impidance od LMV321Q1M5

Prodigy 35 points

Replies: 4

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Part Number: LMV321-N-Q1

Can i get the output impidance od LMV321Q1M5

  • Hi Rony,

    The open loop output impedance of the device is provided in Figure 43 of the datasheet.

    Thank you,

    Tim Claycomb

  • In reply to Tim Claycomb:

    Dear Tim,

    Thank you for your replay.

    I just wanted to know the closed loop impedance which is negligibly small for an opamp. 

    Should i get actual impedence by dividing open loop impedance with loop gain?

    Regards,

    Ronie

  • In reply to RONY THOMAS1:

    Hi Rony,

    The closed loop output impedance can be calculated by

    Zo/(1+Aol*Beta)

    where Zo is the open loop output impedance and Beta is the feedback factor. As you can see the closed loop output impedance is dependent on the open loop gain of the amplifier (Aol) and the closed loop gain.

    Thank you,

    Tim Claycomb

  • In reply to RONY THOMAS1:

    Hi Ronie,

    yes, nearly. But divide the open loop impedance by (1 + loop gain) instead of (loop gain). Of course, for high loop gains (for instance at low frequencies) there will not be much difference...

    Kai

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