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What is the TLV2372 Open Loop Output Impedance.

Philip Thackray
Prodigy 80 points
Other Parts Discussed in Thread: TLV2372, TLV2370, TINA-TI

 I want to compute the output impedance over frequency of a voltage follower using the TLV2372.  I have the open loop voltage gain as a function of frequency but I need the opamp's open loop output impedance to make the calculation.

Phil

  • 0
    TI__Guru* 93105 points

    Hi Phil,

    Please see the attached TLV2370 Aol and Zo graphs. The TLV2370 is a single op amp variation on the TLV2372 and theIR Aol and Zo will be the same. These graphs are from recent measurements taken by our staff. Ignore the upward spike in the gain/phase plots at frequencies well beyond the amplifier's bandwidth.

    I've included the TINA-TI PSpice files in case you want to use the simulation model. Note that this model s accurate for ac parameters, but isn't optimized for dc.

    Regards, Thomas

    PA - Linear Applications Engineering

    TLV2370 Aol.TSC

    TLV2370 Zo.TSC

  • 0 in reply to Thomas Kuehl
    Prodigy 80 points

    Thomas,

    That is it - thank you. It appears that the output impedance is high until the internal compensation capacitor comes into play. I guess this is because the output is actually the drains (high impedance) of a N and P channel transistors.  At low frequencies these op-amps are like trans-impedance amplifiers becoming volt in volt out only as the phase shifts to 90 degrees.

    Phil