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TINA/Spice/THS3091: Question about analysis of current feedback amplifier

user021864
Intellectual 2145 points
Part Number: THS3091
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hi,

I wonder if the analysis of current feedback amplifier is same as the voltage feedback amplifier?

Can we still use to bode plot to analysis the phase and gain margin of the current feedback amplifier system?

Please let me know if there are anythings need to be taking into consideration when analysis a current feedback amplifier.

Thanks for your help.

  • 0
    TI__Genius 15975 points
    Hi,

    Current feedback amplifier stability analysis is a bit different compared to the voltage feedback amplifier, but you should still be able to analyze the circuit using Bode plot. The current feedback amplifier uses Open-Loop Transimpedance (V/I) and Feedback Transconductance for stability analysis, whereas the voltage feedback amplifier uses Open-Loop Gain (V/V) and Feedback factor for stability.

    You could read about the difference between the two in the below two articles:
    1. www.ti.com/.../slva051.pdf
    2. www.ti.com/.../snoa366b.pdf

    Best Regards,
    Rohit