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Loop injection resistor for SMPS feedback

Discussion in 'General Electronics Discussion' started by eem2am, Dec 5, 2013.

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  1. eem2am

    eem2am

    422
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    Aug 3, 2009
    Hello,
    In the below schematic, is R22 sufficient as an injection resistor?, -so that the gain and phase of the feedback loop can be measured with a frequency analyser?

    The following article states that the impedance seen looking from either side of the injection resistor should be high one way and low the other.

    Page 1, second text block down...
    http://www.ele.tut.fi/teaching/ele-3100/lk0809/tehol1/Loopgainmeasurement.pdf

    Presumably, R10 being 1k , can be considered much greater than the 50 Ohms of the sense resistor , R6.?
     

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