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Why a Little Ringing in Step Load Isnít Such a Little Problem
8/14/2013

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Figure 2: Example of voltage reference dynamic output impedance plot from the LM4050 datasheet. The dashed lines represent the impedance of the load capacitor and the voltage reference without the output capacitor.  The peaking indicates the poor stability with the output capacitor included.
Figure 2: Example of voltage reference dynamic output impedance plot from the LM4050 datasheet. The dashed lines represent the impedance of the load capacitor and the voltage reference without the output capacitor. The peaking indicates the poor stability with the output capacitor included.

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Steve.Picotest
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Re: Um...
Steve.Picotest   8/15/2013 4:16:21 PM
NO RATINGS
The simple version is that while a little ringing looks like one frequency it is really in fact many frequencies.  These all contribute to circuit noise and so a little ringing equals a lot of noise.

 

Thanks for reading and for taking the time to comment

 

Steve.Picotest
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Does this topic "resonate" with you (sorry, but couldn't resist)
Steve.Picotest   8/14/2013 5:25:14 PM
NO RATINGS
Please let me know if you have seen stability problems that degraded circuit performance or feel free ask any questions you might have about how to solve such problems.  I do like opportunities to talk with all of you

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