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help on bode plots...


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There is a TON of stuff on the internet about bode plots…

In a nutshell, the bode plot shows you the gain and phase relationship between an input and an output. It can be used to determine stability. As a real world example, bode plots are used to check for stability in SMPS feedback loops. While transient load test can only give a partial indicator as to the loop stability, a bode plot will give you the whole story. For a power supply, you would like to see a minimum of 45 degrees phase margin, a cross over slope of –1 and 20dB of gain margin.  Less than 30 degrees of phase margin at crossover is asking for trouble and the unit is probably conditionally stable may oscillate.

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