Inverted zeroes in bode plots

Hi,

How do I incorporate an inverted zero into a transfer function that I can make a bode plot of?

This doesn't seem possible with the standard syntax provided on the website.

Another alternative would be how do I make a bode plot using a symbolic function with s as the variable.

[Corwin_S]

An inverted zero has the form (constant)/s. The syntax is designed for s^2*a+s*b+c, etc.

Answer 1

[John BG]

so you mean POLES, do you mean by inverted zero, a POLE?

[Corwin_S]

Indeed, that is absolutely correct. However for this application (an inverting buck-boost converter) it's just another name for a pole in the right half plane (specific terminology used by Bob Erickson at the University of Colorado).

I did find a very acceptable solution from a professor at the university of Utah: https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.ece.utah.edu/~ece2280/matlab.pdf&ved=0ahUKEwje9I3-pt_JAhUBzGMKHT_QARgQFggdMAA&usg=AFQjCNFWg4PJ3wC1k7UC-WIERIHgV80x4w&sig2=J8AJeH1kL-LMxRSDD5sv6Q