Please find the attached circuit and bode plot. We are not able to observe the PCF (Phase Cross over frequency at -180 degree).
Can anyone let me know on finding the stability of the circuit using bode plotter.
Apology for late response.
The close loop system is stable if the zero dB crossing occurs at a lower frequency than the -180 deg crossing. In your case, base on your graph, your dB plot cross zero dB at about 60KHz while the phase plot cross -180 deg at about 1MHz. Please let me know if you have any concern regarding this.
Thank you for your response.
Does it mean the phase graphs are plotted using modulo 180? From phase plot, we were under the impression that phase was not crossing -180 degree and we could see immediate change in phase from -179 degree to +177 degree.
Please let us know if modulo 180 is used for plotting phase.
Thanks & Regards,
Retrieving data ...