I have a design of a LPF however I can't seem to be able to find a way to plot phase against frequency. Does anyone have an idea how to do this in proteus?
Thanks
Amplitude (or attenuation) is an aspect of filter performance. By examining attenuation you might relate it to the plot of frequency vs phase.
(Example: 45 degrees happens to occur at the 3dB cut-off frequency.)
Or what about phasor diagrams? That involves trigonometry. It's inter-related to filter performance. It may be suitable for plotting frequency vs phase.
Helpful video:
Analog Filters - Basics, First Order, Ideal Filters, RC Low Pass, Phasor Diagram, Bode Plot
(Example: 45 degrees happens to occur at the 3dB cut-off frequency.)
Yes - however, for a first-order filter only.
As another example: A second-order low- or highpass has a phase shift of 90 deg at the pole frequency (which is not necessarily identical to the 3dB-cutoff frequency)