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Plot 3db Bandwidth

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7 Threads found on edaboard.com: Plot 3db Bandwidth
hi I have to obtain the axial ratio bandwidth .But when I tried to plot this graph, there is no point below 3db and also shows some ripples at frequencies. What has to be done to improve the axial ratio plot. pls help me thank uuu
The circuit is designed as 2nd order Multiple feedback active cmos filter, I am not sure to check -3db BW by considering Loop gain or Closed loop gain plot.
your plotting the Nyquist bandwidth, they are not different. The 3db bandwidth is the full range of frequencies over which the signal is present 3db below the max. When you plot depending on how you plot, the plot can soemtiems extend towards negative (...)
For a nonlinear Class E Power Amplifier, if I want to check its 3db bandwidth, do I just do a parametric sweep analysis of frequency of the input signal and see the frequency vs power gain plot?Use PSS Analysis with sweeping fundamental frequency which is a frequency of driving signal.
I think the transition point corresponds to the 3db point of the log magnitude. This is where the gain drops to 1/\sqrt{2} of the flat band value. This is also known as the half-power bandwidth. Take for example a lowpass filter with transfer function \frac{1}{1+s/z} with the transition point is at \omega=z[/
If you have the specs of a comercial opamp look at the plot gain versus frequency and check the gain 3db below the DC gain. Now, if you're simulating your opamp just perform an AC analysis and plot gain versus frequency and measure the gain in the same way.
vary the input frequency and calculate output voltage and plot graph between frequency and voltage ratio in db and find 3db bandwidth