How to obtain a meaningful group delay graph using matlab

1. How to plot the group delay in matlab?
2. How to simulate group delay?
3. How do you read a group delay?
4. What is acceptable for group delay?

How to plot the group delay in matlab?

Use the grpdelay function to compute group delay of a filter. For example, verify that, for a linear-phase FIR filter, the group delay is one-half the filter order. The phase delay of a filter is defined as the negative of the phase divided by the frequency: τ p ( ω ) = - θ ( ω ) ω .

How to simulate group delay?

What you need to do is click into the S-parameter "instance" in your schematic, and open up the parameters tab, which is shown below. Then check off group delay, and run the simulator. Now when you simulate, every single stinking S-parameter will have an associated group delay available in the plotting window.

How do you read a group delay?

The so-called “group delay” is simply the time lag between the envelope of input burst and the envelope of the amplitude of the output burst. So, group delay means a propagation delay through a filter, measured on the envelope of the signal.

What is acceptable for group delay?

1 kHz and above – anything less than 2 ms is good. 200 Hz – 1000 Hz – less than 4 ms. Under 200 Hz – Expect higher numbers. Even 30-40 ms for the very low frequencies.