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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

RF, Microwave, Antennas and Optics :: 06-18-2015 04:02 :: Blesvin :: Replies: **0** :: Views: **212**

I am not sure to check -**3db** BW by considering Loop gain or Closed loop gain **plot**.
The filter circuit is realized using feedback. Hence, I see no reason to measure/calculate/simulate the **3db** BW not in this closed-loop configuration.

Analog Circuit Design :: 06-09-2015 15:32 :: LvW :: Replies: **8** :: Views: **496**

If we want to determine the **bandwidth** at a given frequency f, we should determine the **3db** fractional **bandwidth**.
according to the Shannon formula, we can calculate the **bandwidth** to be:
**bandwidth** at f =**3db**_**bandwidth***f
on the other hand when **plot** the (...)

Digital communication :: 07-18-2011 04:49 :: sharlotte :: Replies: **5** :: Views: **851**

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.

RF, Microwave, Antennas and Optics :: 05-26-2011 12:37 :: pancho_hideboo :: Replies: **1** :: Views: **1458**

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[/

Elementary Electronic Questions :: 05-25-2007 11:51 :: v_c :: Replies: **1** :: Views: **858**

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.

Elementary Electronic Questions :: 04-12-2007 22:34 :: STOIKOV :: Replies: **8** :: Views: **1784**

vary the input frequency and calculate output voltage and **plot** graph between
frequency and voltage ratio in db and find **3db** **bandwidth**

Elementary Electronic Questions :: 03-13-2006 11:18 :: satyasri :: Replies: **1** :: Views: **996**

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