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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: **215**

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: **508**

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: **860**

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: **1474**

Consider a single real zero in the left half of the s-plane. This will have the form (s/z+1) ==> (jw/z+1) in time constant form. At low frequencies (w near 0), the magnitude of this term is approximately 1 ==> 0 db. At high frequencies (w/z >> 1), the magnitude of this term is approximately |w/z| ==> 20*log_10(|w/z|) db. At frequency w=w1, t

Elementary Electronic Questions :: 05-25-2007 11:21 :: powersys :: Replies: **1** :: Views: **871**

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: **1791**

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: **1004**

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