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21 Threads found on edaboard.com: **Plot 3db Bandwidth**

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

Electronic Elementary Questions :: 13.03.2006 11:18 :: satyasri :: Replies: **1** :: Views: **760**

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 :: 26.05.2011 12:37 :: pancho_hideboo :: Replies: **1** :: Views: **822**

Hi,
How do I measure the -**3db** **bandwidth** of an antenna in HFSS?
Is it by **plot**ting the S11 and obtain the **bandwidth** from there? If yes, do I measure the **bandwidth** with reference to the -**3db** point on the S11 curve? Or is it some other reference point?
Also, in real-life measurements, how (...)

Electromagnetic Design and Simulation :: 25.10.2006 03:37 :: Kin :: Replies: **5** :: Views: **3320**

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.

Electronic Elementary Questions :: 12.04.2007 22:34 :: STOIKOV :: Replies: **8** :: Views: **1540**

Hi Guys,
I have question here. I have designed a transimpedance amplifier (TIA) which works at 1.25Gbps. I have run the AC simulation at the package level (wire-bonding model). Attached are the 2 **plot**s of the gain fucntion. Bode1 is the gain function with the multiple ground pin and Bode2 is the gain function with single ground pin. If we look a

Analog Circuit Design :: 02.01.2008 00:11 :: suria3 :: Replies: **3** :: Views: **1012**

I design a Transimpedence Amp in 0.25 with 7**3db**ohm(4200ohm) gain and 1G **bandwidth**
with input and output cap 2pF.
The **3db** **bandwidth** is about 1G in magnitude,but when Frequence more than 500M, phase become 180(inverse).Can I say the **bandwidth** of the Amp is more than 1G? And How to revise it.Thanks. (...)

Analog IC Design and Layout :: 19.01.2008 15:26 :: wangkes9 :: Replies: **2** :: Views: **898**

your **plot**ting 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 (...)

Digital communication :: 18.07.2011 20:33 :: kalyanasv :: Replies: **5** :: Views: **540**

Hum
remember what is the Laplace transforme of capacitor is something as 1/Cs with s=jw
Now if you use a logarithmique scale (as Bode **plot**) what do you get ?
-20 Log(w)-20Log(C) (So a draw in a X logarithmique scale).Nevertheless you need to polarize your PMOS Capacitor before to perform this AC simulation.
I hope it will help you on probl

Analog IC Design and Layout :: 11.02.2006 15:45 :: MLR67 :: Replies: **4** :: Views: **778**

I think
wn=sqrt(Kvco*Icp/N*C1)
wn is natural frequency, N is the divider ratio, Icp is charge pump current, Kvco is the gain of the VCO.
and wc=1.55wn
w-**3db**=2.06wn
wc is cross frequency in the bode **plot**
w-**3db** is the closed loop -**3db** bandwith
Approximately,BW=Kvco*R*Ip/(2pi*M)
now what is the M??? (...)

Analog Circuit Design :: 19.10.2006 03:59 :: Joestar :: Replies: **17** :: Views: **3472**

Hi,
For my project I have to simulate the behaviour of a resonator (used as a filter RLC circuit), and to do that I have to vary the value of the unloaded Q to **plot** the response using MWO.
Can someone give me some tips to do that?
Thanks a lot for your help.

RF, Microwave, Antennas and Optics :: 17.02.2007 14:16 :: hussard11 :: Replies: **2** :: Views: **866**

I am having a problem with op amp band width and the
bode **plot** how it is **plot**ed
what is the 3b point what is its significance in op map....:?:
can any one provide me any material regarding this or sugest any book..

Electronic Elementary Questions :: 01.04.2007 09:51 :: hussain_kiet :: Replies: **2** :: Views: **993**

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[/

Electronic Elementary Questions :: 25.05.2007 11:51 :: v_c :: Replies: **1** :: Views: **627**

I measured some parallel connected LC tanks and get one-port S parameters with 50 Ohm port impedance.
I want to extract Q value of LC tanks, but I think the one-port S-params I get is loaded S parameters. From the measurement data, the |Z11| is approximately 50Ohm(equals port impedance) and the 20log|S21| is not sharp.
Is there any ways to get

RF, Microwave, Antennas and Optics :: 07.10.2007 23:47 :: wizardz :: Replies: **2** :: Views: **762**

Hi
Could you please specify more clearly?
The PXF analysis is almost the same as XF analysis.
You can **plot** gain diagram (in dB) , and where the frequency of DCgain(max)-**3db** is your BW.

Analog Circuit Design :: 12.06.2008 04:56 :: chungming :: Replies: **2** :: Views: **474**

i guess what the stb simulation does is for the loop-gain, which will include the feedback factor. so the amplitude response in the bode **plot** will actually move up or down according the feedback factor, and the unity gain **bandwidth** changes..

Analog IC Design and Layout :: 01.07.2010 09:30 :: windknows :: Replies: **5** :: Views: **2119**

Connect a high L (10H) from output to neg input of opamp and a high C (10F) from neg input to ground. connect a AC source with AC-Mag=1V. add a cap at the output of the opamp to GND( depends on your load, typ 1p F). now run a AC analysis, sweep freq from 1Hz to 10Ghz. **plot** dB20(Vout_Opamp) and phase(Vout_Opamp) to get gain and phase response (wher

Analog IC Design and Layout :: 04.05.2012 11:10 :: findsriharsha :: Replies: **8** :: Views: **982**

In waveform window select "Axis" -> "X axis" menu. There is a "**plot** vs" button at the bottom of pop-up X axis window. Usualy it set to "Independent variable" but clicking on the button you can change X axis to any **plot**ted waveform.
BTW what kind of analysis you are talking about? For AC analysis Voltage vs frequency is a default setting.

ASIC Design Methodologies and Tools (Digital) :: 02.12.2004 20:14 :: Fom :: Replies: **16** :: Views: **2827**

Because the **3db** point is a convienent point to use. It represents the point at which the output power has dropped to 50%. It is also useful because the **3db** point represents a 45 degree phase shift which is a nice number to understand what is going in regards to the bode **plot**.
The **3db** point just works out to nice (...)

Analog Circuit Design :: 01.01.2009 15:08 :: haff99 :: Replies: **12** :: Views: **11125**

n=-10:1:10;
K=1;
f=5;
f0=697;
wc=2.*pi.*f;
w0=2.*pi.*f0;
hlp=(K./(pi.*n)).*sin(n.*wc);
hbp=(2.*cos(n.*w0)).*hlp;
here is my code, this code designs a digital FIR bandpass filter , I need to **plot** the frequency response of H'(w). Thank you.

Digital Signal Processing :: 01.10.2010 14:10 :: phoibos323 :: Replies: **5** :: Views: **623**

hi,
if your gain is Vout/Iin than it is something like 1.296-1.205 / 200u = 5300. and for your **bandwidth** you have to check where your 20log(Av) **plot** decreases by 3, i.e. the -**3db** point. that is the upper limit of your **bandwidth**. but the graphs you have there are seperate graphs.

Analog IC Design and Layout :: 29.10.2010 05:33 :: keremcant :: Replies: **6** :: Views: **612**

The peak gain is the maximum gain of your antenna.
And the total gain is the gain in the given direction.
Your results indicate that Theta=360 and Phi=0 isn't the direction of your maximum gain.
You can **plot** a 3d diagram for one frequency and check the gain figure for the direction of the maximum gain.

RF, Microwave, Antennas and Optics :: 23.04.2012 07:32 :: flanello :: Replies: **1** :: Views: **457**

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