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1000 Threads found on edaboard.com: **Stability Circle**

I did the following simulation to get the source **stability** **circle** for the specific transistor (hp_sp_AT-41435_1_19921201).
The plot I got for source **stability** **circle** is as fig-1
But the plot should look like as fig-2
Actually both of them are same plots. But in my case, the smith chart has been divided into two (...)

Analog IC Design and Layout :: 02-07-2008 03:16 :: nuddin :: Replies: **2** :: Views: **1346**

Hi all
I am doing an assignment in LNA design. I was stucked up with drawing **stability** **circle**. I read the book RF circuit design by chris bowick. In that it was mentioned that to draw the **stability** **circle** find the center and radius of the **circle** with some formulas and to mark the center follow as if to (...)

RF, Microwave, Antennas and Optics :: 01-26-2009 07:51 :: santom :: Replies: **1** :: Views: **2372**

Why do I get so many smith charts in a single ( 4 **circle**s starting from the centre?) graph while plotting L_stab**circle** using smith chart(from the palette) in ADS? Which smith **circle** to choose for interpreting the stable region for output **stability** **circle**?

RF, Microwave, Antennas and Optics :: 07-25-2013 20:25 :: Lathas :: Replies: **4** :: Views: **553**

i ve modified the msg as the previous one was wrong. was confused myself, haven't build a amplifier for many years. anyway, just a tips for you, it's much easier to confirm ur amplifier **stability** by drawing the source/load termination together with the **stability** **circle** (for each frequency), and to make sure that the source/load stay as far (...)

RF, Microwave, Antennas and Optics :: 07-22-2003 07:14 :: cray :: Replies: **13** :: Views: **2372**

You have an excellent tutorial here:
Look under RF & Microwave Theory - **stability**.

RF, Microwave, Antennas and Optics :: 04-24-2004 01:36 :: VSWR :: Replies: **4** :: Views: **2467**

Try to add a small resistor value in source…just to see if you can stabilize.
I know the NF will go up, but is an indicator.
Usually, if for **stability** is looking for a high resistor value in source, means that the input match need a different topology.

RF, Microwave, Antennas and Optics :: 10-17-2004 06:46 :: vfone :: Replies: **2** :: Views: **714**

S11 reflection coefficient of 1.2 is strange. Normally 0

RF, Microwave, Antennas and Optics :: 05-06-2006 18:11 :: VSWR :: Replies: **1** :: Views: **789**

It said that the condition of amplifiers' unconditional **stability** is K factor not smaller than 1 and delta(S) smaller than 1. But for my simulation, while this condition is satisfied, the load **stability** **circle** doesn't lie totally outside of Smith Chart. It means that the load does not satisfy the condition of unconditional (...)

Analog Circuit Design :: 08-22-2008 04:14 :: symsnowfairy :: Replies: **0** :: Views: **779**

Hello,
Recently I have been having some difficulty designing a particular stable CC amplifier. Generally I just work with the amp until it is unconditionally stable and then I just calculate the simulatenous conjugate match or determine the load that will provide a particular gain from power gain **circle**s. I have been trying to design a CC amp fr

RF, Microwave, Antennas and Optics :: 05-16-2009 12:12 :: darcyrandall2004 :: Replies: **1** :: Views: **818**

u can use ads -s parameter-**stability** **circle**

RF, Microwave, Antennas and Optics :: 07-02-2004 23:25 :: zkmicrowave :: Replies: **3** :: Views: **1101**

Why you do not make an amplifier in these ranges, add positive feedbacks to move in **stability** **circle** of smith chart and make the oscillator?
I know this way you can make the oscillator which will have frequency **stability** pretty nice.

RF, Microwave, Antennas and Optics :: 09-19-2004 07:01 :: djalli :: Replies: **10** :: Views: **1683**

Hi there!
I need to design an amplifier using ATF-36163 transistor. I also have to use Ansoft Design (I have not really get the hand of using this yet).
The amplifier is to operate at 5Ghz (that's the only requirement in terms of variables). I already have the S parameters in hand. However, I am quite lost on how to start. I have looked at t

RF, Microwave, Antennas and Optics :: 01-02-2008 14:59 :: charliemansur :: Replies: **1** :: Views: **756**

Hi
"I am designing a LNA. In ADS I get the **stability** factor 1.004 and the **stability** measurement 0.391 but the **stability** **circle**s (both source and load) include the whole Smith Chart! "
What is conflicting in that? It means that the whole Smith chart i.e. all passive terminations will result in a stable amplifier!
flyhigh

Electromagnetic Design and Simulation :: 04-13-2008 05:41 :: flyhigh :: Replies: **6** :: Views: **993**

To follow up:
As noted K>1 says **stability** but give no hint at how far outside the smith chart the **stability** **circle**s are. Similarly if you get K<1 it doesn't give you much insight as to what to do, or where to do it.
On the other hand Mu and Muprime have direct relation and give great insight.
Mu is the distance from the center of (...)

RF, Microwave, Antennas and Optics :: 03-09-2010 17:47 :: Garbonzo :: Replies: **3** :: Views: **5651**

Hello,
You said you designed means simulated or fabricated a prototype!!!
The S11 can't be positive their may be some problem with the device model
parameter or file...
Yes, it is unstable (oscillations), plot the K or B1 **stability** factor plots or **stability** **circle** measurements on smith chart....
See more here

RF, Microwave, Antennas and Optics :: 08-18-2009 08:04 :: Manjunatha_hv :: Replies: **7** :: Views: **1476**

Good day,
I am designing the front end for a 2m HAM radio. I have selected and bjt and simulated the load **stability** and found it to be unstable. I have chosen the method of a shunt resistor on the collector. The method requires me to plot conductance **circle**s on the smith chart as close as possible to the plotted load **stability** (...)

RF, Microwave, Antennas and Optics :: 03-22-2013 07:15 :: randall_press :: Replies: **0** :: Views: **245**

Hello Friends
I need an emergency help. I am studying with amplifier design. I have a TI calculator with that I need to calculate lot of equations, those are below.
1. Reflection co-efficient
2. Impedance
3. Gain
4. Radius of **stability** **circle**
5. center of **stability** **circle**
6. K
7. Delta
so on
etc
I (...)

RF, Microwave, Antennas and Optics :: 08-17-2013 12:32 :: Ahmad Salman :: Replies: **2** :: Views: **240**

if you don't know the ROC, it is generally impossible to say about **stability**. a transfer function may correspond to some stable and/or unstable functions.

Mathematics and Physics :: 02-08-2006 15:11 :: alitavakol :: Replies: **3** :: Views: **643**

why it is necessary that region of convergence of any stable system must include unit **circle** in z plane?

Digital Signal Processing :: 11-25-2008 15:31 :: nabeel_uet :: Replies: **2** :: Views: **1774**

Do any **stability** test. Take reference from any control system book.

Mathematics and Physics :: 09-19-2009 07:37 :: horzcat :: Replies: **3** :: Views: **3045**

I want to ask, are there any other cases than that:
Output **stability**:
1) |S11|<1
2) |S11|>1
Input **stability**:
1) |S22|<1
2) |S22|<1, but Rin>|Cin|
3) |S22|>1
does this inversion rule "but Rin>|Cin| [stable inside circl

RF, Microwave, Antennas and Optics :: 06-29-2013 13:26 :: Terminator3 :: Replies: **0** :: Views: **257**

Smith Charting with **stability** and Noise **circle**s
It charts **stability** and noise **circle**s.

RF, Microwave, Antennas and Optics :: 09-17-2001 08:15 :: Robin Hood :: Replies: **0** :: Views: **2307**

If the PLL sinthesyzer is single loop type then the PPM **stability** will not change. If it consists more loops, then you should calculate it by simple mathematics.

RF, Microwave, Antennas and Optics :: 01-27-2003 15:45 :: g579 :: Replies: **8** :: Views: **1257**

Hi all,I wonder if somebody would like to help me with an optimization
problem in Matematica.
I have the so called S-parameters (S11,S12,S21,S22) of a transistor circuit and are complex valued.
I want to maximize the trancducer powergain function
Gt= *|S21|^2*
Constraints: R_in= S11

Mathematics and Physics :: 03-01-2004 16:52 :: StoppTidigare :: Replies: **0** :: Views: **1534**

8) To check the feedback loop **stability** there are specialised Feedback analysers.
There is a e book in MCU filemaan
Home / eBookNew / Switch Mode Power Supply Handbood

Analog Circuit Design :: 03-07-2004 07:02 :: rauol :: Replies: **1** :: Views: **1502**

Use an ordinary op amp instead of the comparator. This will make the system loop gain more linear. Then you can brute force the **stability** by putting a capacitor across the op amp inverting input to output.

Analog Circuit Design :: 05-02-2004 20:10 :: flatulent :: Replies: **4** :: Views: **1413**

RF, Microwave, Antennas and Optics :: 07-28-2004 21:40 :: flatulent :: Replies: **1** :: Views: **2040**

hi ,why sability criterion condition,and the spacing is lambda/10,all in FDTD
regards
**stability** condition where? in what? for what?
please add more information.

RF, Microwave, Antennas and Optics :: 09-19-2004 06:39 :: djalli :: Replies: **5** :: Views: **843**

Hi,
the time step should to affect the results (only the calculation time) If you reduce the PBA fill limit to let say 70% (default 99%) the PBA cell is only used if the cell if filled with less the 70% by metal. If the cell is filled by more then 70% by metal, the entire cell is considered to be metal.
Sometimes the port setup can influence

Electromagnetic Design and Simulation :: 09-21-2004 17:50 :: RFSimulator :: Replies: **5** :: Views: **2174**

As we know PA has noise **circle** and gain **circle**,
but in your practical experience, is it impractical to consider it and just use the try and error method?
Best regards.

RF, Microwave, Antennas and Optics :: 09-28-2004 10:46 :: rhjang :: Replies: **2** :: Views: **963**

Analog Circuit Design :: 10-07-2004 07:10 :: VSWR :: Replies: **7** :: Views: **1771**

hi all,i add resistor at drain of ATF36077 to make k>1 in all band(8-12 GHZ) but the **stability** still < 1 .any method to make stabilty >1
regards

RF, Microwave, Antennas and Optics :: 10-10-2004 00:35 :: abdoeng :: Replies: **3** :: Views: **662**

hi all.what differ between the **stability** factor and **stability** factor measurment at ADS2003
(**stability** factor >1 and measured one less one) what i talk care ?
regards

RF, Microwave, Antennas and Optics :: 10-21-2004 15:24 :: abdoeng :: Replies: **0** :: Views: **528**

I know how to work on phase portrait and to find the **stability** of the system can any one tell me how we can apply energy methods to determine the **stability** of the system.

Mathematics and Physics :: 10-29-2004 06:36 :: bilalkadri :: Replies: **1** :: Views: **1380**

try v5.1 beta 2. I have encountered less **stability** problem with this version.
Element7k

Electromagnetic Design and Simulation :: 11-03-2004 15:40 :: Element7k :: Replies: **5** :: Views: **1085**

Who can help me with phase **stability** in a solid state transmitter?
How is it defined?
What is it?
How can I measure it?
Where is possible to find some references?
Thank's in advance.

RF, Microwave, Antennas and Optics :: 11-15-2004 06:11 :: rainer :: Replies: **0** :: Views: **674**

Hello,
I have some question about the **stability** of the system. The basic criterion about the **stability** of the system is whether it has the poles in right half-plane. Assume that the system has the pole P0(Unit: radians per second) in right half-plane. I think the step response may oscillate with the frequency at P0/(2*pi). But if the input signal

Analog Circuit Design :: 11-24-2004 04:05 :: leebluer :: Replies: **6** :: Views: **833**

hi,i design with **stability** factor>1 but measures one (.9-1) is there is oscillation pls reply
regards

RF, Microwave, Antennas and Optics :: 11-25-2004 17:48 :: abdoeng :: Replies: **2** :: Views: **811**

The most advanced, and the most difficult to do is the Allan Variance. Too long to explain here.
That's the good way. :)
Here's an explanation straight from the horse's mouth:

RF, Microwave, Antennas and Optics :: 11-26-2004 13:12 :: echo47 :: Replies: **2** :: Views: **843**

I think GBWcmstability when you make GBWcm>GBWdm

Analog Circuit Design :: 01-15-2005 23:03 :: rambus_ddr :: Replies: **9** :: Views: **1689**

The definition of **stability** factor (from ADS help)
Given a 2 x 2 scattering matrix between the input and measurement ports, this function calculates the **stability** factor.
The Rollett **stability** factor is given by
k = {1- |S11|**2 - |S22|**2 + |S11*S22 - S12*S21| **2} / {2*|S12*S21|}
The necessary and sufficient conditions for (...)

RF, Microwave, Antennas and Optics :: 12-31-2004 06:01 :: Mazz :: Replies: **21** :: Views: **4975**

I need the papers about loop **stability** in low dropout regulators
thank's

Analog Circuit Design :: 01-04-2005 14:15 :: jarys :: Replies: **32** :: Views: **8331**

If you want to improve temperature **stability** for coaxial filters, you can use very good and expensive material - invar.

RF, Microwave, Antennas and Optics :: 01-31-2005 10:03 :: borich_03 :: Replies: **4** :: Views: **643**

Hi all,
does anyone have some experience with ADI solver for FDTD?
What's about **stability** in time domain? To how low frequencies
is it possible to arrive?
thanks and best:
Ricy

Electromagnetic Design and Simulation :: 02-01-2005 09:29 :: ricy :: Replies: **1** :: Views: **1105**

Best way to measure **stability** to put a step load at the output and do a tran analysis & see output waveform for **stability** .Try to tweak ESR a little .

Analog IC Design and Layout :: 03-08-2005 23:25 :: mady79 :: Replies: **10** :: Views: **1655**

Are there methods that can be used to improve the **stability** and convergence rate of the adaptive IIR filtering?
Thanks.

Electronic Elementary Questions :: 02-03-2005 13:07 :: yan105 :: Replies: **1** :: Views: **638**

I want to know how many the compensation technology for **stability** for power IC. For example, miller compensation and slope compensation and so on. Is there any other compensation technology for **stability**?

Analog IC Design and Layout :: 02-23-2005 10:26 :: staric :: Replies: **9** :: Views: **1326**

HI,
In ADS, the GP **circle** is for load impedence matching network,
how to map it into the source side?
SO that we can combine it with the Noise Figure **circle**.
Thanks a lot.
Best Regards,
Tony

RF, Microwave, Antennas and Optics :: 02-28-2005 00:39 :: tony_taoyh :: Replies: **2** :: Views: **1116**

Hi,
For the amplifier design in ADS,
how to plot constant VSWR **circle**
on Gamma-S and Gamma-out
plane?
Here, VSWRin for input port,
and VSWRout for output port.
Thanks a lot.
Best Regards,
Tony Tao

RF, Microwave, Antennas and Optics :: 03-01-2005 07:05 :: tony_taoyh :: Replies: **1** :: Views: **2894**

it is easy to check the **stability** of the power amplifier,follow the following steps:
1) link the signal source and the power amplifier and the attenuator with the spectrum analyzer.
2) set the power amplifier analyzer full span
3) then turn on your power amplifier and let the signal source shut down(no rf signal output)
4)observe the

RF, Microwave, Antennas and Optics :: 03-06-2005 01:58 :: springf2000 :: Replies: **4** :: Views: **2148**

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