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32 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 :: 07.02.2008 03:16 :: nuddin :: Replies: **2** :: Views: **1272**

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 :: 26.01.2009 07:51 :: santom :: Replies: **1** :: Views: **2310**

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 :: 22.07.2003 07:14 :: cray :: Replies: **13** :: Views: **2265**

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

RF, Microwave, Antennas and Optics :: 24.04.2004 01:36 :: VSWR :: Replies: **4** :: Views: **2348**

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 :: 17.10.2004 06:46 :: vfone :: Replies: **2** :: Views: **674**

S11 reflection coefficient of 1.2 is strange. Normally 0

RF, Microwave, Antennas and Optics :: 06.05.2006 18:11 :: VSWR :: Replies: **1** :: Views: **720**

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 :: 22.08.2008 04:14 :: symsnowfairy :: Replies: **0** :: Views: **677**

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 :: 16.05.2009 12:12 :: darcyrandall2004 :: Replies: **1** :: Views: **721**

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 :: 25.07.2013 20:25 :: Lathas :: Replies: **4** :: Views: **424**

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

RF, Microwave, Antennas and Optics :: 02.07.2004 23:25 :: zkmicrowave :: Replies: **3** :: Views: **1013**

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 :: 19.09.2004 07:01 :: djalli :: Replies: **10** :: Views: **1647**

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 :: 08.02.2006 15:11 :: alitavakol :: Replies: **3** :: Views: **589**

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 :: 02.01.2008 14:59 :: charliemansur :: Replies: **1** :: Views: **680**

Hi all,
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!
The **stability** factor and measurement say that LNA is stable, but the **stability** (...)

Electromagnetic Design and Simulation :: 13.04.2008 03:29 :: si14 :: Replies: **6** :: Views: **924**

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

Digital Signal Processing :: 25.11.2008 15:31 :: nabeel_uet :: Replies: **2** :: Views: **1711**

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 :: 09.03.2010 17:47 :: Garbonzo :: Replies: **3** :: Views: **5221**

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

Mathematics and Physics :: 19.09.2009 07:37 :: horzcat :: Replies: **3** :: Views: **2906**

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 :: 18.08.2009 08:04 :: Manjunatha_hv :: Replies: **7** :: Views: **1410**

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 :: 22.03.2013 07:15 :: randall_press :: Replies: **0** :: Views: **172**

Did somebody used AppCADS stab **circle**s from S-param files? I can't see, or something looks wrong, or line instead of **circle**?!

RF, Microwave, Antennas and Optics :: 28.06.2013 06:58 :: Terminator3 :: Replies: **0** :: Views: **126**

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 :: 29.06.2013 13:26 :: Terminator3 :: Replies: **0** :: Views: **228**

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 :: 17.08.2013 12:32 :: Ahmad Salman :: Replies: **2** :: Views: **201**

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 :: 01.03.2004 16:52 :: StoppTidigare :: Replies: **0** :: Views: **1476**

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= S

Mathematics and Physics :: 06.04.2005 21:07 :: cygnet :: Replies: **0** :: Views: **622**

Plot the **stability** **circle**s and then find the nearest **circle** to the center of the smith chart and then add either series or parallel resistance that will have a value whic cuts the vicinity of the **circle**...
This is most basic method to obtain **stability**.
In that case , the vicinity of the neares (...)

RF, Microwave, Antennas and Optics :: 17.05.2005 10:39 :: BigBoss :: Replies: **7** :: Views: **816**

here is the openloop gain of a system. I am a little worried about the point A. at this point, the phase is around -160 degree. Does this have any impact on the performance or **stability** of the system? the system is using 100% feedback.Normally rule of thumb is: feedback=very possible chance for in**stability**.
What is this syst

Analog Circuit Design :: 29.06.2005 16:16 :: djalli :: Replies: **9** :: Views: **1066**

In case of DTFT of a system function, it can do the transform only if the h is a stable sequence Σh should be less than infinite. So we can take DTFT only for stable systems. But by using z-transform we can transform even the unstable systems and can analysis the **stability** criterion.

Electronic Elementary Questions :: 14.02.2006 00:23 :: Indian :: Replies: **12** :: Views: **4456**

hi
I am designing oscillator.
i want to plot **stability** **circle**s.
coordinates that i got for input & output port of transistor are
1)for input
centre = 1.77<83deg. & radius = 0.88
2)for output
centre=32.32<-80deg
radius = 33.07.
how to plot this on smith chart.

RF, Microwave, Antennas and Optics :: 19.02.2007 04:30 :: Abhishekabs :: Replies: **3** :: Views: **1310**

if poles tells us about the **stability** of the system,what do zeros tell us about the system?

Digital Signal Processing :: 21.05.2007 06:34 :: engrbabarmansoor :: Replies: **5** :: Views: **985**

hi,
I have a question about **stability** criterior in negative feedback circuit,
i hope somebody who have read "Understanding delta-sigma converter",Temes,G.C.
can tell me the answer..
In circuit theory, we know in a nagative feedback system,the loop gain L1(f) is
stable if |L1(f)|<1 at 180 degree phase shit location,say f=f1,
my question is:

Analog Circuit Design :: 12.06.2007 01:55 :: sethtalk :: Replies: **2** :: Views: **635**

the Z-transform is a complex transform deals with the explanation on impedance. here in your que z<|1\a| means your system transfer function will be convergent only untill your impedance value remains between the values of -1\a to 1\a. that means your system's ROC i.e. **stability** is inside the **circle** with radius 1\a.

Digital Signal Processing :: 30.10.2011 08:14 :: jigisha :: Replies: **5** :: Views: **590**

Minimum phase polynomials have all there zeros inside the unit **circle** of Complex plane. In control theory and signal processing, a linear, time-invariant system is said to be minimum-phase if the system and its inverse are causal and stable.
Not quite correct.
Minimum phase systems must not have zeros in t

Analog Circuit Design :: 19.07.2012 03:46 :: LvW :: Replies: **4** :: Views: **2153**

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