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

While comparing my calculations of **stability** **circle**s i compared it to Smith v3.10 program and found one problem:
118692
i am using NE3210S01v1_2-18_2_10.S2P file as data source. Problems occur at frequency of 7.5GHz, where output **stability** **circle** (instable outside) overlaps reflection=1 **circle** in much (...)

RF, Microwave, Antennas and Optics :: 06-22-2015 01:32 :: Terminator3 :: Replies: **2** :: Views: **160**

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: **371**

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: **803**

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: **427**

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 :: 06-28-2013 06:58 :: Terminator3 :: Replies: **0** :: Views: **332**

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: **439**

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 :: 10-30-2011 08:14 :: jigisha :: Replies: **5** :: Views: **699**

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: **1605**

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: **2526**

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: **1893**

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: **907**

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 Integrated Circuit (IC) Design, Layout and Fabrication :: 02-07-2008 03:16 :: nuddin :: Replies: **2** :: Views: **1492**

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 :: 06-12-2007 01:55 :: sethtalk :: Replies: **2** :: Views: **771**

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: **764**

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 :: 05-17-2005 10:39 :: BigBoss :: Replies: **7** :: Views: **1024**

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: **1784**

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

RF, Microwave, Antennas and Optics :: 07-02-2004 23:25 :: zkmicrowave :: Replies: **3** :: Views: **1238**

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: **2492**

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