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# Stability Circle

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19 Threads found on edaboard.com: Stability Circle

## Mu stability factors. How to find shortest distance from Gs / Gl to unstable region?

I found formulas for computing mu / mu prime factors. Very useful: distance from the center of the Smith chart to the nearest unstable region (stability circle) But as i understand it is useful for Gs/Gl = 50 Ohm (center of Smith chart). More interesting is to know distance between some arbitrary Gsource to nearest unstable poi

## Stabilizing LNA problem. Stability circles precision question about Smith V3.10.

While comparing my calculations of stability circles 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 (...)

## Amplifier design calculation with TI-83

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 (...)

## Load stability circle and smith chart

stability circles are outside of the Smith Chart that's why ADS used extended Smith Chart. If a circle is outiside of the Smith Chart, there isn't any real impedance that makes your amplifier means your amplifier unconditionally stable. But make zoom and check other circles carefully.

## Drawing stability circles on Smith Chart: how many cases, five?

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

## agilend AppCAD something wrong with stability circles?

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

## Plotting conductance circles to find shunt resistor to stabilize bjt using ADS.

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 circles on the smith chart as close as possible to the plotted load stability (...)

## Question on convergence in Z transform calculation

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.

## Can 0.5dB S11 cause oscillation in an LNA design?

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

## Need help to draw the stability circle

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 (...)

## stability criteria - why include unit circle in z plane?

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

## Amplifiers' unconditional stability condition

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 (...)

## Source stability circle display in ADS

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 (...)

## a question in the book "Understanding Delta-Sigma Data.

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:

## Commenting on system stability when given transfer function of a discrete system

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.

## Help: How to decrease mag(S22) when mag(S22)>1

Plot the stability circles 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 (...)

## does anyone know how to design an oscilator

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.

## Transistor for a wideband LNA design is unstable!

u can use ads -s parameter-stability circle

## power amplifier stability

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 (...)