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# Stability System

151 Threads found on edaboard.com: Stability System

## Amplifier Instability

How did you do for stability analysis in system level?

## minimumphase transfer function

I am sure all the poles and zeros has to be on the same side of plane! Now if you want a stable system in addition to minimum phase, obviously the poles and zeros have to be on the Left side of the plane. Since the question only asked for minimum phase and mentioned nothing about stability, option 3 is the answer!

## Slakware Linux - Desktop

Slakware Linux The Official Release of Slackware Linux by Patrick Volkerding is an advanced Linux operating system, designed with the twin goals of ease of use and stability as top priorities. Including the latest popular software while retaining a sense of tradition, providing simplicity and ease of use alongside flexibility and powe

## A interesting problems about analysis of the amplifier with negtive feedback

Hello, everybody! I wanna ask a question about the stability about the negative feedback system, shown as the As the book of "Signals and systems" said, if all the poles of a system transfer function are in the left part o

does anyone know the system design and test about mems gyro(sensor + asic)? i want to make sure two question: 1) what equipmet needed to measure a mems gyro? 2) how to measure the following parameter: a, linearity b, zro stability c, rate noise density d, vibration sensitivity e, angular rate cross-sensitivity th

## DT signal fundamental period?/ DT system stability?

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## The understanding for the result of stb simulation...

It is reasonable that you get different results with the second loop open or not, as you simulate a different system in the two cases! When you break a loop, you calculate the open loop transfer function for this particular loop. Then you use this open loop gain to estimate phase and gain margins usually using stability rules based on Bode diagrams

## Problems with putting two amplifiers in series?

The main problem with using multiple stages is maintaining stability. Anything more than 2 stages and you would have problems compensating for the multiple poles in the system.

## Stability of in bridge working amplifiers

stability analysis of a multi-loop feedback system is ususally achieved by testing the outer loop. The present circuit however consists of two independant feedback loops. At first look, they seem unlinked, so it would be sufficient to perform individual stability analysis for both loops. Actually, considering the properties of a real OP, (...)

## Which plot of cotrol system is accurate and absolute ?

Hi, I am interested to know, which plot(Ny, Bode, Nichols, RH, etc) of control systems will be more accurate and absolute in describing stability (Open loop and for closed loop if compensator is added) of a system and why .......? *All plots are (resp. can be) "accurate". *However, if you are interested in sta

## stability in AC vs TRAN

You can have small signal stability and large signal instability. If you have BJTs, look for saturation at / just beyond OP, which can swing capacitance quite widely relative to small signal values. Is the oscillation related at all to the Class D chop frequency?

## Problem about gain of Power Amplifier!

The Power Amplifier gain is part of the RF system analysis of the entire transmitter chain. The gain and loss of each transmitter stage should be distributed from the modulator up to the antenna. The gain of the power amplifier is limited by different factors, as stability, number of internal stages, input available power, etc.

## stability criteria of system/circuit - quandary

Hello all, I have a question concerning the stability criteria of system/circuit that always bothered me. Q: A bode plot where the phase response toggles from 180 to -90 (or anything negative for that matter) while the gain response remains above 0dB is representative of an unstable/oscillating system. Does the same hold true if the (...)

## Screwdrivers question

Hali Zoli, Seems me that the grips are to short (for me with ca. 4-5cm shorter as wished) to have enough stability & force for driving out a fixer screw... As kit is good one selected system, but a category smaller as I would buy for general PC mountings. Greetings! Karesz

## [Urgent] PLL Bandwidth question

Increasing the BW will reduce the phase noise if VCO is the major noise contributor (which is true in most cases). But the limit on BW set by Fref is not based on phase noise but on stability. 1. The loop TF assumes a continuous system gradually becomes invalid in Fref<10*BW. One could still have a stable loop, but the analysis requires z-domain

## Is Intel 8051 equivalent to Atmel at89c51?

I think stc 8051 chips are also equivalent to ATMEL chips and furthermore stc is of good stability and anti-jamming ability : ) Agent of stc chips in Shenzhen,China. : ) contact me at

## Why we check Phase margin at the 0db

Vovan76, the reason you check stability at 0db gain is that, as was said before, the denominator of the gain becomes 0 and the closed loop gain is infinite. That means, even with no input applied, your system will produce some output (because of noise, disturbances etc.). This is of course valid when you have an inherent inversion in the loop and y

## why always impulse response?

what is meant by impulse response? why we use it to study to character of the signal that is study the linearity,stability etc? why it is called ideal system to study? plz help i hav read signa sys,control etc but i hav yet not understand this problem

## PIC16F877 based K-type Thermocouple control

hello all my friend! I am learning about of temperature control using microcontroller. I have a problem to control the stability of the system in desire set point temperature using PID control method. How to find or simulate a K,Td and Ti parameters of K-type thermocouple in Ziegler and Nichols open-loop unit step response testing. Can i us

## stability of a system from the frequency analysis

Actually not right. Theoretically, the limit for stability is phase margin of 0. Phase margin of 60 and more simply means that the step response will have very little or no ringing. Phase margin of 45 is generally considered as the lower limit for good behavior meaning there is quite a lot of ringing but it can be ok if sin signals are processed. N

## how to do the stability simulation

The system is a three-stage-inverter tia(trans-impedence amplifier) with multiple feedbacks.The feedbacks are between every two of the three inverters. How to show that the system is stable?The simulation tool I used is Hspice~

## Help in Wearable Pulse Oximetry Design using Matlab

Dear mates, I've started a project for developing a wearable pulse oximetry system for remote monitoring purpose. The idea is provide the wearer with the maximum level of comfort and freedom while maintaining the stability of the displayed data. In this regard, I am going to design and test a pulse oximetry sensor as a finger ring. However, befo

## What is importance of frequency domain analysis over time ?

we can see some poles n zeros of system easily to check abt system stability

## Oscillating unstable SMPS

If it is unstable, it means that it will be unstable from the smallest change (noise) in the circuit. As well from the input side or the load side. Only in theory, a ball can stay on the top of a mountain. The smallest breath of wind will cause tha ball to roll down. The only solution is to design the system with enough stability margin.

## 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?

## DC DC current mode buck load transient

Basically the transient response will be affected by the closed-loop system bandwidth. This is equal to the crossover frequency of the open-loop system. So the compensation has to be done in such a way that you have as large bandwidth as possible, while still meeting the criteria for stability: sufficient phase margin sufficient gain (...)

## Why are the eigenvalues of a matrix so important?

in case of system represented by a transfer function. the roots of the denominator are eigen values and their value is important to gain insigh in the stability of the systems. i think they have other advantages also but cant fgure it out.. regards

## problem in DCDC converter loop stability simulation

Does SPICE simulation include the high order (high frequency) poles/zeros effect in converter system? I have a boost converter system with variable load. I have compensated the loop with heavy load and the crossover frequency is about 15% of the switching frequency. Then I found when the load is light, the crossover frequency increases a lot, even

## close-loop stability with .lstb command in ELDO

Hi all, I need analyse a close loop system stability, so I use .lstb command in ELDO. My test case circuit is very simple as attachment and my commands according to eldo's manual are: vstb v1 v2 dc 0 ac 1 .lstb dec 100 0.1 1g .plot ac lstb_db .plot ac lstb_p However I found the dc operation point is not correct. I

## Statement about the PWM stability

It is said that a good current mode controller (two loops) will cancel one pole at output and make the system stable. Is that real? any papers talking about that?

## What kind of loop filter preferred in frequency synthesizer?

The system is usually 2nd order, so the stability is easily predicted. The PD would use a charge pump, so the filter will be RC series. To improve the reference rejection, a small capacitor, C/10 is connected in parallel to the resistor. This reduces a bit the phase margin but greatly reduces the reference leakeage. The software from Analog Devi

## OTA criterion in current mode buck converter question

In current mode DC-DC converter, there is a OTA , that is gm , which connects a resistor with a Cap for compensation. All we know this combination is compensation for system stability. But what is the spec for this OTA ? Does this OTA need to follow AC stability criterion ? That is the phase margin should be large than 45 degree ? (...)

## Superheterodyne LO stability,power ,Mixer input impedance?

To RFDave, Talking about the first question it is very simple case. AM have nothing to do with BER and its degradation. LO instability consideration is also not for this case. Anybody who try to use SSB receiver to listen AM station knows this effect.

## battery charger and stability problem

hello how to ensure stability for battery charger system when battery represents huge capacity load? regards

## What are the specifications for gyro and accelerometer sensor for navigational system

What kind of long-term stability do you want to design your system for? In other words, how long of a GPS outage should this system be able to coast through? How inexpensive do you want the whole system to be? What types of scenarios will this system be used at? These are the most critical parameters. (...)

## Why we always consider poles not zeros for system stability?

Because in the transfer function poles occur at the denominator and for s = sp where sp represents a root at pole the tranfsfer function goes to infinity which leads to instability. Zeroes, on the other hand occur at the numerator and for any finite value of s transfer function cannot go to infinity. Hope it helps.

## conditional stability

Hi, could anyone tell me the risk and usage of conditional stability in op amp design?

## effect of addition of poles and zeroes

when a zero is added...the root locus of the system ...moves to left of s=jw plane...hence stability increases.... when a pole is added the root locus of the system moves closer to s=jw plane...(assuming pole is not added far away from origin.....)hence stability decreases..... any control system book can (...)

## stability of chopper amplifier

Does anyone know how to analyze the stability of chopper amplifier? suppose the chopper amplifier has 3 stages. if we just remove the chopper switch, and analyze the stability of the rest circuit, is it ok? please help me. Thanks.

## stability for ckts having two feedback loops

Hi all , Can any one give me the references for doing the stability analysis if there are multiple feedback loops (i have two feedback loops in my circuit ) in circuit ... Thanks in advance

## How to understand phase in the simplest way?

We need phase margin of system greater than 60 degree for stability. How to understand phase in simplest way? look for the performance of a circuit how to know how much phase it need. Any one has intuitive understanding. Thanks

## importance of gain margin and phase margin

Gain and phase margin are a measure of the stability of a feedback device

## Understanding CPPLL stability

please give me a hand: Why PLL do not oscillate when open loop gain > 0dB with its phase is around -180 degree in low modulation frequency? Look at the closed-loop poles instead! If any closed-loop poles are in the right-half plane the system will be unstable. Open-loop analysis for stability can be confusing unless you

## a left zero before the second pole, is the system stable?

hi,shanmei In your figure , the stability is not a problem, and make a notice that the PM is at the lowest point of phase at the condition of (MAG>0), not at UGB because of existence of zero. As castrader said, design the circuit with z1 and p2 both away from UGF will be better, this will not bring out the p-z doublet to propagate the respon

## Low power management circuits

I think you should study theory of control. because you will meet the question of stability when you do dc/dc. The most dc/dc is a nonliear system, and is feedback loop.

## How to use a pulse signal to detect a feedback's stability

I have heard from some people that we can add a pulse signal to detect the stability of a feedback loop, I want to know how to do this, Where to add the signal , how much the rise time ,fall time, width and magnitude? Is there any paper talk about it? 3x!

## Nyquist diagram - stability

The steady state error for these two alternate inputs can be zero, a fixed value, or one growing with time depending on the order of the system. Is the system highlighted above G(s)? But from Nyquist analysis, the closed-loop system is found to be stable. Do you mean Nyquist analysis will not hav

## How to determine the stability of a CL-sys from BODE plots

As documents you ploted said. : A system should only be analyzed for stability using the Bode plot, if it has at most one phase crossover frequency. Additionally, if it has only one gain crossover frequency and the amplitude ratio as well as the phase angle are decreasing at the gain crossover and afterward, then the gain and phas

## Doubt with system stability

To ensure stability you have to look at both: Phase Margin and Gain Margin and as I understood in ur case the gain margin will be in negative meaning that ur system is unstable.

## Help:Canceling the spikes

Frist of all, it's not stability. To have stability issues you need a closed-loop system. Your current mirror is a replica-bias mirror, which simply means create an output current source based on matching of components between the Iref and Iout. Notice that the current through M9 is no way dependent on ANY other voltages/currents except (...)