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151 Threads found on Stability System
How did you do for stability analysis in system level?
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!
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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
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
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 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, (...)
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
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?
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.
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 (...)
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
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
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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
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
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
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
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~
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
we can see some poles n zeros of system easily to check abt system stability
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.
why it is necessary that region of convergence of any stable system must include unit circle in z plane?
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 (...)
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
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
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
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?
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
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 ? (...)
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.
hello how to ensure stability for battery charger system when battery represents huge capacity load? regards
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. (...)
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.
Hi, could anyone tell me the risk and usage of conditional stability in op amp design?
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 (...)
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.
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
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
Gain and phase margin are a measure of the stability of a feedback device
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
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
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.
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!
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
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
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.
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 (...)