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Startup Circuit Bandgap

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44 Threads found on edaboard.com: Startup Circuit Bandgap
Hi Guys, I have a concern on the bandgap start up circuit design. I understand the need of a start up circuit in the bandgap design. But I'm not very sure, or need your feedback on the simulation outcome that Im observing. With the startup circuit added, the bandgap core (...)
I would suspect that the Schmitt threshold is too close, but on the wrong side of, the bandgap output voltage and yet the startup circuit cannot be removed without the bandgap core collapsing. The startup looks too simple to me. Start with breaking that feedback loop and see where the (...)
You could start with just what "didn't work" means. A result you didn't like, or failure to produce a result at all? bandgap / PTAT loops without explicit startup mechanisms, can easily converge in one testbench and fail in another, because when they start up they're doing so on "numerical noise" which depends on the circuit matrix and (...)
Hi all, I am designing a bandgap reference circuit, which i have tested using Cadence Spectre. The circuit works well and converges to the designed operating point without a startup circuit, which wont be the case, when fabricated. The problem now is, if i design a startup (...)
The problem with all capacitive-based startup circuits is that it's not robust. You may have to simulate not only slow startups, but also brownout conditions. It may give a lot of headache if you have very strict criteria on your bandgap startup.
Hi Guys: I am working on a bandgap circuit for a internal regulator in a DC-DC converter. The core circuit is a simple BROKAW bandgap circuit and i need a startup circuit for it.The problem is the input voltage is from 5~23 and the high voltage MOSFET my process provide (...)
this architecture is bad for low voltages. I like it since it is reliable. In your case you probably will have a bit high current through startup circuit - but you can fix it. Temeperature coefficiant - you can try to play with 1:n ratio. I noticed in my case that if I use usual 1:8 or 16, it does not work well so I went to 132 and made my own bipo
a) startup during transient sims b) set transient to conservative
Will the bandgap ref work well if I add 2 cap and 2 res in the circuit? startup without any problem? stability for work?
Hi all, Could someone help me with the startup problem in my bandgap circuit? I have startup problem for lower temperatures .i.e if i simulate ckt for weak -40. I get output waveform as attached .. Thanks in advance rampat
hi all, i wanna do some research about the startup circuit of bandgap, please help me 1:how to analysis the numbers of the stable operating points of the circuit. as far as i know, some bandgap circuits have 2 stable operating points, some circuits have 3 stable (...)
Hi All, I have a bandgap reference circuit, which works fine in simulation. (Both DC temperature sweep and transient sweep give satisfactory results.) As this is my first fabrication, I am a bit concerned about the start-up and also the stability of the circuits. startup the startup (...)
Hi this bandgap the startup circuit works fine untill I apply an offset (vos) to the opamp. With a positive offset, all it's ok but witha negative one the loop becomes open! Why does it happen? Any suggestion to avoid this bad behavior, please? TIA, CBs
hi, would you pls suggest a startup circuit for Conventional BGR,which consumes less current(in nA) and improves the response of the bandgap? Thanks
Interessting problem... I know how to figure the waves and could also point into the circuit reason but thinking of the right differential equation giving the same response is tricky! The best start would be the loop gain equation of the kT-generator and using a first order integration. That should show the slow intial startup. The next point
1.what is your initial seting for your circuit or why you do that? Becuase you have an inable pin? 2. The mean state is a stable state and in this state the VBGR will not start ever without start-up circuit. I designed bandgap voltage reference and startup circuit for it. I have read topics about BGVR (...)
A simple test, simple to automate, is that your circuit should be enter the normal mode from any node voltage combinations. If you have 9 nodes you have possible 512 states where either VDD or 0 is used as initial state. Some of the state lead to high currents or some very short time responses. But there are possible states where is takes very l
Hi Surianova, Yes in this circuit u very much need the startup circuit... This circuit has two stable states one with zero current and other one with defined branch currents... and the second state is desired. So to pull it away from first state and pushe it into second one we need to inject some current into its branches
Hello, I'm looking for some startup architecture for my bandgap, can you give me some reference. Thanks
So it has only startup function? Are there any other function???