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51 Threads found on edaboard.com: Bandgap Regulator
Hi, The only way I know of to get supply voltage independent circuits is to place a pre-regulator or an LDO set-up to power the bandgap section. You can get the LDO to have the EA ref from the bandgap itself. There's loads of information on the Internet about supply independent circuits, or in op amp design material.
Hi, I thought a regulator error amplifier needed a Vref on Vin+ and the feedback on Vin-, maybe I'm wrong for your design. What's a bandgap core? Home-made or manufactured? I ask as it's nice to learn things, and discrete voltage references are something I like but know will never be any good, and you're an IC designer. Would a resistor betwe
zeners are not efficient nor stable compared to bandgap reference diodes used in all LDO's (LM317 type and many others) Zeners must draw more than the worst case load to ensure when loaded there is still enough current to get past the knee in the zener. Then when no load, that current * voltage can lead to thermal problems for high power. So
Had you performed a reserarch ? There are a lot of informations avaliable : +++
Hello, Attached is a picture of an LDO schematic seen in the IEEE paper: A 1.21V, 100mA, 0.1uF - 10uF output capacitor LDO voltage regulator for SOC applications. The vref is a bandgap voltage (1.2V) and the resistors R1 and R2 are adjusted to deliver the desired output voltage (2.5V). The VDD = 3V The output PMOS pass device (Mpass) is made l
1) You can't. Precision bandgap references are almost always trimmed for accuracy. 2) I don't think there is any reason, other than it being a nice rounded numbers that industry partners thought was good for standardization of ADC/DAC references and regulator feedback margins. 3) Vbg = Vbe + k * delta(Vbe) will always give you around 1.2V. Low volt
Hi All, could please someone recommend me a book or a document with a compilation of basic analog building blocks in CMOS, like for example: power on reset undervoltage detection voltage regulator 0scillator bias generator bandgap etc what I am looking for is not a theory book but a compilation of different topologies, if possible
Besides Error amplifier, you need to design current bias, bandgap, OTP, current limiter.
There are two tricks for low noise voltage regulators: 1) choose one that allows you to put an external capacitor across the bandgap reference, such as LM723, NCP623, etc 2) Have enough input shunt capacitors (and maybe input series inductance or small resistance) to form a lowpass filter for any input noise above 10 KHz (where most regulat
In a power IC the bandgap and any cascoding is unlikely to be significant in the end, area-wise. It's the power devices' area. The current for a reference and housekeeping analog should not need much device width. Stacked MOS diodes and a resistor make a good enough shunt regulator, a pass follower (high voltage capable) makes a series
How to setup in laboratory to test PSRR of a voltage regulator / bandgap circuit
Hi, I want this paper, could you help me if you have? Thanks for your kindly help in advance 1. A Low Noise CMOS Low Dropout regulator with an Area-Efficient bandgap Reference SUMMARY In a low dropout (LDO) linear regulator whose reference voltage is supplied by a bandgap reference, double stacked diodes increase (...)
Since the input power is fundamentally limited I would go with a shunt regulator, right after the rectifiers. A very low power bandgap and shunt transistor. Or even just a simple FET stack (say, 3*VT) maybe with a high ratio current mirror at the bottom so you have usable drain headroom. Question is, how good and process-repeatable does
i think i need a pre-regulator circuit . tks Right. As most bandgap ICs are rather low power devices, a simple resistor - zener diode combination should do. BTW: Such questions (nothing common with Analog IC Design & Layout) should better be asked in this forum .
1st, you have make sure the power bus is strong enough to supply large current loading, this could ensue the power of bandgap is higher enough for ouput the ideal value you wanted. 2nd, you need optimize your bandgap circuit, it coud work well with lower power. Added after 2 minutes: 3rd, you need optimize
first you can generater the internal VDD by regulator and the bandgap can be use VDD for power supply
In conventional bandgap topologies the minimum voltage is VBE+a*VT+VDSAT It is the series path of the parasitic PNP, a kT multiplier and a PMOS regulator current output. In a non-curvature compensated band the absolute temperature coefficients of VBE and a*VT should cancel dVBE/dT~-2mV/K dVT/dT=+(1/300)*26mV so a solves to abou
three bandgap circuit in one kind of booster.who can tell me why so many?
hi~hr_rezaee If Vref is fixed like bandgap ref. and then Driving Tr. in Opamp use pass tr. as PMOS. is it possible?
hi all! if the bandgap output, i buffer it with a opamp before connect to other circuit as reference voltage, is it fine? accuracy?