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103 Threads found on Type 2 Compensation
do you mean a 2-stage fully differential op-amp? what is your amplifier architecture? which type compensation?
I am a french student in trainning course in M.E.V company (Toulouse in France). And I would like to condition a temperature sensor type PT1000. I think about an FPAA solution. I have 4 sensors. A discret circuit already exist but it is very noise sensitive. So it's the reason why i would like to integer this circuit in a chip. If somebody ha
In what type of applications you use this law? I have never heared for it.
Hi all What is the compensation network used for ? There are type I ,II and III, what's the difference ? Thanks --------------- chmr
Measuring DC open loop gain usually use AC analysis, which cannot use in SC CMFB circuits since SC-CMFB has only the effect in transient events. For simulate the open loop gain, you can use some type of ideal common-mode feedback.
slope comp is for current mode ic's only. better to start with voltage mode (simply comparing error voltage to a ramp) because it is more clear. so there are a few kinds of compensation. if your output cap has a lot of ESR, you get a free low-frequency zero and can use type 2 compensation (1 pole, 1 zero). if you have a low-esr (...)
what 's buck converter do you work ? Voltage mode and current mode is so different. if you using voltage mode , you can use type ii and type III compensation . but you using current mode , you just using R,C compensation in the Error amplifier out .
in the volatge mode dc/dc for buck . you need do compensation . becasue L.C is phase shift , you need to compensation to improve the total system phase margin . You can use type II or type III compesation method
this is a BJT type bandgap ckt, u can check Fig4.4 in and this book also discuss what u want to know in some chapters.
This type of error amplifier has never been my preference, even though some personalities advocate its use. I prefer the type 2 EA, that introduces a zero and helps boost the phase margin. Anyway, to answer your question, look at the picture of the Bode plot and note that the resulting gain (in dB) is merely an addition of the top two. The gain
Any comments (pros & cons) on using opamp and OTA(output Transconductance Amplifier) for compensation as type 1,2,3 for DC/DC converter (voltage mode control) ? Thanks.
i have a question, The dirver MOS of LDO is used. what different the MOS use N-type or P-type??? Using NMOS driver have some advantage??? use nmos has lower ouput impedance and no need external capacitor for compensation.
hi, need help to design /analyse open / closed loop of pwm boost type dc-dc convertor. best if we can have BODE plot to fix those inductor, capacitor,... values thanks in advance.
I am designing a project. I use ADC for reading small voltage of thermocouples. My project need to used for multi-type of thermocouples. So I need to compensate cold-junction of the thermocouples but I don't know how to. Please advise me, if I use software compensator by using a thermistor at cold-junction. Also I don't understand about isother
How do we analyse temperature compensation in op-amps using spice? I am using spectre for the same. So how can this be done for a bandagap type of circuit?
a more professional approach is to use sigma delta ADC(16bit or higher) and use a microcontroller to calibrate and linearize ADC output in digital domain. Such these ADC are available from TI(BurrBrown,ADI,Linear,...),for example AD7715,AD7714,ADS1216,ADS1241. All termocouple types with any temp range can be defined in firmware. search on
there is a lot of literature discuss about the buck , buck-boost topology of DC-DC converter pole and zero, why i can't find any derivation about boost type DC-DC converter ?
I think ,if I type compensation the err amp is ota. II or III type compensation both ota or op-amp is ok? is it correct?
Hi All I am studying buck DC/DC now. For voltage control pwm, some papers introduce the typeII and typeIII compensation. But when I study some datasheet like TI's TPS62300,TPS65023... It looks there is no external compensation RC with voltage control mode. Can anybody give me some idea on how to fulfill this (...)
dear friends I am using ad595 for a project and a K type thermcouple. My problem is that ice point compensation does not work properly. when I disconnect the thermocouple from circuit, I short circuit the input for this test, and I get around 60 mv in output of the ad595 that shows around 6'C but the room temprature is around 25 'C. can anybo
It sounds like you are using the comparator in an "auto-zero" type configuration. That changes everything, since in the autozero phase, it is essentially an amplifier in unity gain feedback. What I would suggest in order to maintain auto-zero capability is to consider auto-zeroing using the first stage in order to maintain stability. The first
hello does anybody know how i can model a 4N35 opto coupler for use in an offline SMPS feedback control circuit ? it is a one transistor forward converter and i need to use type 3 compensation. 4N35 datasheet:- Page 2 (top) of this shows type 3 compensation
members, Need details or reference for type 3 compensation in UC3525 based dc dc converter. I need practical design steps that will be helpful in designing.\ Any member who have access for such design steps details or any software that help for such calculation? Please give your comments/suggessions. Regards, Bharat
Dear friends , can some one share some details about type-3 compensation simulation for DC-DC development. I have simulated type-3 given in intersil document which i have attached. But whatever i have simulated is bit revese and stange also. So please can some one eloborate/help on this. Ni Hi Ni1009, I don`t know if
While using SG3524, for buck converter, I need to give a feedback to the error amplifier at pin 1. At the output of the error amplifier (pin 9) I have the Caps and Resistors for compensation. Do the capacitors here need to be ceramic disc capacitors necessarily? Or any specific type of capacitors?? Cannot I use Electrolytic aluminium capacitors? T
These are different things. One stage OTA, or rather an amplifying stage with one high impedance node, that is meant to work in a feedback configuration is compensated by a cap to ac ground. If you have a 2 stage amplifier you also have two poles which in uncompensated state are kind of close to each other. You can still compensate by a cap to grou
In one of consideration, for PFM with hysteresis type, the voltage ripple caused by ESR of output capacitor should be larger than the comparator hysteresis.
i have designed a small project which monitors the temperature i went for K-type thermocouple due to its wide range of temp measuring i used AD595 as the conditioning ckt for my project K-type thermocouple to AD595 and form AD595 to PIC 16F877A ADC. this is how my project build... i initially when i power-up my ckt . the temperature read by
Dear Collegue, I have a Photodiode that produce a ripetitive (but don't periodic) signal with an amplitude of any millivolts. At this true signal there is an offset that canghe in the time with an amplitude around a volt. I have supposed to reduce dinamically this offset with a circuit composed of an Programmable Gain Amplifier that amplif
Can the RHP be dealed with the type III compensation, because the extra zero.
in general compensation of capacitors and resistors in error amplifier is done so that at cross over frequency at which overall gain will be unity the phase angle does not come at 360 degree. i.e. there should be some phase margin plus at cross over frequency the resultant gain slope should be of -1 type (-20db/decade). of course you have to read a
Thanks for the help! I'll compensate it with type II compensation network. However I have one more question. The attached figure shows the bode plot for the same converter in DCM. However I've changed the small signal feedback gain a bit. Green line corresponds to k=0.1; blue line to k=0.15 and red on to k=0.2. Simulations (using ideal com
Dear amu_cpln, if I use a type B thermocouple, which gives 0V between 0 °C and 50 °C, is needed the cold junction compensation? if yes what is its temperature coefficient? Thank you for reply. Roberto
To me this looks simply like "feedforward compensation" in the feedback ladder. You see it often enough in regulators. Also called "type III" compensation. There should be no DC term, then your concerns about temperature drift (from that) go away. PSRR should be improved at medium frequencies where you are making better use of amplifier (...)
Hi! I have a thermocoupler K-type. I want to connect it to ADC input of a microcontroller, so I can measure temperature. Could someone post a schematics how to do it??? I`ll measure room temperature with 1 degree tolerance. Thanks!
What battery type you use in your system or plan to use?
Hi - I'm working on a design that uses a Linear LTC1700. I'm trying to choose values for the parts that sit on the ITH pin, but just want to make sure I'm understanding the type of network that it is using. Looking at the block diagram on page 6, it looks like it has an error amplifier wi
it depends on the load type, but usually some type of isolation is necessary to prevent electrical shocks. the simplest yet high performance feedback isolation is opto-coupler which consists of a voltage reference (e.g. TL431) and an error amplifier (opamp or TL431 itself). also compensation could be done in the secondary side. BEST
stability is the inverse of the Q factor of the circuit, so higher the Q , more stable is possible. Crystals have a Q of 10,000 to 100K for different cuts on the crystal ( AT cut vs SC cut) Watch crystals used lower Q but not MEMs tuning fork is same as watch crystal 38KHz so these are cheaper and used now for watches and PICs Temperature eff
Hi techi, i think you can do it in another way. First you must know what type of temp sensor you have, e.g. pt100, type of thermocouple (J K S or so on). Then look at Maxim and Linear Technologie or other manufactors for special chips for themperature measurement. There are some chips on the market with this feature. For example: you have
AD594 for J type AD595 for K type thermocouples... you can get 10mV/Celcius easly.
Hi,all Although the switched capacitor circuits considered so far can be analyzed with reasonable effort manually, more complex switched capacitor circuits will become a challenge. To provide a way to meet this challenge and to confirm the hand analysis results, Some scholars developed z-domain models of switched capacitor circuits. These model
Usually if you want large gain with a low supply voltage, you must use (at least) a two-stage amplifier. Eventually gain boosting techniques may be used in the first stage. However the feasibility and choice of architecture depend on a number of requirements: - type of load (just capacitive/ just resistive / both) - type of feedback (resisti
before you layout you must read the layout rule carefully,the cap's type depands on it
for simple and low cost applications, ring oscillators with +/- 20% (with thermal compensation) can be generated; ofcourse the frequency can be very high (up to GHz) to very low (KHz) with freq dividers. for more accurate ICs like uC, simple Xtal oscillator can be made by only one inverter(NOT Gate) and two external capacitor to form a colpits li
Dear: I think that it should not be oscillation. Because as u apply input to ur amp, the unwanted signal will appear. But as u remove the signal source, the unwanted signal vanish. For "oscillation", even remove the signal source, the unwanted signal will still exsit. U mention that u using miller compensation. I don't know what type of
Coaxial filter... do you mean connectorized? If yes, for Cavity type like comb, interdigital, cavity coupled etc. the main improvement is use low CTE metal alloys. Common metals or metals alloys like Cu, Al alloy, brass, iron alloy etc has CTE in the range 15...30 ppm/°C, while exotic alloys may have 6ppm/°C or less. Also reduce as possible t
FOR ?5v power supply, i think the process must be selected carefully. for other spec. , the type amplifier is so simple. first, you can use the cascode differential input stage , and the common source as the second stage. the miller compensation is enough.
dear ccw27, I hope both resistors are of the same type. And then in fabrication if both would vary by same amount.
My case is in bipolar tech, so flicker noise due to mos is not concerned. as i know, bipolar as tail has more merit than mos, right? as i use wildlar PTAT to generate current, the largest noise contricution due to RES, which between the common mode point and bipolar, as high as 20%, i have reduce it's value to 500 ohm and it's still the main contr