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207 Threads found on Inl Dnl
Hi All, I am working on 14bit SAR ADC with a sampling frequency of 5KS/s. I am supposed to do dnl and inl analysis to get information about missing codes. what I know to do dnl and inl analysis is, apply a super slow ramp so that each code appears at least 10 times. Now my problem is, I have as much as 2^14= 16384 (...)
Hi, I have a couple of question about distortion and non-linearities in ADCs. I wonder except inl and dnl that cause distortion in ADCS, what can cause a bad THD. Assume someone wants to model the distortion in an ADC, say third order harmonic. I wonder if the extra term added to the pure signal (cos(ωt)) should be βcos?(ωt)
Hello everyone, I am using CARRY4 primitive as delay line in my design and now I would like to characterize my design to evaluate the effect of temperature, jitter, etc. on the behavior of CARRY4 primitive and calculate and plot the dnl and inl curves. I do not know how to come and start with the characteriazation?! I know that I have to perform
Not Useful Sure it would - if you'd just bother to take the trouble and read the definitions! Collecting more samples per code needs days of simulation. What should I finally do to calculate inl & dnl ...? For your few samples you can easily plot the simple arithme
i have found the inl and dnl of flash ADC in cadence... how can i find the SNR?? ANY EQUATION or in tool cadence??
Assume the offset is linear/insignificant (with offset-cancellation), the linearity is limited by the matching of the DAC capacitors and the DAC type (binary-/themometer-code). Binary type has fewer switches but larger dnl; both types have the same inl. Hi Guys, Regarding a 10 bit sar adc, using binary capacitance for the D
ADS1174 having ?0,0045 LSB inl Nope. +/- 0.3 LSB, which is still excellent. An inl specification includes an upper limit for dnl, by the way. SAR and SD converters have both their specific pros and cons. Obviously SD-ADC have superseded other topologies in the low and medium speed range, you are taking the dataconversion "main ro
No, I don't think this will work, sorry: a reasonably good ADC shouldn't have dnl-, even inl-values greater than a few single bits (at least for N≦12), generally I'd estimate less than 2N-7.. 2N-8 bits, see e.g. here for a 10bit converter: 110871. That means if you measure the dnl/inl values on
Hi, dear professionals, I just started analog IC design. I use LTSPICE to design a flash ADC. At this stage, the dnl and inl need to be measured. Is there any method for LTSPICE? Thank you very much! Really appreciate your help!!!:-o:-o
See e.g. MAXIM's Application Notes 283 : inl/dnl Measurements for High-Speed Analog-to-Digital Converters (ADCs) 2085: Histogram Testing Determines dnl and inl Errors or ATMEL's 110009
When I Rail to Rail OPAMP designed, I found that some opamp output range is really rail to rail. For example, BUF16820 & BUF16821 inl/dnl specification is like this. 108112 In BUF16820, when VDD power is 18V, inl measure voltage is 17V. So voltage difference of rail(VDD) and amp's output is 1V. Yes. B
sir i am doing 8 Bit folding 8 interpolating ADC in cadence. plz tell me how to calculate inl,dnl factor using calculator option of cadence tool. is there any other way to calculate inl,dnl factor. How to calculate noise margin and SFDR ?
The easiest way to calculate inl/dnl for adc is to used histogram method. Here You have everything:
If a converter has dnl =-1, has a missing code, what is its inl?
hello, i was trying to find out inl and dnl for 8 bit pipelined adc by using "Maxim Integrated's" code given on their website. but facing some errors. i just want to cross check the format of file which is required by this code. if anybody has sample file format which will work as input file for that code, pls send me as I really need it. Th
What is typical value of inl and dnl of ADC in LSB? Thanks.
I have designed a 10 bit pipelined ADc in cadence.From the wave forms I have obtained the. csv file which contains samples of the 10 digital bits and inputs. How can we link this to matlab so that these codes are read and hence the inl and dnl plots are obtained??
I have designed 6 bit ADC.can any one please tell me how to use .csv file in MATLAB for inl,dnl calculation. and How to get IDEAL values for error plot.
First you need to simulate the full input sweep, picking off the actual input voltage value at each code transition and subtracting from it the ideal transition value. Store all of these (0 - 2^N-1) and use either Ocean code or an external tool to process the individual bit errors to get dnl (max()) and inl (I forget, something like sum()/2^N I
can someone plz help me with the formulas to find the SFDR,SNDR,inl, dnl etc for a pipelined ADC in Cadence Software...
Many articles, which discuss the relationship between ADC linearity and dynamic specs, say ... inl is related to harmonics, while dnl is relevant to noise of ADC. Then I'd like to discuss this popular equation: inl=sum(dnl) Isn't "sum(dnl)" term in this equation related to noise, since (...)
I am no expert on this topic, but I can give it a try. You can connect the output of your ADC to a ideal DAC (Verilog-A model or similar). You can then extract the simulation waveform of the DAC output and calculate inl and dnl. I personally prefer to write Verilog-A models for both DAC and an inl/dnl evaluator which (...)
I don't agree to the see SD- and conventional ADC that opposite. A conventional high speed ADC will show output noise as well, even the signal source does, so you need to refer to averaging/statistical methods. The chaotic (but not purely random) noise generated by a SD will be reduces to an acceptable level with appropriate decimation filters, so
Can anyone tell me how to calculate inl or dnl for SAR circuit in cadence virtuous 6.1.3
I Have designed the schematic of 8bit SAR ADC in cadence . For calculating the inl and dnl of adc, i have used the slow input ramp and the output digital data is recorded in the tabular form in .csv format . As i want to proceed calculation in matlab by using the code provided by maxim but not , please help me providing the procedure
Could you please advice how to measure inl or dnl of the Sigma-Delta DAC. Please note, that the input signal frequency is Fin, but the output signal frequency is OSR*Fin. Thanks.
Here's a simple matlab setup which evaluates dnl & inl from reconverted (D2A) analog measurement values from a full range sinus (I guess) over a 10bit ADC. Perhaps it can serve as template:
Hi Guy, Could you please help me on the derriavation of offset and amplitude formula being used in the computation of ADC inl and dnl using code density testing. The formula is in the attached file. Appreciate any help. Regards.
I would like to ask this question: I have designed a TDC in 130 nm CMOS in Cadence. Now I want to simulate the inl/dnl figures due to local process mismatch. Is there another way to do this instead of using the technology files containing the statistical data and running some monte carlo simulations? Does is make any sense to calculate (...)
The easy way is to do a histogram of the output code with the bins being 0:255. The dnl is the number in the bin divided by how many should be in the bin, and then you subtract 1 from that. It is a probability calculation, but if you have a ramp input it is pretty easy. So, if you have 4096 points for your input, for an 8 bit dac e
Most of the causes from inl.dnl are from device mismatch. So you've gotta multiply your simulation time by a few hundred fold. That is why most ADC design is done in MATLAB or other faster platforms. Just so that it could be simulated at a much shorter timeframe. Or alternatively, if you know where your worst case inl/dnl is (...)
hey all i have a simulink model of 8 bit SAR ADC. i have to find the inl/dnl of that model. i have got a matlab code for that. there is a command load(o_adc_dig.mat) in that file but there is no such file in the simulink model. other files present in the model but not the above one. plz any one could tell me what this file could be. i
Folks, I'd like to choose a DAC topology to have below spec: 1. 100KHz sample rate 2. 10 bit 3. minimum dnl but much relaxed requirements on inl Can anyone suggest a topology to have smallest area? Thanks, SQ
Hello, We want to evaluate the performance of the CAN 16 bits AD7621. First of all, we want to extract the Differential non linearity and the integral non-linearity. For that, the CAN is soldered on PCB board ( based on the evaluation board). We use a ultra low distortion function generator to drive the input of the device through 2 AD8021.
dnl will be never zero, because it describes the difference between the nominal and actual threshold levels. But it's clearly < 1. Reducing the resolution from 16 to 12 bits divides the maximum dnl and inl numbers by 16 rather than 4, by the way. So you'll get a dnl of 0.25.
I'm using current steering architecture and after running corner analysis in cadence, I have a bunch of plots cluttered together at the output. I was confused on picking the one that has the worst case inl/dnl. Anybody has any suggestion?
I have designed a 12-bit charged distribution SAR ADC in spectre. How can I simulate inl and dnl? 
Hi dear all friends, I designed an 8bit ADC and it works properly in normal conditions (without applying mismatch). Now I'm going to run monte carlo simulation to calculate inl and dnl. The main part of my ADC is comparator. For testing comparator circuit, I applied a constant voltage as a reference voltage and a ramp as an input voltage to the
Hi, all, I encounter a problem on my 14bit ADC, when i test it, the code at 2^10-1, 2^11-1 and 2^12-1,2^12-2 will be missing, and this will degrade the inl and dnl to 3LSB. but when i test the dynamic performence, the THD and SINAD is good. so i want kwon what can make the word missing? and what is the relation between (...)
How will inl and dnl affect the ADC output. I can understand inl would make the output 1001 instead of 1000 in a 4 bit ADC. How will dnl affect the output.
Hi All, May I know what the acceptable inl and dnl errors are? I think the acceptable inl is ?1LBS, is it not? Im not sure of the dnl error. THanks a lot in advance!! M
Hi Guys, I'm newbie on nyquist Is there any material/doc having theoretical proof of relationship between a DAC being monotonic and maximum inl/dnl? Thanks in advance!
I feel you have something very wrong here. Your output codes should be very close to your input line. Are you using an ideal DAC to sample your digital codes back into analog for the comparison? If so make sure your DAC is not clocked and works instantly, or you could also slow down your ramp to make sure you don't have a clocking problem. The
Can any one tell how leakage of capacitors in cadc increses the non linearity error of saradc ? how inl/dnl error varies with CV chara of capacitor of cdac? thanx in advance :lol:
Hai, i am designing a time interleaved saradc which is a combination of 16 saradc operating in interleaving fashion. Can any one suggest a method to simulate inl and dnl of this time interleaved saradc.. Thanx in advance :-)
Hi, I just finished designing a time-to-digital converter (TDC) within Cadence but I don't know a effective way to test it. As TDC is a device that converts the input time to digital code, I firstly tried to vary my input time from 0 s to 300 ps and observed the output digital code. Yet since the resolution of the TDC is around few picoseconds,
Hi all, can someone explain to me how to calculate dnl/inl from FFT ??
plz ................
Hi all, I am designing 3 Bit Flash ADC in cadence. Do any one know how can i check the specifications like dnl inl etc. of ADC in cadence. If any one have any tutorial on manual , which explain the procedure would be very help full to me. Thanks joe
I want to design a PipelineADC , But I do'nt know how to measure the dynamic param such as SNDR, SFDR, and dnl, and inl. how to codeing to analysis above parameter?? Who can help me ?? thanks !!