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156 Threads found on edaboard.com: Adc 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 codes and the (...)
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 (...)
Hi, when we calculate the SNDR or ENOB in adc, we add all the noise together, i.e., quantization noise, kT/C noise, dnl noise, etc. Let's say dnl is +/- 0.5LSB and LSB=1mV, what's its equivalent noise in terms of mV? Thank you.
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 Obviously SD-adc have superseded other topologies in the low and medium speed range, you are taking the dataconversion "main ro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
I want to find dnl in flash adc design.I need to find my circuit is working properly or not? How the flash adc design track input sin signal wrt reference voltage
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:
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
Hello, I am starter in adc design. While I am going through adc specifications, i found that ENOB =12 though it is 16 bit adc. Then what is the specific reason for using 16 bit adc than 12 bit adc? Can not we use an 12-bit adc without any missing codes? For any adc, what (...)
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.
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 prints the (...)
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
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
hi, i need a help. i want to write a function which simulates an adc (8,10,12,14bits) in matlab. the function gets a vecotr and dnl. can anybody help me , i dont have any idea how to make it.
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 INL/dnl with
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 going to be, (...)
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
The problem may be caused by digital (adc data interface) to analog crosstalk.
I have an adc (LT1859) of 16 bit. Dynamic Input range is 0-10V. Datasheet species that a dnl of 4 LSB. In my application I have masked last 4 bits. So can I say that dnl for my application is 0 LSB ? .
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 (...)
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 dnl,INL and (...)
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 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!
You have 28 codes in your output staircase and therefore 4 missing codes. The step size varies quite a bit between the bottom and the top. Is this a commercial adc or something you designed? If it is a commercial adc you are probably not setting it up correctly. If it is your design, start with probing the reference ladder (one of the major sources
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 !!
The .csv format is not easily read by matlab. You will need to edit the file, remove the first line and replace the comma that separates the time and data with a space or a tab. At this point you can use the load function in matlab (type help load for its syntax). Play around... one more thing,wat's the meaning of this part
Hello All, i'm studying a novel architecture of a Successive Approximation adc based on a charge redistribution DAC for a CMOS Image Sensor, the converter is differentiel. can you plz help me on how to simulate the INL & dnl of this converter? thank you Maalma
hello everyone, i am a beginner at analog circuit design,after reading some basic books and materials, i want to design a 8bit SAR adc, but i do not know how to decide some block's SPEC in it. what i mean is that when you get a whole SPEC about xxx..bit adc, how you get the spec about the component of the adc... for example, 3.3-V, (...)
Hi, Are there a lecture or documents talking about the linearity of Pipelined adc? I know the measurement of linearity of Pipelined adc is INL and dnl. But I want to know more about where the non-linearity effect come from. Thanks for your time. BR, Barry
Hi, I am going to build the simulink models of a Pipeline adc, including SHA, each stage of pipeline adc,clock generation, digital correction. The non-ideal of switched-capacitor opamp should be included. Eventually I can get the plots of INL, dnl, SFDR, SNDR, and ENOB in the Matlab. Is there any examples I can follow? Or where to get more (...)
Hi, I am building a 10 bit pipeline adc using Simulink.I have got the output in steps of 0-1023 at the output.I have used a ramp input as the input signal. Is there a way to perform calculations for SNR,ENOB,SINAD,dnl and INL(theoretical and practical as in using Simulink) for the block in Simulink using the ramp signal. And how do I know whet
Hi All, I have designed a 8 bit SAR adc. (1 LSB ~ 10 mV) In order to test my dnl and INL, I have an outomatic system with ramp input. (The input resolution is ~ 2mV - in order to reduce estimation errors) My typical dnl is ~+/- 0.1 LSB and INL ~ +/- 0.2 LSB. Every adc has a transition noise with an associated (...)
Can you propose any adc with the below spec. 1) Sigma Delta 2) More than or equal to 14bit resolution 3) Should be a single bit output without any internal memory reading. 4) Sampling rate more than 30MHz. 5) Supply Voltage Range Max 5V, Min 1.8V 6) INL, dnl and other parameters does
Hello, 1.Can you help no what factors INL and dnl will depend in Pipelined adc. 2.How to improve dynamic range in pipelined adc. Bye.
You said u saw a non-monotonocity in transfer function of adc. would u like to describe your opinion about it? I have your problem Dear 4S
hello,everyone I have completed a flash adc, and i want to use the matlab to process the data simulated by hspice, so as to get the INL,dnl,SNR,and so on. but i don't know how to do it, can anyone give me an example or some methods to do this? best regarads.
I have an inl & dnl simulation code by Matlab as the attachment, but I think this file isn't effective. Because I have to input sine and ramp signal to get the performance of dynamic (fft) and static (inl & dnl) respectively. By using LA (logic analyzer) in testing adc, we just need to input sine wave andv then get the dynamic and (...)