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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 Obviously SD-adc have superseded other topologies in the low and medium speed range, you are taking the dataconversion "main ro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 (...)