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Recent content by tiportoolmo

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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC - help needed I have a littel problem,i want to do the same analysis as in the attachment..but to da that I need a 5-bit ideal DAC. Someone has a verilog-A code of a 5 bit ideal DAC?
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC Please can you explain me using an example? thanks
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC Thanks for all your replies! In order to check the SNDR I have to put an ideal DAC at the output of the ADC, isnt'it?
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC Thanks Joannes for your replies. Now I show you my simulations: InPreamplifier shows the differential oputput of the T/H circuit and Vref+ - Vref- OutComp2Differential shows the output of the second stage comparator. It's the same of (vop_c10 -von_c10)...
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC Really the simulations show the difference between Vop_c10 and Von_c10. I mean, (vop_c10 - von_c10) and not the single value of vop_c10 and von_c10 which are not represented. Maybe I found a solution: the single output vop_c10 drives two stage of inverters to...
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC Thanks for help. To be more detailed I show you this file. It's a power point presentation of the previous pdf file. At the end there are the outputs of the preamplifier,first comparator and second comparator. I have obtained the same results and as you can see the...
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC do you mean I have to use cml logic for the encoder because it's more suitable at high speed and also because the input is differential?
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    Flash ADC - Which are the inputs of the ENCODER

    Re: Question about Flash ADC sorry I didn't understand..can you explain me in more details? In order to drive the encoder it's correct to do this operation: (Vout+ - Vout-), where Vout+ and Vout- are the outputs of the second stage comparator? Reading the pdf file seems that it's the right...
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    Flash ADC - Which are the inputs of the ENCODER

    I'm designing a full Flash ADC , my project is similar to that one presented in "adc 4 bit.pdf". I have simulated all the stages and I obtained the same results..Now the problem is: Which are the inputs of the ENCODER? I mean,if you look to the pdf file,in the first page,section II.System...
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    CML comparator in 65nm CMOS - design rules

    CML comparator Hello everyone. I need to design this circuit for a full flash ADC 4 GS/s in 65nm CMOS. There are some rules to do that? for example, how can I choose W, I bias and Rload for this circuit? please, I need a big help. circuit:
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    Some questions about flash adc

    sorry but I have other questions: In this scheme what does mean Vin+ and vin-? Can you explain me with an example? i'm simulating the Track and Hold with pspice student,how can I calculate the HD3 and SNR with Pspice? thanks all
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    Some questions about flash adc

    yes sure!Thanks and about the value of 1 LSB? 1 Lsb= (+VREF - VREF-)/2^N, ?
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    Some questions about flash adc

    so Vref+ and -vref are indipendent by the input signal? they depend only by the common mode voltage,Vss and Vdd?
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    Some questions about flash adc

    ok, but if the wave doesn't have negative value,I have to use onlly Vref? in the case the wave has this form, how can I choose Vref+ and Vref-? Which is the value of 1 LSB if the resolution is 5 bit?
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    Some questions about flash adc

    Hi all, I'm designing a full flash adc,5 bit, 4 GS/s. I have a big doubt about the choise of Vref. in many papers i saw that there are Vref+ and Vref-, why? for example if the input is a sinewave Asin(2*pi*fin*t) with A=1V, power supply is 1.2 V, How can i choose Vref+ and Vref-? In this...

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