Hi, I want to design an ADC with these specifications: Fin = 20MHz BW= 20MHz ENOB > 4 Power consumption P < 1mW Could anyone suggest me some ADC for this kind? I have searched a lot in IEEE but there are only two ADC with SAR ADC and time-interleaved ADC. The ultralow power consumption makes it hard for me to find a architecture. I have little experience about this. Kindly help me.
Just give the different architectures a try. 4 bits are not that many. Start with a flash converter. With 16 comparators and some gates.
Do you know any logic gate (even an inverter) that operates at 20 MHz with < 1mW?? Probably at 0V supply this is possible...
Thanks for the replies! [QUOTE]Do you know any logic gate (even an inverter) that operates at 20 MHz with< 1mW?? Probably at 0V supply this is possible... [/QUOTE] That is what I think too. But I have little experience to talk about that to my boss. Could you give me a convincing reason for that therefore I can pursuade him? I have searched very much but only found two papers that seem appropriate for the requirement. The requirement about power consumption P< 1mW makes it hard for me. I attached two papers that I found. Please kindly advise! http://www.mediafire.com/?bl6bvl3ieesueaa
With such requirements it seems you have a military customer - that I don't like at all. Otherwise your Boss knows nothing about Electronics! For Fin = 20MHz you need at LEAST 60M Samples/s ADC! If you don't want to build your own IC then look for an ADC that you can buy. Whatever power it takes you must have! !! But be aware that you need a high-speed(!) buffer in front of the ADC - that consumes a lot more than the ADC itself !! Try to supply minimal voltage to the converter (~2.5V) and use this for reference also. Look at Analog Devices or Texas Instruments for 4...8 Bit ADC. See what their power consumption is and tell this your boss. You won't be a greater genius than this big companies have! Building something on your own will consume a lot more power. A solution with descrete comparators will consume 16 x comp. + (20?) x logic gates - forget it with 20MHz!!!
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