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ADC for GNSS applications

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Osawa_Odessa

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Hi,
I have given a project in which I need to design an ADC for GNSS (Global Navigation Satellite System). Here are some of specifications of the ADC.
  • input frequency fin = 20MHz
  • Bandwidth = 20MHz
  • Power consumption P <= 1mW
  • ENOB >= 3.7
  • Resolution: 4 bits
I am confused which sampling frequency should I choose?
I know it has to be larger than two times highest frequency component but I don't know which frequency optimistic, 40MHz, 60MHz, 80MHz, 100MHz, or larger.
And what type of ADC is more appropriate for this application?
 

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