ADC based on an FPGA

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Hello to all of you.
Although there is a plenty of cheap analog to digital conveters of any bit resolution,as a good starting point getting started with fpga is to make an ADC.
Making one bit DAC of any resolution is very simple,with an external opamp of good quality and high accuracy of a reference voltage this makes me think that high resolution of an ADC can be obtained.
As a moment experimenting to get familiar with verilog-i dont have the fpga board yet,but soon i will have it.
The project is just for fun and knowledge and my purpose is to get 16bits or even better.
The question is am i hunting ghosts-i live on earth, not in outer space and please not be be consider me as an arrogant.(just for knowledge regardless the result-only what to expect).

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The usual approach is a high-performance ADC, like those made by Linear Technology. They can downsample signals up to 750 MHz and are often used in software-defined radios.

Leon Heller G1HSM

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Well most microcontrollers nowadays have built-in comparators.

There is even a Microchip appnote how to make a sigma-delta ADC with the built-in comparator, two resistors and one capacitor.