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Texas instruments' ADS5400 provides 1 giga sample per second with 12 bit resolution atmel TS83102G0B , AT84AS004 provides 2 giga sample per second with 10 bit resolution. I have not heard an adc that provides 4 giga sample per second if you think direct RF down conversion for 2 GHz signal.
If you think direct RF conversion you can not use it because you should supply sampling rate that is theoretically 2 times of the highest frequency of your signal. But this is theoretically ideal rate. Since our world is not ideal this rate gets a bit higher. For example speech signals are sampled 8 KHz while the highest frequency of speech signal is 3.4 KHz. I guess using 2 giga sample per second ADCs you can direct downconversion RF signals up to 800 MHz. But instead of it you can design a mixer for demodulating RF signal and you can process message signal using ADCs that has lower sampling rate and higher resolution.
Thank you, for your quick reply, i understood the concept, i need a doubt to be clarified,
1. Considering the Sampling frequency, it should be taken twice that of the highest frequency, but in one website it was given that the sampling frequency should be the twice of bandwith used.
Is it , Fs=2*highest frequency or Fs= 2*Bandwidth
2. In my project, i am going to send the gsm frequencies of ranges 890Mhz-960Mhz and 1710Mhz-1960Mhz . So in my case how should i calculate the sampling frequency?
3. How to calculate the sampled points ie. 201,202,203 in the x axis ?
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