ADC sampling frequency

[kurtulmehtap]

Hi All,
We have a QPSK modulated signal 700 Mhz IF, 80Mhz BW to demodulate.The bit rate is 100 Mbit, roll-off is 0.65.
Now we have to select an RF-ADC,FPGA board to demodulate it.
The RF part can be handled by an I&Q demodulator circuit.
Our question is; what should be the minimum sampling rate of the ADC's?
What should be their minimum clock frequency?

Thank you.

 

[u7karsh]

you wish to demodulate this signal by using ADC or u have demodulated and then wish to use an ADC? If you have already demodulated the signal, you can then take the sampling rate of ADC as any value above the nyquist rate or twice the maximum frequency present..