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sampling F & IF chosing

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david753

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I am designing a BPSK decoder.
The BW is 2MHZ.
Rf is 3GHZ.
I'd like to down the RF freqency to IF, and then sampling by AD converter.
How do I chose the correct IF and SAMPLING freq?
 

Hi,
first determine whether you need a single stage or multistage down conversion.
If it is twosatge be aware of the filters and their charcteristics (esp first stage).

For single stage,
assume you want an IF of 25 MHz (not too low or too high) you can calculate the corresponding LO.

You can choose a sampling frequency of 6MHZ which is good. You need to work out the spectrums.
B R M
 

Hi,

IF frequency is a system design issue:
1. Multiple channels or single channel
2. image frequency location and power
3. real downconversion or complex downconversion
4. sampling frequency requirement
5. available parts
6. ADC input characteristic

sampling frequency is basically determined by signal BW.

Choosing these parameter is not a simple question and need system planning. Good luck
 

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