digital mixer design for software defined radio

[sssliz]

haiii
:--( can anyone help us with vhdl or verilog code for digital mixer plzzzz???

 

[joelby]

What have you managed to write so far?

 

[sssliz]

hai...input to the mixer comes from ADC and NCO....we have'nt strdt doin it as we didn find ny information abt digital mixer....

 

[FvM]

Available options are double side-band mixer (simply a signed multiplier) or single sideband mixer (quadrature modulator). A digital imlementation should be more or less obvious, I think. Otherwise, there's a lot of literature about SDR on the internet.

 

[mrflibble]

If by digital mixer you mean multiplying mixer, I guess you could always try ... multiplying.

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Code Verilog - [expand]
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always @(posedge clk)
   mixer_out <= adc_stuff*nco_fluff;

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There we go. Anything more falls outside the detail level of your specs. Problem solved.

And I wasn't going to be the first to point it out, but since FvM already did, I'll be the 2nd to point it out. Google? When I was looking for gps sdr implementations (which is a narrower field than random generic anything SDR as per your question) I had no problem finding boatloads of information. So google is your friend.