Selecting a IQ demodulator for a SDR

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pisoiu

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I am trying to design a SDR USB stick to cover 0-200mhz range. I have some troubles with selecting a proper IQ demodulator for this range, can anyone recommend a suitable IC or a combined solution (demodulator+VGA, etc). Many of iq demods from Analog Devices or Linear does not cover this range, they are dc-50mhz or those which cover higher frequencies does not cover DC.
Thank you in advance.

/pisoiu
 

I doubt you'll find any single chip solutions that cover that range.

How are you planning on generating an LO with such a large range? A DDS? If so you could use a dual channel DDS (AD9958) and generate quadrature LOs directly, then you just need a couple broadband active mixers (I know analog makes a couple).
 
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    pisoiu

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The main problem with starting freq. is that I want to cover ham bands below 10mhz, 160, 80 and 40m. Thanks for suggestion.
 

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