letting more of the world through the front door. Saturation is saturation and there is only 2 ways to avoid it. Roofing filter or attenuator which raises the noise floor.
It will be interesting to see what the future brings......
maybe we will go back to tuned preselectors..gfz
dharmaBum <[EMAIL PROTECTED]> wrote:
Using a wideband ADC (the 16 bit, 130 MSPS/sec, LTC2208 for example)
seems like a poor choice for a narrow band radio compared to the
simpler, cheaper and less power hungry Tayloe mixer approach. Of
course, there is something very satisfying to a purist about the
direct "antenna to bits" approach.
Can anyone help answer the following questions:
1. Which DDS has the best spur performance: AD9952 (14 bit DAC) or
the AD9958 (10 bit DAC)?
2. What exactly is legal status of the Tayloe mixer? Motorola owns
the patent (US # 6230000). There may be a great deal of prior art
that might render the patent without merit but I don't want to get
sued over a hobby. Did Flex-Radio license this patent from Motorola?
3. I'm still confused about how to calculate/estimate SNR, blocking
dynamic range and arrange gain distribution for a wideband ADC based
radio. Can someone point me to reference or use the previously
mentioned LT2208 as an example for a 3 KHz channel.
Thanks for any help or insights...
Wayne
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