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发表于 2007-12-6 11:54:10
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要20bit 又80Mhz, 這真的很難
true 20bit (SNR~=120dB) with 96kHz 已經很難了
if sigma-delta is used, the OSR should be at least 32, in 4th order SDM, so
the sampling clock can be as high as fs=32*80M=2520MHz,,, and then the UGB of OP should be 5*fs=12.6GHz
it's impossible...
except u can use higher order SDM, like 5th or 6th... |
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