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100Base-TX receiver: ENOB 5.5bit (實作6bit) 125Msps ADC
9 L1 E& Y) q. N% E ]7 \# V1000Base-T receiver: ENOB 7.0bit (實作8bit) 125Msps ADC
* j0 K- |7 Q1 J10GBase-T receiver: ENOB 9.5bit (實作10bit) 625Msps ADC (625 system)
5 C7 m, ?4 D; V! ]0 d+ m% t% v, u# _10GBase-T receiver: ENOB 9.5bit (實作10bit) 833Msps ADC (833 system, 目前這個贏面較高)
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100Base-TX transmitter: [MLT-3] 3 level 1.50Vpp 125Msps DAC* [+ v/ Q& S% [# x, n N1 u* O# A
1000Base-T transmitter: [PAM-5] 5 level 2.00Vpp 125Msps DAC
' h) W9 M( ^' m10GBase-T transmitter: [PAM-20] 20 level 3.14Vpp 625Msps DAC (625 system)
- e' z. r' v2 s( }: [10GBase-T transmitter: [PAM-10] 10 level 3.14Vpp 833Msps DAC (833 system, 目前這個贏面較高)
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! C s/ ` N( K5 t換言之, 有辦法搞出 ~GHz 的10bit AD 及 DA 才有10GBase-T 的入場券,% i8 V! A& E m# G8 Y# Q
一下從125MHz 跳到 ~GHz... 真是令人n條斜線都跑出來了, 我看國內有% _4 ^# C0 g, R) @0 r) m7 Q" M
near GHz AD/DA 的大概只有MTK DVD-RW set的RF front end, 不過那也是6bit左右matching的東東,# _* f6 q3 |3 D6 {( J
這規格要求的是9.5bit matching at 833MHz, 真的搞出來就改行做GHz示波器/AWG算了, 毛利還比較高哩. |
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