资料介绍
时钟与数据恢复电路CDR CDR CDR CDR (CDR)
CDR 1 ( CDR b1 b2 b3..bn) n x ft ( (BER) Reed-Solomon EMI 8B10B CDR ) ft n ft CDR (FEC)
FR-4 CDR CDR ( )
CDR BER / ( CDR SerDes )
TRANSMITTER
CHANNEL
RECEIVER
bn
DESERIALIZER
SERIALIZER
b1 b2 b3 b4
b1 b2 b3 b4
bn
1.
8
PD VREF
LPF
VCO
1/n VCO 1
2 DEC
PLL
1/n
2.
PLL
/
) VCO LPF VCO 3 / CDR (PD) (VCO) PD (1/n) VREF PLL (n) VREF VCO / ±50ppm ±50ppm ±50ppm ( VCO ) VCXO CDR LPF (PLL) 2 1 PLL PLL (VCXO)
(FR-4
-
(LPF) VCO
SONET ( 3 3E 4) PLL CDR PLL 3 PLL (DEC) / LPF
-
PLL VCXO)
VCO (
DEC
DATAout
CLK/DATAin
PD
LPF
VCO
CLKrec
3.
PLL
CDR
9
/ )
CDR
CDR ( ( CDR VCXO VCXO 24
(LOS) (V REF) ±4.6ppm)
/
VCO/VCXO 4 VCO/VCXO
/ / TCXO 10MHz 10GHz GSM OC- 192 CDR
VCO VCO
VCXO VCO VCXO / /
DEC
DATAout
CLK/DATAin
PD
VCO
CLKrec
LOCK
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