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目前,模拟宽频带视频信号主要有RGB 信号和高清分量视频信号(YPbPr)量大类。这些信号在使用标准的四对差分对的UTP 传输线来进行长距离传输时会产生信号质量下降的问题。一方面是由于传输的“表皮效应”而产生的非线性的带宽限制,从而导致信号弥散和信号的高频成分丢失。这会使图像的锐度降低,并产生拖尾现象。另外,由于电缆阻抗损耗引起的低频信号衰减会降低图像的对比度。还有,由于双绞线扭曲率的不一致会导致三路差分对的传输线长度的不同,从而使三路接收信号的延时不一致,造成图像出现颜色误差。
为了解决以上几个问题,ADI 公司提出了基于UTP 视频传输的自动补偿系统的参考设计,可以针对这些问题来自动进行EQ 补偿和Skew 补偿。
本视频传输自动补偿系统分为两个部分:发送端(Driver Board)和接收端(Receiver Board)。
具体步骤如下:
视频信号通过VGA接口进入发送端。
将单端的RGB信号调理为差分信号,并将行/场同步信号调制为信号的共模。
然后通过UTP(Unshielded Twisted Pair)线来进行长距离传输。
接收端需要将差分信号转化为单端信号,同时提取行/场同步信号。
在接收端进行EQ补偿和Skew补偿。
视频传输自动补偿系统涉及到的主要器件如下:
AD8147:用于宽带视频的三路差分驱动器
AD8122: 带有可调线路均衡功能的三路差分接收器
AD8120: 三路偏斜补偿视频延迟线
AD9280: 8-Bit, 32 MSPS模数转换器(ADC)
系统框图如下:
电路原理图:
BOM表:
ITEM# | Qty | WW_PN | DESCRIPTION | VALUE | JEDEC_TYPE | TOL | VOLTAGE | WATTAGE | LOCATION | MFG | MFG_PN | HLM_STATUS | STOCKROOM_WL | STOCKROOM_GT | STOCKROOM_LK | DNI | 1 | 1 | 08-a03181b | PCB | ? | ? | ? | ? | ? | ? | Analog Devices Supplied | 08-a03181b | N/A | ? | ? | ? | ? | 2 | 4 | E010138 | CAP CHIP C0G 0603 | 10pF | C0603 | 5 | 50V | ? | C1,C2,C17,C18 | MURATA | GRM1885C1H100JA01D | REL | ? | 40302JH631 | ? | ? | 3 | 31 | E011865 | CAP CER X7R 0603 | 0.1uF | C0603 | 10 | 50V | ? | C3,C5,C7,C8,C10,C12,C14-C16,C22-C26,C29,C30,C32,C45-C49,C52,C54-C58,C61,C64,C65 | AVX | 06035C104KAT2A | PREF | A004-0012-032 | ? | ? | ? | 4 | 1 | E000421 | CAP CER X7R | 0.01UF | C0603 | 10 | 50V | ? | C11 | PHYCOMP (YAGEO) | 2238 586 15636 | REL | A004-0012-004 | ? | 722236 | ? | 5 | 6 | E010382 | CAP MONOLITHIC CER X5R | 4.7uF | C0603 | 10 | 6.3V | ? | C4,C6,C9,C13,C21,C33 | MURATA | GRM188R60J475KE19 | REL | ? | ? | ? | ? | 6 | 2 | E000410 | CAP CER NP0 | 18PF | C0603 | 5 | 50V | ? | C19,C20 | PHYCOMP (YAGEO) | 2238 867 15189 | REL | ADD_TO_STOCK_#23 | ? | 721992 | ? | 7 | 4 | E014683 | CAP MULTILAYER CER X5R | 22uF | C0805H60 | 20 | 10V | ? | C27,C28,C31,C34 | TAIYO YUDEN | LMK212BJ226MG-T | REL | ? | ? | ? | ? | 8 | 3 | E015184 | CAP CER NP0 | 5.6pF | C0603 | 0.1pF | 50V | A004-0012-082 | C35,C37,C43 | YAGEO | CC0603BRNPO9BN5R6 | REL | ? | ? | ? | ? | 9 | 3 | E000409 | CAP CER NP0 | 15PF | C0603 | 5 | 50V | ? | C36,C38,C44 | PHYCOMP (YAGEO) | 2238 867 15159 | REL | ADD_TO_STOCK_#22 | ? | 721980 | ? | 10 | 4 | E000427 | CAP CER X7R | 4700PF | C0603 | 10 | 50V | ? | C50,C51,C59,C60 | PHYCOMP (YAGEO) | CC0603KRX7R9BB472 | REL | ADD_TO_STOCK_#41 | 40302DG689 | 722212 | ? | 11 | 2 | E007959 | CAP ULTRALOW ESR NP0 CHIP C0603 | 47pF | C0603 | 5 | 100V | ? | C62,C63 | AVX | 06031U470JAT2A | REL | A004-0012-077 | 40302DG785 | ? | ? | 12 | 3 | E006992 | CAP MONO CER X5R | 1UF | C0603 | 10 | 25V | ? | C66,C68,C69 | MURATA | GRM188R61E105KA12D | REL | A004-0012-079 | 40302DG762 | ? | ? | 13 | 1 | E014695 | LED BLUE TSS TYPE SM | LNJ912W8CRA1 (blue) | LED0603-2 | N/A | 2.9V | ? | D1 | PANASONIC | LNJ912W8CRA1 | REL | ? | ? | ? | ? | 14 | 1 | E007144 | LED RED SURFACE MOUNT | LNJ212R8ARA (red) | LED0603 | N/A | 1.72V | ? | D2 | PANASONIC | LNJ212R8ARA | REL | A002-0004-027 | ? | ? | ? | 15 | 1 | E014696 | LED GREEN TSS TYPE SM | LNJ312G83RA (green) | LED0603-2 | N/A | 2.03V | ? | D3 | PANASONIC | LNJ312G83RA | REL | ? | ? | ? | ? | 16 | 3 | E014729 | DIODE SCHOTTKY HP | HBAT-540C | SC-70-3 | N/A | 30V | 825mW | D4-D6 | AVAGO TECHNOLOGIES | HBAT-540C | REL | ? | ? | ? | ? | 17 | 2 | E011938 | INDUCTOR FERRITE BD | 100OHM | L0603 | N/A | ? | ? | E1,E2 | TDK | MPZ1608S101A | REL | ? | ? | ? | ? | 18 | 1 | E000815 | CONN-PCB HEADER 3 POS | MOLEX22-23-2031 | CNMOLEX22-23-2031 | ? | ? | ? | J1 | MOLEX | 22-23-2031 | REL | A012-0003-150 | 40313JH205 | ? | ? | 19 | 1 | E014143 | CONN-PCB UNFILTERED MOD JACK | RJ45-8X | CNTYCO-RJ45 | ? | ? | ? | J2 | TE CONNECTIVITY | RJ45-8X | REL | ? | ? | ? | ? | 20 | 1 | E014687 | CONN-PCB HEADER LOW PROFILE | 5103308-5 | CNHDR2X10H393 | ? | ? | ? | JP1 | TE CONNECTIVITY | 5103308-5 | REL | ? | ? | ? | ? | 21 | 3 | E014718 | INDUCTOR CHIP COIL | 150nH | L0603 | 10 | ? | ? | L1-L3 | MURATA | LQM18NNR15K00D | REL | ? | ? | ? | ? | 22 | 1 | E014809 | CONN-PCB RCPT SIZE 1 RA W/ 2 GND | 1-1734530-1 | CNTYCO1-1734530-1-2 | ? | ? | ? | P1 | TE CONNECTIVITY | 1-1734530-1 | REL | ? | ? | ? | ? | 23 | 3 | E014685 | TRANS N-CHA ENHANCE MODE FET | 2N7002 | SOT23 | ? | 60V | 200mW | Q1-Q3 | FAIRCHILD SEMICONDUCTOR | 2N7002 | REL | ? | ? | ? | ? | 24 | 4 | E010479 | RES PREC THICK FILM CHIP 0603 | 33.2 | R0603 | 1 | 1.822V | 1/10W | R1,R2,R5,R6 | PANASONIC | ERJ-3EKF33R2V | PREF | A003-0032-107 | 41816JH1178 | ? | ? | 25 | 3 | E004249 | RES FILM SMD 0603 | 680 | R0603 | 1 | ? | 1/16W | R9-R11 | MULTICOMP | MC0603WGF6800T5E-TC | REL | A003-0032-125 | 41816DG1426 | 911-215 | ? | 26 | 4 | E003671 | RES PREC THICK FILM CHIP R0603 | 10K | R0603 | 1 | ? | 1/10W | R8,R12-R14 | PANASONIC | ERJ-3EKF1002V | PREF | A003-0032-006 | ? | FEC 911-355 | ? | 27 | 2 | E013393 | RES PREC THICK FILM 0603 | 4.75K | R0603 | 1 | ? | 1/10W | R16,R17 | PANASONIC | ERJ-3EKF4751V | PREF | ? | ? | ? | ? | 28 | 6 | E003702 | RES PREC THICK FILM CHIP R0603 | 75 | R0603 | 1 | ? | 1/10W | R18-R20,R52-R54 | PANASONIC | ERJ-3EKF75R0V | PREF | A003-0032-052 | 41816JH1684 | ? | ? | 29 | 1 | E014719 | RES COMPACT THICK FILM CHIP | 110K | R0603 | 1 | ? | 1/10W | R21 | ROHM | MCR03EZPFX1103 | REL | ? | ? | ? | ? | 30 | 1 | E013527 | RES PREC THICK FILM 0603 | 23.2K | R0603 | 1 | ? | 1/10W | R22 | PANASONIC | ERJ-3EKF2322V | PREF | ADD_TO_STOCK | ? | ? | ? | 31 | 7 | E003673 | RES PREC THICK FILM CHIP R0603 | 49.9 | R0603 | 1 | ? | 1/10W | R23-R25,R27,R28,R30,R59 | PANASONIC | ERJ-3EKF49R9V | PREF | A003-0032-008 | 41816DG314 | ? | ? | 32 | 5 | E003668 | RES PREC THICK FILM CHIP R0603 | 100 | R0603 | 1 | ? | 1/10W | R26,R29,R31,R55,R56 | PANASONIC | ERJ-3EKF1000V | PREF | A003-0032-003 | 41816DG308 | FEC 911-112 | ? | 33 | 1 | E011171 | RES PREC THICK FILM CHIP 0603 | 22.1 | R0603 | 1 | ? | 1/10W | R3 | PANASONIC | ERJ-3EKF22R1V | PREF | A003-0032-038 | ? | ? | ? | 34 | 1 | E005803 | RES CHIP SMD WW PREC POWER | 0 | R0603 | N/A | ? | N/A | R32 | VISHAY | CRCW0603000ZRT1 | REL | ADD_TO_STOCK400 | ? | ? | ? | 36 | 1 | E014668 | RES COMPACT THICK FILM CHIP | 475 | R0603 | 1 | ? | 1/10W | R38 | ROHM | MCR03EZPFX4750 | REL | ? | ? | ? | ? | 37 | 1 | E003681 | RES PREC THICK FILM CHIP R0603 | 22.1K | R0603 | 1 | ? | 1/10W | R4 | PANASONIC | ERJ-3EKF2212V | PREF | A003-0032-016 | 41816DG287 | ? | ? | 38 | 3 | E003678 | RES PREC THICK FILM CHIP R0603 | 1K | R0603 | 1 | ? | 1/10W | R40,R41,R43 | PANASONIC | ERJ-3EKF1001V | PREF | A003-0032-013 | 41816DG207 | FEC 911-239 | ? | 39 | 2 | E014667 | RES PREC THICK FILM CHIP | 2.2K | R0603 | 1 | ? | 1/10W | R42,R45 | PANASONIC | ERJ-3EKF2201V | REL | ? | ? | ? | ? | 40 | 3 | E003691 | RES PREC THICK FILM CHIP R0603 | 150 | R0603 | 1 | ? | 1/10W | R46,R48,R49 | PANASONIC | ERJ-3EKF1500V | PREF | A003-0032-032 | ? | FEC 911-136 | ? | 41 | 3 | E008050 | RES THICK FILM CHIP 0603 | 453 | R0603 | 1 | 75V | 1/10W | R47,R50,R51 | VISHAY | CRCW0603453RFKEA | REL | A003-0032-112 | 41816JH1395 | ? | ? | 42 | 2 | E016982 | RES PREC THICK FILM CHIP | 41.2 | R0603 | 1 | ? | 1/10W | R57,R58 | PANASONIC | ERJ-3EKF41R2V | REL | ? | ? | ? | ? | 43 | 1 | E004235 | RES FILM SMD 0603 | 39 | R0603 | 1 | ? | 1/16W | R7 | MULTICOMP | MC 0.063W 0603 1% 39R. | REL | ADD_TO_STOCK_182 | ? | 911-069 | ? | 44 | 1 | E014711 | SWITCH TACT SPST NO | PTS645SM43SMTRLFS | SWSMSQ236H169 | ? | ? | ? | S1 | C&K | PTS645SM43SMTRLFS | REL | ? | ? | ? | ? | 45 | 7 | E005891 | CONN-PCB SMT TEST POINTS | 5015 | CNKEY5015TP | ? | ? | ? | TP1-TP7 | KEYSTONE ELECTRONICS CORP | 5015 | REL | ADD_TO_STOCK3 | ? | ? | ? | 46 | 1 | E011916 | IC-ADI 8-BIT, 32 MSPS, 95mW CMOS A/D CONVERTER | AD9280ARSZ | SSOP28 | ? | ? | ? | U1 | ADI | AD9280ARSZ | REL | ? | ? | ? | ? | 47 | 1 | E014686 | IC-ADI CMOS, H-SPEED, R-R OPAMP | ADA4891-3ARUZ | TSSOP14 | ? | ? | ? | U2 | ADI | ADA4891-3ARUZ | REL | ? | ? | ? | ? | 48 | 1 | E014670 | IC MCU ARM 32BIT 16K FLASH | STM32F103C4T6A | LQFP48 | ? | ? | ? | U3 | ST MICROELECTRONICS | STM32F103C4T6A | REL | ? | ? | ? | ? | 49 | 1 | E011460 | IC-ADI TRIPLE SKEW-COMPENSATING VIDEO DELAY | AD8120ACPZ | QFN32_5X5_PAD3_5X3_5 | ? | 5V | ? | U4 | ADI | AD8120ACPZ | REL | ADD TO STOCK | N/A | N/A | ? | 50 | 1 | E012587 | IC-ADI CMOS LOW QUIESCENT CURRENT | ADP125ARHZ-R7 | MSOP8_PAD2_16X1_73 | ? | 2.3V TO 5.5V | ? | U5 | ADI | ADP125ARHZ-R7 | REL | ? | ? | ? | ? | 51 | 1 | E014007 | IC-ADI 40QFN PRELIM | AD8122 | QFN40_6X6_PAD4_6X4_6 | ? | ? | ? | U6 | ADI | AD8122 | RWC | ? | ? | ? | ? | 52 | 1 | E014684 | IC CRYSTAL FOR CLK OF IC | 8MEGHz | YSML500W200H181 | ? | ? | ? | X1 | EPSON TOYOCOM | MA-505 8.0000M-C0:ROHS | REL | ? | ? | ? | ? |
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