【经验】广播电视调谐芯片Si2151接收ATV 48.25MHz出现斜纹干扰的调试方法

时间： 2020-08-04 来源：世强

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SILICON LABS的广播电视调谐芯片 Si2151是一颗数模一体的电视信号调谐芯片，在广播接收领域得到了广泛的应用。最近有客户在使用Si2151接收ATV信号时发现搜到48.25MHz的频点后信号强度为40dBμV的时候画面出现斜纹干扰，斜纹干扰的画面如下图所示。一般出现斜纹干扰的原因是在RF信号中视频信号的频点附近出现了干扰信号导致，下文会围绕斜纹干扰的问题分享解决经验。

遇到斜纹干扰，首先要找到干扰源，所以笔者使用频谱仪来测量Si2151的IF输出，可以看到在下图的IF的频谱中视频信号旁边有一个强度比较小的信号，疑似是干扰信号（为了便于观察需要在观察频谱的时候，将RF信号的调制关闭）。

将视频信号这一部分频谱放大后可以清晰的看到在视频信号右边多了一根干扰信号。测量干扰信号和视频信号的频率差为0.25MHz。由于IF信号是RF信号的镜像，所以IF上的干扰信号的频率比视频信号的频率大0.25MHz，则实际的RF信号中的干扰信号的频率比有用信号的频率小0.25MHz 。即干扰信号频率=48.25MHz-0.25MHz=48MHz。

48MHz的干扰信号，有可能是SI2151的24MHz晶体的两倍频。为了确定干扰信号是不是来自于24MHz晶体的两倍频，所以修改SI2151的软件将property 0x0402 CRYSTAL_TRIM的默认参数更改为4p7F，此时晶体的频率偏移，与有用信号的距离变化，画面斜纹消失，说明48MHz确实是24MHz晶体的两倍频引起的干扰。

确定了干扰源后我们一般会有两个思路来解决：一是消灭干扰源，显然按照上面的方式将24MHz晶体频率调偏可以得到改善，但是可能会让晶体超出频偏范围，引起其他的问题，所以我们可以用软件在搜索到48.25MHz的频点后做一个判断，播放48.25MHz时用上面的命令将24MHz晶体的频率调偏，除此之外播放其他频点时保持默认值不变。第二种方法是更改料件或者PCB走线，减短晶体引脚到芯片的走线距离，采用较小包装的晶体，在客户有改版机会的情况下建议客户采用第二种方法，从更根本上解决该问题。

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2016年01月01日 - SILICON LABS - 培训文档-商品应用及供应商介绍代理服务技术支持现货查询批量订货

Silicon Labs Quality and Reliability Report First Quarter 2021

型号- EFM8X,BGM12X,SI2167-BXX,EFR32MG1V1X,SL2309,SI539X,SI2166-DXX,SI2169-X,TSM96XX,SL38020,SI1102,SI2433,C8051F2XX,C8051F39X,SI2436,SI5225X,SI2438,SI484X,SI5384X,SI2437,SI5372X,TS3001,TS3002,SI242X,SI2439,TS12XX,TS3003,TS3004,TS3005,CP213X,TS3006,EFR32MG14PX,EFM32LG,ZM51X,IAP6XX,SL2304,SL2305,SI49XX,CP2102N,CF0XX,EFM32GG3X,SI2167-AXX,SI2166-CXX,IAP87X,SI2168-X,SI1120,SL16XX,SI2456,SI47XX-B1X,SI47XX-C3X,C8051F1XX,EFM32TG110X,SI5382X,SI220X,SI474X,CP211X,TS6XXX,WF200,TSM60XX,SI5310-C,SI3291X,CYWXXX,SI1132,IAP7XX,SI1133,CP2120,SI221X,SI100X,SI5383X,CF1XX,EFM32JG,SI475X,SI5371X,CF38X,EFM32GG8X,SI5339X,SL28PCIE50,SL188X,TSM98XX,SI2166-BXX,CTXXX,SI828X,SL2874,SI804X,SI5380X,SI7060X,C8051F4XX,TS1005,TS1004,C8051F35X,SI47XX-B3X,TS1003,TS1002,CP2107,TS1001,CP2105,CP2104,EZR32X,SI3404X,CP2109,CP2108,SIM3XXXX,SL2861,SI805X,SL2864,IAP4XX,SI2401,SI2400,SI47XX-B2X,SI2403,CP2103,EFM32HG,CP2102,CP2101,SI47XX-C4X,C8051F36X,CF2XX,CF39X,SI5381X,SI4709,CF36X,SI3407X,SI4708,TS7XXX,S3UX,SL28PCIE30,CP254X,SI2166-AXX,TSM97XX,SL3816,SL2850,SI470X-C19,SI806X,SI4830,SL2854,SI4834,SI2535,C8051F37X,SI4836,CF37X,CP26XX,SI3406X,SI482X,EFM32GG9X,EFM32TG2X,C8051TXXX,C8051F38X,CF34X,EFR32MG13P8X,SI5328,TS1005SL28EB717,SI5327,SI5326,SI5325,SI5324,SI5323,SI53102,SI5322,SI824X,SI5211X,SI5332X,C8051F31X,EFM32G2X,SI5320X,EFR32FG1X,SL28SR,SI703X,SL3800,SI2417-E,SL151,CF4XX,SL153,CF35X,SI2417-D,EFM32TG108X,SL28EB636,SI483X-B,SL158,SI2493-D,SI2493-C,SI53108,C8051F32X,SI2164-X,SI83XX,SI53106,SI825X,51X,SL28EB742,CF32X,EFR32MG13P6X,SI2404-D,IA14XX,SI2404-C,SL28EB745,TSM99XX,SL28EB740,C8051F33X,SI3050-D,SI5321-H,SI3050-E,SI5330X,RM2,SI826X,C8051F5XX,SI3228X,CF5XX,SL28EB731,CF33X,EFR32MG13P7X,SL28EB735,SL23EP,SI2163-X,C8051F34X,SI5331X,SI827X,SI803X,53X,EFR32FG2X,TS9XXX,SI3229X,SI2167-DXX,CF30X,CPTXXXX,SI5376X,C8051F8XX,SI7008,SI7007,SI7006,SI7005,54X,SL28770,SL28EB797,SL28773,SL28774,SL28775,CF31X,SL28776,SL28779,SI3226-X,55X,CP4000,SI241X-B,SI2167-CXX,SI241X-C,IA12XX,SI241X-A,BM11X,SI241X-H,SI241X-F,SI241X-G,SL28EB781,C8051F7XX,SI822X,SI50122,SI5374X,EFR32Z,SI701X,56X,EFR32MG1P7X,EFM32GG2X,EFR32R,SI2457-FT,SL28EB774,CF7XX,WFM200,SI2165-X,SI823X,SI5375X,C8051F30X,57X,SI702X,SI84XX,BGM11SX,CP22XX,EFM32GG1X,TSM12XX,ZW0X,SI307X,500X,BGX13S22GX,CF8XX,SI479XX,EFM32TG11BX,SI41XX,SI87XX,SI308X,59X,SI8SX,SI502X,EFR32MG1P6X,SI2160-X,SI405X,SI8273-D-IDI,TSAXXXX,EFPX,IA10XX,EFM32ZG,C8051F9XX,SI854X,SI406X,SL38160CZC-30B,SI2435-E,SL15300EZC-70,SI2435-F,SI72X,CF9XX,SI2435-C,SI2435-D,EFM32G8X,SI86XX,SI504X,SI2435-B,SL15300EZC-75,EFR32MG1B6X,SI3226X-C,SL28EB721,SL15100CZC-1,SL28EB720,SL28EB725,BGM220SX,IA32XX,SI2191,EFR32MG1P1X,SI2190,SI53019,S3CX,SI2196,EFR32BG1X,SI436X,SI5336X,SL28EB719,SI5301C,SL28EB717,EFR32MG1B7X,IAP90X,SI2415-D,SI53212X,SI5338X,RWM3,SI216XX-X,SI2162-X,SI3052,EFR32MG1P2X,SI3054,SI5216X,SI3056,SI510X,SI534X,SI401X,ZGM,MGM13SX,SI5364,SI5365,SL28PCIE2,SI5368,SI31XX,SI535X,SI5369,SI5366,SI5213X,SI5367,SI5334X,SI402X,SI511X,EFR32MG2X,SI850X,EFM32PG2,EFM32WG,SI5311X,EFM32G3X,SI5013,EFR32BG2X,SI5010,SI88XX,SD35X,SI306X,SI403X,SL28DB,SI2161-X,SI5214X,SI5335X,SI512X,EFM32PG1,SI851X,SL281XX,TSM92XX,SI3219X,SL28PCIE10,CP240X,IAP93X,SI705X-A20,SI2151,SI2150,SI2153,SI3000,SI2155,BGM13S3X,SI2157,SI117X,SI2156,SI2159,SI3006,SL28PCIE19,SI2158,SI3005,SI347X,SI432X,SI892X,SI3008,SI3007,EM26X,SI3009,SL28PCIE16,EFR32MG1B1X,SI5386X,SL28PCIE14,SI3218X,CY2815,SI3011,SI3010,SI3012,SI118X,SI3015,SI348X,SI106X,SI3014,SI324X,SI3017,SI433X,SI5317,SI3016,SI3019,SI3018,SI445X,SI5316,EFR32MG1B2X,BGM13S22FX,EM25X,SI5319,IAP91X,TSM91XX,CP250X,EFM32TG8X,SI2171,SI2170,SI2173,SI2172,SI2177,SI2176,SI2178,SI446X,SI5315X-A,SI5388X,SI5315X-C,TS3300,SI3402X,SI2180,SI2182,SI705X-A10,SI2181,SI5409X,SI2183,SI2185,SI108X,SI302X,SI435X,SL28PCIE06,EM35X,SI3239X,SI2111,SI2113,C8051F0XX,SI2115,SI476X,SI210X,SI101X,EM34X,SI5221X,TS4XXX,SI2434-D,SI2457-D,TS331X,SI2457-C,IAP86X,EFR32MG12PX,SI3450,SI4780,SI3453,SI3211,SI3452,SI3210,BGX220S2,SI2124,SI3455,SI3454,SI3457,SI3215,SI477X,SI2434-C,SI3456,SI114X,SI2128,SI3459,SI5389X,SI2127,SI102X,SI3216,SI3458,SI320X,SI4732-AXX,SI5220X,SL15300DZC-56,SI3217X,TSM93XX,SI4430,SI2494,SI3220,SI4312,SI4313,SI4310,SI4431,SI4311,SI4432,SI2137,SI115X,SI2136,SI3225,SI35XX,SI4438,SI103X,SI2138,SI3227,SI890X,SI442X,TS11XX,EM31X,SI47XX-D,SI8271-D-IDI,SI2140,SI2141,SI3230,SI2144,SI3233,SI2143,SI3232,SI2146,SI2145,SI2148,SI346X,SI2147,SI46XX,SI3238,SI8271-D-YDI

14-Apr-2021 - SILICON LABS - 测试报告 - Rev No 01 代理服务技术支持现货查询批量订货

Si2151 RoHS (SGS) Test Report

型号- SI2151

SILICON LABS - 测试报告代理服务技术支持现货查询批量订货

Silicon Labs（芯科科技） Si2151全球数字和模拟电视调谐器的数据手册（中文）

型号- SI2151,SI2151-A10-GM,SI2151-A10-GMR,SI21X1

2014年09月29日 - SILICON LABS - 数据手册代理服务技术支持现货查询批量订货

180405276 Si2151/41 Programming Guide Revision 1.0

型号- SI2151,SI2141-A10-GM,SI2141-A10-GMR,SI2141,SI2151-A10-GM,SI2151-A10-GMR

4/5/2018 - SILICON LABS - 产品变更通知及停产信息代理服务技术支持现货查询批量订货

在USB Dongle中使用视频调谐器Si2141，请问视频调谐器Si2151与Si2141的区别是什么？

视频调谐器Si2151是Hybrid Tuner，即模拟数字混合一体的视频调谐器，而视频调谐器Si2141是only digital Tuner，即纯数字视频调谐器。因此可根据具体需求进行选择。

2017-05-09 - 技术问答

混合电视调谐器Si2151作为ATV模拟电视接收时，后端采用什么解码芯片？

Si2151 TUNER支持ATV/DTV接收，输出LIF低中频信号，此中频信号再提供给后端的DEMOD来完成解码/解调工作。目前市场上已经没有单独的ATV DEMOD产品，所有主流TV SoC都支持ATV解调功能，比如：MTK，MSTAR，Realtek，Sunplus。如果没有合适的SoC来解调ATV信号，可以使用Si2177，支持ATV完整接收输出CVBS/MONO AUDIO或者SIF第二中频伴音信号，以及DTV TUNER功能。

2017-06-20 - 技术问答

17062992 Si2136-46-56-76-B30-GM EOL

型号- SI2141-A10-GMR,SI2177-A30-GMR,SI2146-B30-GMR,SI2177-A30-GM,SI2176-B30-GMR,SI2136-B30-GMR,SI2151-A10-GM,SI2151-A10-GMR,SI2176-B30-GM,SI2141-A10-GM,SI2156-B30-GM,SI2156-B30-GMR,SI2137-A30-GM,SI2137-A30-GMR,SI2136-B30-GM,SI2146-B30-GM

6/29/2017 - SILICON LABS - 产品变更通知及停产信息代理服务技术支持现货查询批量订货

能提供电视调谐器Si2151完整的datasheet吗？

只要签订了NDA协议，电视调谐器Si2151的完整数据手册是可以提供的，如有需要请通过400-887-3266联系世强。在这之前您可以查阅Si2151简单版数据手册，下载地址：http://www.sekorm.com/doc/49098.html

2017-07-05 - 技术问答

Si2151 全球数字和模拟电视调谐器

型号- SI2151

9.29.2014 - SILICON LABS - 技术文档代理服务技术支持现货查询批量订货查看更多版本

Silicon Labs（芯科科技）2019年第四季度质量和可行性报告

描述- Quality and Reliability Report Fourth Quarter 201

型号- EFM8X,BGM12X,SI2167-BXX,SL2309,EFR32MG1V1X,SI539X,SI2166-DXX,SI2169-X,SL38020,TSM96XX,SI1102,SI2433,SI2436,C8051F2XX,C8051F39X,SI5225X,SI5384X,SI484X,SI2438,TS3001,SI5372X,SI2437,TS3002,TS12XX,TS3003,SI242X,SI2439,TS3004,TS3005,TS3006,CP213X,EFR32MG14PX,EFM32LG,IAP6XX,SL2304,SL2305,SI49XX,BGM11X,CP2102N,EFM32GG3X,CF0XX,SI340X,SI2167-AXX,SI2166-CXX,IAP87X,SI2168-X,SI1120,SL16XX,SI47XX-B1X,SI2456,SI47XX-C3X,C8051F1XX,SI5382X,EFM32TG110X,SI474X,SI220X,CP211X,TS6XXX,WF200,TSM60XX,SI5310-C,SI3291X,CYWXXX,SI1132,IAP7XX,SI1133,CP2120,SI221X,SI5383X,SI100X,SI5371X,SI475X,EFM32JG,CF1XX,CF38X,EFM32GG8X,SL28PCIE50,SI5339X,TSM98XX,SL188X,SI2166-BXX,CTXXX,SI828X,SL2874,SI804X,SI5380X,SI7060X,TS1005,C8051F4XX,TS1004,TS1003,SI47XX-B3X,C8051F35X,TS1002,TS1001,CP2107,CP2105,CP2104,EZR32X,CP2109,CP2108,SIM3XXXX,SL2861,SI805X,SL2864,IAP4XX,SI2401,SI47XX-B2X,SI2400,SI2403,EFM32HG,CP2103,CP2102,SI47XX-C4X,CP2101,SI5381X,C8051F36X,CF2XX,CF39X,SI4709,CF36X,TS7XXX,SI4708,SL28PCIE30,S3UX,CP254X,SI2166-AXX,TSM97XX,SL3816,SL2850,SI806X,SI470X-C19,SI4830,SL2854,SI4834,SI2535,C8051F37X,SI4836,CF37X,SI482X,CP26XX,EFM32GG9X,EFM32TG2X,C8051TXXX,C8051F38X,EFR32MG13P8X,CF34X,SI5328,SI5327,SI5326,SI5325,SI5324,SI5323,SI53102,SI5322,SI824X,SI5211X,SI5332X,SI5320X,C8051F31X,EFM32G2X,SL28SR,SL3800,SI703X,ZM5X,SL151,SI2417-E,CF4XX,SL153,SI2417-D,CF35X,EFM32TG108X,SL28EB636,SI483X-B,SL158,SI2493-D,SI53108,SI2493-C,SI2164-X,C8051F32X,SI83XX,SI825X,SI53106,SL28EB742,SI2404-D,EFR32MG13P6X,CF32X,SL28EB745,SI2404-C,IA14XX,TSM99XX,SL28EB740,C8051F33X,SI5321-H,SI3050-D,SI3050-E,SI5330X,SI826X,RM2,530X,C8051F5XX,SI3228X,SL28EB731,CF5XX,EFR32MG13P7X,CF33X,SL28EB735,SL23EP,SI2163-X,C8051F34X,SI5331X,SI827X,SI803X,TS9XXX,SI3229X,SI2167-DXX,CF30X,CPTXXXX,SI5376X,C8051F8XX,SI7008,SI7007,SI7006,SI7005,SL28770,SL28EB797,SL28773,SL28774,SL28775,SL28776,CF31X,SL28779,SI3226-X,CP4000,SI241X-B,SI241X-C,SI2167-CXX,SI241X-A,IA12XX,SI241X-H,SI241X-F,SL28EB781,SI241X-G,C8051F7XX,SI822X,SI50122,SI5374X,EFR32Z,SI701X,EFR32MG1P7X,EFM32GG2X,EFR32R,SI2457-FT,SL28EB774,CF7XX,WFM200,SI823X,SI2165-X,SI5375X,5XX,C8051F30X,SI702X,SI84XX,CP22XX,EFM32GG1X,TSM12XX,ZW0X,SI307X,BGX13S22GX,CF8XX,SI479XX,EFM32TG11BX,SI87XX,SI41XX,SI308X,SI8SX,SI502X,EFR32MG1P6X,SI405X,SI2160-X,SI8273-D-IDI,TSAXXXX,IA10XX,EFM32ZG,C8051F9XX,SI854X,SI406X,SL38160CZC-30B,SL15300EZC-70,SI2435-E,SI72X,SI2435-F,SI2435-C,CF9XX,SI2435-D,EFM32G8X,SI86XX,SI504X,SL15300EZC-75,SI2435-B,SI500,SI3226X-C,EFR32MG1B6X,SL28EB721,SL15100CZC-1,SL28EB720,SL28EB725,IA32XX,SI2191,SI2190,EFR32MG1P1X,SI53019,SI2196,S3CX,SI5336X,SI436X,EFR32BG1X,SL28EB719,SL28EB717,SI5301C,EFR32MG1B7X,IAP90X,SI2415-D,SI53212X,SI5338X,RWM3,SI216XX-X,SI3052,SI2162-X,EFR32MG1P2X,SI3054,SI5216X,SI3056,SI510X,SI534X,SI401X,EFR32FGX,ZGM,SI5364,SI5365,SL28PCIE2,SI5368,SI535X,SI5369,SI31XX,SI5366,SI5213X,SI5334X,SI5367,SI402X,SI511X,EFR32MG2X,SI850X,EFM32WG,SI5311X,SI5013,EFM32G3X,SI88XX,SI5010,EFR32BG2X,SI306X,SD35X,SL28DB,SI403X,SI5214X,SI5335X,SI2161-X,SI512X,SI851X,TSM92XX,SL281XX,SL28PCIE10,SI3219X,CP240X,IAP93X,SI705X-A20,SI2151,SI2150,SI3000,SI2153,SI2155,SI2157,BGM13S3X,SI117X,SI2156,SL28PCIE19,SI5306,SI3006,SI2159,SI892X,SI432X,SI3005,SI2158,SI3008,SI3007,EM26X,SL28PCIE16,SI3009,SL28PCIE14,SI5386X,EFR32MG1B1X,SI3218X,MGM1X,SI3011,CY2815,SI3010,SI3012,SI348X,SI3015,SI118X,SI3014,SI106X,SI5317,SI324X,SI433X,SI3017,SI3016,SI3019,SI5316,SI445X,SI3018,EFR32MG1B2X,EM25X,BGM13S22FX,SI5319,IAP91X,TSM91XX,CP250X,EFM32TG8X,SI2171,SI2170,SI2173,SI2172,SI2177,SI2176,SI2178,SI446X,SI5315X-A,SI5388X,SI5315X-C,TS3300,SI2180,SI705X-A10,SI2182,SI5409X,SI2181,SI2183,SI2185,SI108X,SI302X,SL28PCIE06,SI435X,EM35X,SI3239X,SI2111,SI2113,SI2115,C8051F0XX,SI476X,SI210X,SI101X,SI5221X,EM34X,TS4XXX,TS331X,SI2434-D,SI2457-D,SI2457-C,IAP86X,EFR32MG12PX,SI3450,SI4780,SI3453,SI3211,EFM32PG,SI3452,SI3210,SI3455,SI2124,SI3454,SI3457,SI477X,SI3215,SI3456,SI2434-C,SI5389X,SI3459,SI114X,SI2128,SI3458,SI3216,SI2127,SI102X,SI320X,SI5220X,SI4732-AXX,SL15300DZC-56,SI3217X,TSM93XX,BM1X,SI4430,SI2494,SI3220,SI4312,SI4313,SI4310,SI4431,SI4311,SI4432,SI2137,SI35XX,SI4438,SI3225,SI115X,SI2136,SI103X,SI890X,SI3227,SI2138,SI442X,TS11XX,EM31X,SI47XX-D,SI8271-D-IDI,SI2140,SI3230,SI2141,SI3233,SI2144,SI3232,SI2143,SI2146,SI2145,SI346X,SI2148,SI2147,SI46XX,SI3238,SI8271-D-YDI