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了解不同類型的開關球盟会全站app噪聲
2021/9/2  

一般而言,與低壓差(LDO)球盟会全站app輸出相比,人們認為傳統開關球盟会全站app的輸出電壓噪聲很大。然而,LDO電壓會引起嚴重的額外熱問題,并使得電源設計更加復雜。全面認識開關球盟会全站app噪聲很有必要,有助于設計低噪聲開關解決方案,使之產生與LDO球盟会全站app相當的低噪聲性能。本文分析和評估的目標是采用電流模式控制的降壓球盟会全站app,因為它在應用中很常用。信號分析是了解開關紋波噪聲、當前寬帶噪聲特性(及其來源)、開關引起的高頻尖峰噪聲的主要法。本文將討論開關球盟会全站appPSRR(電源抑制比,其對輸入噪聲抑制很重要)以及信號分析方法。
球盟会全站app

開關紋波噪聲怎么解決?
BENBUFENYIJUJIBOHEXIEBOLILUNJIESHAOJIANGYAZHUANHUANQISHUCHUWENBOJISUANGONGSHI。GENJUKAIGUAN球盟会全站appTUOPUJIEGOUHEJIBENCAOZUO,WENBOSHIZHONGSHIKAIGUAN球盟会全站appZHONGDEZHUYAOZAOSHENG,YINWEIFENGFENGZHIDIANYAFUDUYIBANWEIJImVDAOJISHImV。TAYINGBEISHIWEIZHOUQIXINGQIEKEYUCEDEXINHAO。RUGUOYIGUDINGKAIGUANPINLVGONGZUO,ZEZAISHIYUZHONGTONGGUOSHIBOQI,HUOZAIPINYUZHONGTONGGUOFULIXIEFENJIE,HENRONGYIJIANGQISHIBIEBINGJINXINGCELIANG。

其中:
VINWEISHURUDIANYA。DWEIZHANKONGBI;DUIYUJIANGYA球盟会全站app,QIDENGYU VOUT/VIN

VIN QUE?DINGHOU,The VSWJIBOHEXIEBO??????????????????????????CHENGFENJINQUJUEYUZHANKONGBI。TU2XIANSHILEYUZHANKONGBIXIANGGUANDE VSWJIBOHEXIEBOFUDU。DANGZHANKONGBIJIEJINYIBANSHI,WENBOFUDUYIJIBOWEIZHU。

WEILEJIANHUAJISUAN,WOMENJIASHESHUCHULCJIWEI20 dB/SHIBEIPINCHENG,RANHOUSHIYUZHANKONGBIXIANGGUANDEVOUTWENBOJIBOHEXIEBOFUDU,RUTU3SUOSHI。DANGZHANKONGBIJIEJINYIBANSHI,SANCIHUOQISHUCIXIEBOJIANGGAOYUOUSHUCIXIEBO。YOUYULCYIZHI,JIAOGAODEXIEBOJIANGJUYOUJIAODIDEFUDU,BINGQIEYUZONGWENBOFUDUXIANGBI,QIBILIFEICHANGXIAO。TONGYANG,JIBOFUDUSHIKAIGUAN球盟会全站appSHUCHUWENBOZHONGDEZHUYAOCHENGFEN。

DUIYUJIANGYA球盟会全站app,JIBOFUDUYUSHURUDIANYA、ZHANKONGBI、KAIGUANPINLVHELCJIYOUGUAN;DANSHI,SUOYOUZHEXIECANSHUDOUHUIYINGXIANGYINGYONGYAOQIU,RUXIAOLVHEJIEJUEFANGANCHICUNDENG。WEILEJINYIBUJIANGDIWENBO,JIANYIZENGJIAHOUZHILVBOQI。


寬帶噪聲怎么處理?

KAIGUAN球盟会全站appZHONGDEKUANDAIZAOSHENGSHISHUCHUDIANYASHANGDESUIJIFUDUZAOSHENG。TAKEYIYONGZHENGGEPINLVFANWEINEIDEZAOSHENGMIDULAIBIAOSHI,DANWEIWEI V/√Hz z,HUOYONGVrmsLAIBIAOSHI,QIYUPINLVFANWEINEIDEMIDUBUKEFEN。YOUYUGUIGONGYIHEJIZHUNDIANYAYUANLVBOQISHEJIDEXIANZHI,KUANDAIZAOSHENGZHUYAOWEIYUKAIGUAN球盟会全站appDE10HzZHI1MHzPINLVFANWEINEI,ZAIDIPINFANWEINEIHENNANTONGGUOZENGJIALVBOQILAIJIANGQIJIANGDI。


DIANXINGJIANGYA球盟会全站appKUANDAIZAOSHENGFENGFENGZHIFUDUDIANYAYUEWEI100μVZHI1000μV,YUANDIYUKAIGUANWENBOZAOSHENG。RUGUOSHIYONGEWAIDELVBOQILAIJIANGDIKAIGUANWENBOZAOSHENG,ZEKUANDAIZAOSHENGKENENGCHENGWEIKAIGUAN球盟会全站appSHUCHUDIANYADEZHUYAOZAOSHENG。WOMENXIANSHILEDANGMEIYOUEWAILVBOQISHI,JIANGYA球盟会全站appSHUCHUZAOSHENGDEZHUYAOLAIYUANSHIKAIGUANWENBO。TU5XIANSHILEDANGSHIYONGEWAILVBOQISHI,SHUCHUZAOSHENGDEZHUYAOLAIYUANSHIKUANDAIZAOSHENG。

DUIYUHUODEDEKONGZHIHUANLUCHUANDIHANSHUHEMOKUAIZAOSHENGTEXINGXINXI,YOULIANGZHONGBUTONGDEZAOSHENG:HUANLUSHURUZAOSHENGHEHUANNEIZAOSHENG。KONGZHIHUANLUDAIKUANNEIDEHUANLUSHURUZAOSHENGHUICHUANSHUDAOSHUCHU,ERHUANLUDAIKUANZHIWAIDEZAOSHENGHUIBEISHUAIJIAN。DUIYUKAIGUAN球盟会全站app,SHEJIDIZAOSHENGEAHEJIZHUNDIANYAYUANZHIGUANZHONGYAO,YINWEIDANWEIFANKUIZENGYIHUIBAOCHIZAOSHENGSHUIPINGBUBIAN,ERBUSHISUIZHUSHUCHUDIANYADIANPINGZENGJIAERTIGAOTA。ZUIDADETIAOZHANSHIZHAOCHUZHENGGEXITONGZHONGZUIDADEZAOSHENGYUAN,BINGZAIDIANLUSHEJIZHONGJIANGDIGAIZAOSHENG。ADP5014ZHENDUIDIZAOSHENGJISHUJINXINGLEYOUHUA,CAIYONGDIANLIUMOSHIKONGZHIFANGANHEYIGEJIANDANDELCWAIBULVBOQI,ZAI10HzZHI1MHzPINLVFANWEINEISHIXIANLEDIYU20μVrmsDEZAOSHENGXINGNENG。

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