【经验】四路模拟开关SGM330A的1B1波形存在干扰杂波的原因和解决办法

时间： 2021-03-25 来源：世强

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某客户的产品设计中使用了圣邦微电子的四路模拟开关 SGM330A，电路设计原理图如图1所示，1B1脚和1B2设计为输入，1A设计为输出。电路设计中将SGM330A的1脚IN和2脚1B1连在一起，想用1B1的输入同时控制IN脚。

图1：SGM330A电路设计原理图

用示波器监其控波形，如图2所示。黄色是1B2的波形，蓝色是1B1的波形，由CPU控制。由波形可以发现当1B1输入低电平时，1B1波形有2V左右的干扰杂波。

图2：1B1和1B2波形

图3：SGM330A的方框图及真值表

如图3所示SGM330A的方框图及真值表，当IN高电平，1B2的开关管导通，1A=1B2；当IN从高电平切换到低电平，1B1的开关管导通，1B2的开关管断开，在这个电路中，IN和1B1连到一起，由于时序问题（1B1开关管快速导通），1B1受到电平1A和IN共同影响从而导致有干扰脉冲产生。

若是产品设计没有定型，可以更改电路或PCB，建议在电路设计中将IN和1B1独立控制，避免相互干扰；若是产品已经定型，无法更改电路，可以换同品牌的模拟开关SGM5018YTS/TR，此物料可以PIN-TO-PIN替代SGM330A-YTS/TR，而且SGM5018YTS/TR具有Break-Before-Make功能，延时时间打到20ns，也可以避免1B1被干扰。

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2024/6/11 - 选型指南代理服务技术支持采购服务

【产品】四路SPST CMOS模拟开关SGM4511、GM4512 ，导通电阻低至23Ω

SGM4511和SGM4512是低成本CMOS单片四路单刀单掷模拟开关，改进的电荷注入补偿设计用于最小化开关瞬态响应。SGM4511是一款常闭开关IC，SGM4512是一款常开开关IC。可以被用于通用场合的模拟开关应用中，通讯行业、仪器仪表、过程控制、计算机外围设备等。

2019-02-27 - 新产品代理服务技术支持采购服务

SGMICRO模拟信号开关选型表

高至4通道，SPDT，DPDT，低静态电流，低内阻，高带宽

TQFN-3×3-16L TSSOP-16

选型表 - SGMICRO 立即选型

SGMicro（圣邦微）SGM4511/SGM4512 四路SPST CMOS模拟开关数据手册

SGM4511/2 四路SPST CMOS模拟开关（Quad SPST CMOS Analog Switches）

SGMICRO - QUAD SPST CMOS ANALOG SWITCHES,CMOS模拟开关,四路SPST CMOS模拟开关,四SPST CMOS模拟开关,模拟开关,SGM4511YS16G/TR,SGM4511YTS16G/TR,SGM4511,SGM4512,SGM4512YS16G/TR,SGM4512YTS16G/TR,PORTABLE INSTRUMENTS,磁盘驱动器,SAMPLE-AND-HOLD CIRCUITS,采样保持电路,试验设备,COMMUNICATIONS SYSTEMS,INDUSTRIAL INSTRUMENTATION,TEST EQUIPMENT,工业仪表,DISK DRIVES,便携式仪器,电脑外设,通信系统,COMPUTER PERIPHERALS

数据手册 - REV. A 代理服务技术支持采购服务

【产品】关断漏电流仅1nA的四路单刀单掷CMOS模拟开关

SGM48754隔离度高达-80dB，降低电池供电设备等的信号干扰。

2017-04-27 - 新产品代理服务技术支持采购服务

我们视讯会议产品上需要一颗四路模拟开关，请问有合适的物料推荐吗？

根据您的需求，推荐SGM的SGM4511YS16G/TR。它可在±4.5 V至±20 V的电源下连续工作，并具有30 mA的改进连续电流额定值，能在通电状态下提供真正的双向性能，并在断电状态下阻断信号至电源电平。SOIC-16封装，规定温度范围为-40℃至+85℃。可以满足您的需求。详细资料请参考数据手册：https://www.sekorm.com/doc/651357.html

2023-06-07 - 技术问答代理服务技术支持采购服务

SGM330A四通道、宽带宽单刀双掷视频模拟开关

SGM330A是一款四通道双向单刀双掷（SPDT）视频模拟开关，适用于2.7V至5.5V的单电源供电。该器件具有低串扰、低导通电阻和快速切换时间等特点，带宽高达500MHz，适合高频应用，如视频编辑器、音频和视频信号路由等。

SGMICRO - 四通道、双向、单刀双掷（SPDT）、TTL/CMOS兼容视频模拟开关,QUAD, WIDE-BANDWIDTH SPDT VIDEO ANALOG SWITCH,四路宽带宽单刀双掷视频模拟开关,QUAD, BIDIRECTIONAL, SINGLE-POLE/DOUBLE-THROW (SPDT), TTL/CMOS COMPATIBLE VIDEO ANALOG SWITCH,SGM330A-YS/TR,SGM330A-YQS/TR,SGM330A-YTS/TR,SGM330A,DIGITAL VCRS,个人数字助理,BATTERY-POWERED SYSTEMS,TV GAME PLAYERS,可重复刻录的DVD,VIDEO SIGNAL ROUTING,PERSONAL DIGITAL ASSISTANTS,视频编辑,音频,电视游戏玩家,VIDEO EDITORS,电脑外设,电池供电系统,VIDEO,RE-RECORDABLE DVD,COMPUTER PERIPHERALS,视频,视频信号路由,AUDIO,数字录像机

APRIL, 2023 - 数据手册 - REV. C 代理服务技术支持采购服务查看更多版本

SGM330A四通道、宽带宽单刀双掷视频模拟开关

SGM330A是一款四通道双向单刀双掷（SPDT）视频模拟开关，适用于2.7V至5.5V的单电源供电。该器件具有低串扰、低导通电阻和快速切换时间等特点，带宽高达500MHz，适合高频应用，如视频编辑器、音视频信号路由等。

SGMICRO - QUAD, WIDE-BANDWIDTH SPDT VIDEO ANALOG SWITCH,四路宽带宽单刀双掷视频模拟开关,SGM330A-YS/TR,SGM330A-YQS/TR,SGM330A-YTS/TR,SGM330A,DIGITAL VCRS,VIDEO GAME PLAYERS,个人数字助理,BATTERY-POWERED SYSTEMS,TV GAME PLAYERS,可重复刻录的DVD,VIDEO SIGNAL ROUTING,PERSONAL DIGITAL ASSISTANTS,视频编辑,音频信号路由,AUDIO SIGNAL ROUTING,电视游戏玩家,VIDEO EDITORS,电脑外设,电子游戏玩家,电池供电系统,RE-RECORDABLE DVD,COMPUTER PERIPHERALS,视频信号路由,数字录像机

JANUARY, 2017 - 数据手册 - REV.B.4 代理服务技术支持采购服务

SGM330A四通道、宽带宽单刀双掷视频模拟开关

SGM330A是一款四通道双向单刀双掷（SPDT）CMOS视频模拟开关，适用于从2.7V到5.5V的单电源供电。该器件具有宽带宽（500MHz）、低导通电阻（12Ω）和低串扰等特点，适合高频和其他应用。它提供高性能、低成本的视频源切换解决方案。

SGMICRO

2017/08/08 - 数据手册 - REV. B. 3 代理服务技术支持采购服务

【选型】瞬时开关性能优越的四路单刀单掷模拟开关SGM4512用于信号源产品，导通电阻低至23Ω

客户在信号源产品上原使用进口主流的四路常开开关，由于项目国产化找替换方案，结合使用为其推荐了SGMICRO推出的四路单刀单掷模拟开关SGM4512，瞬时开关性能好，在导通电阻为23Ω，ton为40ns，toff为120ns；具有30mA连续电流额定值。

2023-03-31 - 器件选型代理服务技术支持采购服务

电机驱动中控制信号的切换，使用了模拟开关GD403，请问有合适的替代产品推荐吗？

推荐圣邦微的模拟开关SGM4511YS16G/TR，四路SPST，数据手册链接：https://www.sekorm.com/doc/651357.html

2023-05-15 - 技术问答代理服务技术支持采购服务

SGM5018 4.5Ω、高速、低压、四通道、单刀双掷模拟开关

SGM5018是一款低电压、高速四通道单刀双掷（SPDT）模拟开关。它适用于1.8V至5.5V的单电源供电，具有高带宽、低导通电阻和低功耗等特点。该产品适用于便携式设备、音频视频信号路由等多种应用。

SGMICRO - HIGH SPEED, LOW VOLTAGE QUAD, SPDT ANALOG SWITCH,QUAD, SPDT (SINGLE-POLE/DOUBLE-THROW), TTL/CMOS COMPATIBLE ANALOG SWITCH,四通道、SPDT（单刀/双掷）、TTL/CMOS兼容模拟开关,高速、低压、四通道、单刀双掷模拟开关,SGM5018,SGM5018YTS/TR,音频和视频信号路由,SAMPLE-AND-HOLD CIRCUITS,手机,采样保持电路,个人数字助理,BATTERY-POWERED SYSTEMS,AUDIO AND VIDEO SIGNAL ROUTING,PERSONAL DIGITAL ASSISTANTS,PORTABLE EQUIPMENT,CELLULAR PHONES,电脑外设,便携式设备,电池供电系统,USB 1.1信号交换电路,USB 1.1 SIGNAL SWITCHING CIRCUITS,COMPUTER PERIPHERALS

JANUARY 2013 - 数据手册 - REV. A. 4 代理服务技术支持采购服务查看更多版本