【经验】如何提高思瑞浦单位增益差分放大器TPA9151的共模抑制比?
某客户设计一款称重计量电路,需要一颗高精度的运算放大器来做信号放大,为了得到较高的测量精度,尽可能减少典型误差源(例如失调和增益误差,以及噪声、容差和漂移)。为此,需要使用高精度运算放大器。客户选用的思瑞浦的TPA9151单位增益差分放大器,本文帮助客户通过外围电路设计来提高共模抑制比。
传统的差分电路应用如下:
如果我们需要通过外围电路来调整CMRR,放大器电路的外部元件选择就显得重要,尤其是电阻,它们应该具有匹配的比值,而不能任意选择。
理论情况下,我们要求其比值应相同 (R2/R1 = R4/R3)。这些比值有任何偏差都将导致不良的共模误差。然而在实际情况下实际使用中传统电阻的阻值并不恒定。它们会受机械负载和温度的影响。
因此我们建议:
根据需求的不同,可以使用具有不同容差的电阻或匹配电阻对(或网络),其大部分使用薄膜技术制造并具有精确的比值稳定性。利用这些匹配的电阻网络,可以大幅提高放大器电路的整体 CMRR。如下图所示
所以我们在设计差分放大电路时必须根据差分放大器电路的精度要求仔细选择外部电阻电路,以便实现系统的高性能。
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思瑞浦(3PEAK)车规芯片选型指南(英文)
描述- Established in 2012, 3PEAK was listed on the Shanghai Science and Technolog y Innovation Board on September 21, 2020. The company is committed to the research and de velopment of high-performance, high-quality, and highly reliable integrated circuit products, including signal chains, power analog chips, mixed-signal front-ends, and embedded processors to provide customers with all-around solutions
型号- LM2904A-VS1R-S,TPL8032ADQ,TP1562AL1-SO1R-S,TPM27524Q-SO1R-S,TPA2031Q,TPT1042V-SO1R-S,TPL803133Q-DF6R-S,TPT7742-SOBR-S,TPH2861-DF4R-S,TPR6040F30-S3TR-S,TPM2025Q-FC1R-S,TPT1042Q-SO1R-S,TPA1881Q-S5TR-S,TPR6040F33-S3TR-S,LM2902A-TS2R-S,TPR33XX,TPA8001-SOAR-S,TPA8003-SOAR-S,TP1564AL1-SO2R-S,TPL905236-S5TR-S,TP2262L1-SO1R-S,TPT1043Q-SO2R-S,TPT1051VQ-DF6R-S,TPR6040FXX,TPT1051Q-SO1R-S,TPT774X,TPL803133Q-EV1R-S,LM2903DQ-SO1R-S,TPT1051Q-DF6R-S,TPL8652FQ-ES1R-S,LM2903A-SO1R-S,TPT1051VQ-SO1R-S,TPR3330-S3TR-S,TPT7741F-SO3R-S,TPL803133Q-ST4R-S,TPT7741F-SOBR-S,TPL803450Q,TPL803450Q-EV1R-S,TPR3312-S3TR-S,TPL803150Q-ST4R-S,TPL905218-S5TR-S,TPL905233-S5TR-S,TPT7720-SO1R-S,TPR6040F25-S3TR-S,TPT1043Q-DFKR-S,TPL905215-S5TR-S,TPR6040F20-S3TR-S,TPL8651Q-ES1R-S,LM2901A-SO2R-S,TPT1145NQ-SO2R-S,TPL9052XX,TPL8031XXQ,TPA2644-SO2R-S,LM2904A-TS1R-S,TPM650XAQ,TPL8151ADQ-ES1R-S,TPL865XQ,TPT772X,TPT1042Q-DF6R-S,TPT7721-SOBR-S,TPT1044V-SO1R-S,TPT1145Q-SO2R-S,TPR3325-S3TR-S,TPR431B-S3TR-S,TPR6040F50-S3TR-S,TPW3188Q,TPT7742F-SOBR-S,TPA1882Q-VR-S,TPR3320-S3TR-S,TPL910ADJQ,TPT7740F-SO3R-S,TPC5120Q-TS7R-S,TPL803150Q-DF6R-S,TPL910ADJQ-DF6R-S,TPV8368SAQ,TPA1882Q-SO1R-S,TP1561AL1-S5TR-S,TPA5561Q-S5TR-S,TPL905225-S5TR-S,TPL905228-S5TR-S,TPT7741-SSAR-S,TPL8151ADQ,LM2902A-SO2R-S,TP2261L1-S5TR-S,TPA2031Q-S5TR-S,TPM2025Q,TPL803150Q-EV1R-S,TPM27524Q-DF4R-S,LM2903A-TS1R-S,TPV8368SAQ-S6TR-S,TPT1145NQ,TP1562AL1-VS1R-S,TPL803133-ST4R-S,TPT104XQ,TPR3333-S3TR-S,TPT1042VQ-SO1R-S,TPL905230-S5TR-S,LM2903A-VS1R-S,TPM27524Q-EV1R-S,TPR6040F40-S3TR-S,TPM27524Q,TPT7721-SO1R-S,LM2901A-TS2R-S,TPM6501AQ-S5TR-S,TPL905212-S5TR-S,TPT7720F-SO1R-S,TPA188XQ,TPT1145NQ-DFKR-S,TPR431B,TPM6505AQ-S6TR-S,TPT7741-SOBR-S,TPA5561Q,TPT1051VQ,TPT1042VQ-DF6R-S,TPL8032ADQ-ES1R-S,LM2904A-SO1R-S,TPW3188Q-TS3R-S,TPC5120Q,LM2903DQ,TPR3340-S3TR-S
TPA9361精密差动放大器
描述- TPA9361是一款高精度差分放大器,适用于精密信号调理。它具有低失调电压、高共模抑制比和高带宽等特点,适用于工业控制、音频和其他需要宽共模电压范围的单电源应用。
型号- TPA9361,TPA9361-SO1R
【IC】思瑞浦新推多通道高精度ADC TPC517系列,最高1MSPS采样率,输入端口配置灵活
聚焦高性能模拟芯片和嵌入式处理器研发的半导体公司——思瑞浦3PEAK全新推出多通道高精度ADC——TPC517系列,芯片内置高精度基准,工作温度支持-40℃~+125℃,产品广泛应用于测试测量、工业仪器、数据采集和医疗设备等领域。
TPA5511/TPA5512 3.3 V、9 kHz、零漂移、毫微功耗运算放大器
描述- 该资料介绍了TPA551x系列纳米级低功耗、零漂移运算放大器。这些器件具有极低的偏置电流(典型值为650 nA)、高精度输入失调电压(±30 μV最大值)和稳定的频率响应(9 kHz带宽),适用于需要低待机功率的高精度传感应用。
型号- TPA5511U-SC5R,TPA5512-DFSR,TPA5511-S5TR,TPA5512-SO1R,TPA5512-TS1R,TPA5512-VS1R,TPA5511U,TPA5511-SC5R,TPA5511-DFPR,TPA551X,TPA5511U-S5TR,TPA5512-DFGR,TPA5512,TPA5511,TPA551X FAMILY
TP2311/TP2312/TP2314 10MHz带宽、低噪声精密运算放大器
描述- 该资料介绍了3PEAK公司的TP2311/TP2312/TP2314系列低噪声精密运算放大器。这些产品具有高精度、低噪声、宽带宽、低输入偏置电流和低温度漂移等特点,适用于需要高直流准确度和交流性能的应用。
型号- TP2311 SERIES,TP2312-VR,TP2314-SR,TP2311-TR,TP2314,TP2312-SR,TP2311-SR,TP2312-TR,TP2314-TR,TP2311,TP2312
【应用】思瑞浦高共模差动放大器TPA9151助力无刷直流电机实现精确电流检测,增益误差最大为0.03%
常见的电机电流检测可采用霍尔电流传感器、电流互感器和采样电阻加运放的方法,而考虑到采用霍尔检测的方案会导致电磁干扰,所以此处使用采样电阻配合运放的方式进行,运算放大器采用的是思瑞浦TPA9151-SO1R进行无刷直流电机的三相检测。
超低功耗、高精度、小体积!思瑞浦CGM动态血糖仪应用方案,实现测量精确性和质量可靠性并存
由于糖尿病患者数量的逐年增加,佩戴舒适且可以持续监控血糖水平的CGM也越来越受到欢迎,其独特的医疗属性,要求测量精确性和质量可靠性缺一不可。思瑞浦在信号链和电源领域深耕多年,产品性能领先,质量管控严格,拥有完善的交付体系,与国内医疗健康领域重要客户均有合作,是您值得信赖的合作伙伴!
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可定制玻璃钢天线的工作频段:100MHz-40GHz;工作温度:-40℃~85℃;增益:2dBi-50dBi;尺寸范围:100mm~30000mm。
最小起订量: 100pcs 提交需求>
可定制胶棒天线频率范围包括GSM/GRPS/2G/3G/5G/2.4G/5G/5.8GHZ/WIFI/蓝牙、LoRa、433/470/315/868/915Mhz/NB等;增益:0~15dBi;天线尺寸、接口连接器可按需定制。
最小起订量: 1000 提交需求>
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