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高压发射器改善超声图像 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2008年11月CMDM电子快讯 » 技术新知
高压发射器改善超声图像

为了帮助制造商开发价格经济、外型小巧的超声系统, Texas Instruments 公司 (TI; www.ti.com) 推出一系列全集成式高压脉冲发生器和开关。作为 TX7xx 系列的第一款产品, TX734 是一种四通道的高压脉冲发生器(也被称为发射器),适用于从便携式设备到中程医疗超声系统的各种产品。与分体式设计相比,该机型面板面积减小 50% ,其主动阻尼功能可改善脉冲对称性和二次失真,获得更为清晰的图像。

TX734 型产品的 64 针、 9 9 mm QFN 包装内集成了四通道的电平转换器、驱动器、高压输出级和主动阻尼功能,可满足高密度系统对三级高压脉冲模式的要求。

主动阻尼,也称快速钳位接地,能够产生干净的三级归零( RTZ )波形。 这样可改善脉冲对称性,将二次失真减小到 -40 dB 水平。 TX734 的主动阻尼功能可防止噪音传入传感器中,使信号灵敏度至少提高 5 dBc ,从而获得更好的图像品质。

TX734 的输出级可提供最高达 2 A 的峰值输出电流以及高达 75 V 的电压摆动,适用于从便携式设备到中程系统的各种产品。 TX734 的输出频率高达 15 MHz ,使客户能够充分利用高频传感器获得远场图像。


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