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芯片提升超声图像质量并降低功耗 - China Medical Device Manufacturer
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Wed, January 17th, 2018

2008 秋季刊 » 技术新知
芯片提升超声图像质量并降低功耗

德州仪器公司(TI;美国德州;www.ti.com)为便携式高端超声诊断设备设计了一系列全集成模拟前端(AFE)产品,以满足医疗行业对于减小电子设备体积、增强产品便携性能的需要。AFE58xx芯片与现有芯片相比,能提升图像质量并降低功耗。

医疗产品业务部项目直属经理KarthikVasanth说:“该产品旨在满足行业需求。整个行业似乎都在询问:‘能否在保持性能不减的同时降低半导体芯片的大小?’这款芯片就是我们的回答。”Vasanth还说功率要求是影响便携式系统的关键问题,因为这些设备通常需要长效电池。在不增大部件大小的前提下,增加通道数量则是稍大一些的超声系统需考虑的因素。而AFE芯片旨在满足上述两种需求。

该系列的第一代芯片AFE5805与早期半导体产品相比,元器件的数量更少。德州仪器公司通过减少元器件的数量,使芯片功耗最高降低20%,每个通道的功耗为122mW。该芯片还具有噪音低的特点——该公司表示,与市场同类芯片相比,噪音降低了40%——2 MHz下仅为0.85nV/rtHz。这一性能水平不仅适用于便携式设备,同样可以满足中等和高通道密度超声系统的要求。

德州仪器公司称,AFE5805芯片仅为159mm,为同类产品的一半,是市场上体积最小的AFE产品。该芯片集成了8通道低噪音放大器(LNA)、压控衰减器、可编程增益放大器和低通滤波器,以及带有低压差分信号数据输出的12位50-MSPS模数转换器。

芯片内置LNA的低压输入噪音水平是影响整个输入信号通道的关键因素,决定着整个系统的性能,包括其高分辨率。AFE芯片的低噪音和低功耗设计让OEM制造商能在相同空间内集成更多的通道,例如,因此可以增加MRI设备检测的病人数量。

Vasanth解释说:“若原本1个小时可检查3位病人,而现在通道功率足够让你检测6位病人。相同类型的设计效益推动着其它设备的微缩化和低功耗的发展。”

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