Design considerations for portable medical electronic devices

- Apr 21, 2017-

With the onset of diabetes and heart disease and other serious diseases surge, accompanied by the accurate portable patient monitoring system, which including cholesterol, blood, blood pressure monitoring, and other portable medical devices. And, more importantly, the user of the device is able to follow up on the results of individual tests. The technical progress of the mobile phone industry, the establishment of a fairly uniform standard and external dimensions, so that the product to the consumer's availability and ease of use greatly improved.

According to the evolution of mobile phones, there are a number of obvious trends that all portable devices should consider. The following topics are discussed: the I/O standard, the advantages of USB ports, the durability of ESD protection, and the use of analog switches to improve the functionality of FPGA and ASIC in medical devices.

With the growing popularity of ASIC and FPGA, using them as the core of the device seems to be a natural decision. The initial cost advantage of this decision can be easily calculated, but it is important to consider the various devices required to be integrated into an integrated device. The core operating voltage of the portable design is usually 2.5V or lower, which is very useful when working out of the battery. It can be used to maintain the efficiency with a minimum voltage difference. However, to achieve this low core voltage and rich gate number in ASIC technology is not without shortcomings, instead of these devices are easily influenced by the high voltage peak, the peak is called electrostatic discharge (ESD).

An important feature of all portable devices is the ability to add storage. Memory card standards, several of the most common standards are SD, MicroSD and XD. In order to avoid the design is limited to the use of a memory card, the analog switch can be used to add more than two memory card slot. Because you can access only one memory card at a time, you do not need to use a dynamic hub switch. SD card development to be able to integrate the application into the actual memory card. Applications include Bluetooth, Wi-Fi, fingerprint scanners and GPS, which continues to evolve. In the portable design to increase the SD card function, will be able to benefit from the development of these cards.

As mentioned earlier, if you need to mix a variety of video signal source, you can also use analog switches. For portable medical devices, this is not a common requirement, but in all other types of portable devices, video output connectors have become increasingly common. Mobile phones have begun to add such features, mainly used to browse photos taken with the camera. So why set the video output port on the medical device?

Because the composite video output allows the user to fully review all records, or for full size playback video. Graphics processing is often an option offered by ASIC vendors, but it also requires a drive cable for a video driver. Fairchild's latest FMS6501 is an ultra small integrated video filter and line driver, while providing ESD protection.

Medical consumer goods are easy to use, durable and accurate. The portable technology potential has emerged, and in today's mobile phone industry has been verified, that portable device only needs to maintain as little as possible. The medical community must follow a similar path of development, for example, integrated hematology analyzers, thermometers, and blood pressure devices. When the medical device through the USB port and PC analysis capabilities, the patient can be accurate testing and tracking. Understanding these small signal areas in the forefront of IC, will be able to develop a better terminal medical products.

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