Entire GPS systems, including batteries and wireless transmitters for downloading data, are now no bigger than a coin.

整个GPS系统，包括电池和供下载数据的无线发射机，比硬币还小。

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Various PA linearization techniques have been adopted to improve linearity and power efficiency of wireless transmitters.

于是多种不同功率放大器的线性化技术被采用来改善无线发射机的线性度及效率。

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This is different than using wireless transmitters to relay measurements from conventional breathing monitors.

ENGADGET: Researchers use wireless network to monitor breathing, could save lives

If left unprotected, these same wireless transmitters can be tapped by hackers to collect personal data, or even reprogram the implant.

FORBES: New Jamming Tech Could Protect Pacemakers from Hack Attacks

The technology, based around an "organic semiconductor" called pentacene (a hydrocarbon molecule) and a comparative instrument known as a Wheatstone bridge, can be embedded in fabrics such as undershirts and coupled with wireless transmitters.

ENGADGET: "Organic semiconductors" help researchers monitor your heart