|Dimensions||3600μm x 4350μm|
|Power||0.520 mW, 3V|
Continuous and accurate long-term monitoring of internal biomedical signals plays an important role in modern medicine. This requires sophisticated implantable devices. They must be small in size to ease implantation and provide wireless transmission to reduce the infection risk. Therefore, a low-power, single- chip, fully implantable microtransponder system has been designed.
The circuit is powered by an external RF source at 27 MHz or 40 MHz. No battery is required. Wireless communication with external monitoring units is realized by absorption modulation. As the radiated power received by a small coil can be as low as a few milliwatts the data acquisition/transmission system has been optimized for low power consumption. The system has been integrated in a 2um 40 V BiCMOS technology. It includes a low-offset amplifier, lowpass notch filter, A/D-converter, voltage doubler, and rectifier, as well as a low-power voltage regulator.