Abstract: Technology for near infrared (NIR) based communication and/or sensing of implantable medical devices and systems as well as method of operating the same.

Abstract: Technology for near infrared (NIR) based communication and/or sensing of implantable medical devices and systems as well as method of operating the same.

Abstract: An automatic output offset control circuit for a DC-coupled RF amplified optical-to-electrical converter has a photodiode for converting an optical signal to an electrical signal. The current from one side of the photodiode is coupled into the input of a bipolar RF amplifier that generates a voltage output. The current from the other side of the photodiode is sensed for generating a voltage that is compared with the output of the RF amplifier. Any mismatch between the sensed current and the RF amplifier generates an error signal that is used to control the DC bias supplies of the RF amplifier. The DC bias supplies are adjusted in unison to produce the correct offset at the amplifier output for the given photodiode current while maintaining a constant AC-gain. The circuit automatically corrects for the DC-coupled output offset drift and variations of the RF bipolar amplifier. The circuit may be implemented using either voltage or current signals to the feedback circuit.

Abstract: A measuring system includes a first circuit that produces a first signal. A transmission line has a first end and a second end where the first end is interconnected with the first circuit so as to receive the first signal. A second circuit is remotely located from the first end of the transmission line and interconnected with the second end of the transmission line so as to detect the first signal. The second circuit in response to detecting the first signal produces a second signal that is received by the second end of the transmission line. The first circuit detects the second signal and in response determines the length of the transmission line. The first signal and the second signal preferably have different frequencies and the transmission line is preferably a fiber optic cable.