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High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

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Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of
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HEAD-MOUNTED EYE TRACKER

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HEAD-MOUNTED EYE TRACKER


The goal of the project was to design and build a low-cost, light-weight, head-mounted eye
tracker, which will enable tracking of a subjects focus of gaze within his/her field of vision. The
head-mounted unit consists of a forward-looking camera to record the subject's field of view,
and a second camera to capture the position of the eyeball. Software running on a remote host
computes the position of the subject's gaze using the video feed from these two cameras, in
real-time. The unit is significantly cheaper than existing units available in the market.
Performance and encountered with various approaches is discussed.






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