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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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AN ACCELERATION MEASURING SYSTEM VIA RADIO FREQUENCY COMMUNICATION

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This project is designed to explore the possibility of building a compact
acceleration measuring device and applying it in a typical middle/high school science
class. Such an interesting interactive device could to be used to improve the traditional
classroom environment. Students can carry the device on their bodies and see how fast
they move, and ideally, it is hoped to help them become more interested in learning
simple physics. The project’s design is based on a pair of microcontrollers.
Accelerometer’s sensors are used and data are transmitted through radio frequency and
serial communication (RS232). Readings of the accelerometer’s outputs are updated ten
times a second and data will be shown in graphical interpretation after measurement is
taken. The designed goal of this project is to provide a simple-to-use and reliable device
that can record the acceleration with good time resolution.