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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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Pulse Rate monitoring in PC (wireless)

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This circuit is used to display the number of pulses occurred per minute on the PC desktop.we can use this to calculate frequency of the signal. 
Working: i will calculate the signal peaks every minute and i will send that information using wireless protocol(Gigbee/GSM). on the other end i will receive by the same wireless device and i will send the same data to RS232 port of a PC. You can monitor the data on Hyper-terminal.
     
                                                                                                             
You have to connect wireless device GSM/Gigbee on both sides. depending the device connected you have modify your code.                                                             
NOTE: i haven't indicated any wireless device. that will be connected to DB9 port.
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