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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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RE46C190 Photoelectric Smoke Detector

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This photoelectric smoke detector can be Created a very simple and low power smoke detector alarm that is based on the RE46C190 smoke detector IC. With a minimum of external components, this circuit alarm smoke detectors are provided all the necessary features for a project type photoelectric smoke detector address.

The design incorporates a selectable gain amplifier photos for use with a pair of infrared emitter detector. A flash power internal oscillator circuit smoke detector every 10 seconds, to keep the standby current to a minimum. If smoke is sensed, the detection rate is higher for verifying an alarm condition.

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