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

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

Simple Summing Amplifier Uses CA3193 Circuit Diagram

This is a Simple Summing Amplifier Circuit Diagram. This circuit uses a CA3193 BiMOS op amp. Because input noise of the amplifier is increased by Rp/ Rl//R2/ /R3, and the gain that a single input will amplify is the gain of only one of the input channels (Rp/ Rl), for good noise performance, use the smallest number of inputs. 

Simple Summing Amplifier Uses CA3193 Circuit Diagram

Simple Summing Amplifier Uses CA3193 Circuit Diagram

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