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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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Simple Instrumentation Amplifier Circuit Diagram

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Simple Instrumentation Amplifier Circuit Diagram, An instrumentation (or instrumentational) amplifier is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment. LTC1043 and LT1013 dual op amps are used to create a dual instrumentation amplifier using just two packages. 


Instrumentation Amplifier Circuit Diagram


A single DPDT section converts the differential input to a ground-referred single-ended signal at the LT1013`s input. With the input switches closed, C1 acquires the input signal. When the input switches open, C2`s switches close and C2 receives charge. Continuous clocking forces C2`s voltage to equal the difference between the circuit`s inputs. The 0.01-I`F capacitor at pin 16 sets the switching frequency at 500Hz. Common-mode voltages are rejected by over 120 dB and drift is low.

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