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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 Systematic Power Booster Circuit Diagram

This is a Simple Systematic Power Booster Circuit Diagram. The Power Booster solves the power distribution problem in a CATV network caused by high resistance and low energy-efficient. This power booster functions as a high-efficiency `power multiplexer` or, if you supply an external signal-source, as a high-power linear amplifier. 

 Simple Systematic Power Booster Circuit Diagram



Simple Systematic Power Booster Circuit Diagram

If you want to drive a load with a high-power square wave, the circuit simply draws power from two external power sources, VI and V2, alternately. In this mode, the circuit`s power-handling devices function as switches, dissipating minimal power. The RC time constant of the integrator, IC1, determines the circuit`s oscillation period. If you supply an external drive waveform, the circuit functions as a linear amplifier, and, consequently, inherently dissipates varying portions of that power. 

The power amplifier is stable for gains > 15. Diodes D1 and D2 limit the FET`s gate-voltage swing to less than 15 V. D3 is a dual Schottky diode that protects the FETs from short circuits between the two supplies, VI and V2, through a FET`s parasitic diode. With D3 in place, you can choose either power channel for the higher voltage input, lb drive the FETs, Q5 and Q6, at switching frequencies greater than 1 kHz, you will have to use gate drivers for them.

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