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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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5V Boost Converter using LTC3440

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A simple 5V boost converter using LTC3440 shown here. LTC3440 is a high efficiency DC to DC converter that can be operated from input voltages below, above or equal to the output voltage. As for the synchronous rectification, LTC3440 delivers up to 96% efficiency and up to 600 mA output current is guaranteed. The IC has built an oscillator whose frequency synchronized whose frequency can be adjusted from 300 kHz to 2 MHz


The LTC3440 circuit is connected as a boost converter capable of delivering 5V output 5V @ 300mA constant input voltage of 2.7 to 4.2 V. The resistor R4 is used to set the oscillator frequency, while the resistors R1 and R2 are used to adjust the output to 5 volts. Resistance R3 and capacitor C1 form a frequency compensation network, while C3 serves as an input bypass capacitor. S1 is the stop switch and capacitor C2 is the output filter.

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