What is the importance of having an instrumentation amplifier at the first stage?
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It is important to have an instrumental amplifier because, during the first stage of an instrumentation amplifier, it has various internal output voltages which keep clipping at an unspecified level.
These instrumental amplifiers are used to control these fluctuating outputs than their signal. Most of these instrumental amplifiers contain several resistors and op-amps.
They are also designed to offer low noise and high stability.
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