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To be able to measure signals within a wide input voltage range, a variable amplification stage is mandatory.
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This stage will, depending on the signal amplitude, amplify or attenuate the signal. This ensures that the ADC, at the end of the front-end, always samples at nearly full scale.
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Because of the characteristics of the chosen ADCs of the OpenLab front-end, the acceptable input range is defined as 0V to 3.3V.
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This is done by changing the gain-level of stage 3, depending on the amplitude of the input signal.
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