Analog Electronics — question 10 of 10
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You've built a precision analog front end: a voltage reference sets an ADC's full-scale range, and a precision op-amp buffers and amplifies a sensor signal ahead of it. At room temperature everything reads correctly, but running the board through a thermal chamber from -20C to +85C, the measured output drifts by several millivolts referred to input, and the drift isn't monotonic with temperature. Walk through how you'd isolate whether the dominant error source is the reference's temperature coefficient, the op-amp's offset voltage drift, or its bias current drift.