I'm trying to characterize a new IC that can act as a voltage controlled current amplifier: it supplies a constant current as a function of the voltage applied to one pin.
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I'm trying to characterize a new IC that can act as a voltage controlled current amplifier: it supplies a constant current as a function of the voltage applied to one pin. We want to know how linear its response is, if there's an offset, blahblah. And there's a periodic linearity error. I change the input voltage step size, and the periodicity changes. People stare over my shoulder. Tooth hisses. What did we do wrong in this design? (1/2)
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And I have a little lightbulb go on over my head. Wait, what if the output of the power supply I'm using to drive the pin isn't really linear? The two other engineers working with me both make O faces, and I stick a multimeter on the pin, and yeah, we're all chasing a DAC error on the supply, not an offset on our chip. Sigh. (2/2)
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