CPC G01R 19/10 (2013.01) [B60R 21/0173 (2013.01); H03M 1/124 (2013.01); H03M 3/464 (2013.01); H03M 3/494 (2013.01)] | 23 Claims |
1. A method for measuring a voltage drop at a node, the method comprising:
having a circuit comprising an analog-to-digital converter, a current sink, and a controller, an input of the analog-to-digital converter and an input of the current sink coupled to the node;
sampling a first output of the analog-to-digital converter during a first steady-state condition, the current sink disabled during the first steady-state condition;
selectively adjusting an amount of current sunk through the current sink until the output of the analog-to-digital converter is at a targeted value relative to the first output;
sampling an output of the analog-to-digital converter during the voltage drop; and
computing a relative voltage drop value comprising subtracting the sampled output of the analog-to-digital converter during the voltage drop from a sampled output of the analog-to-digital converter during a second steady-state condition, the current sink operating at the targeted value during the second steady-state condition and during the voltage drop.
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