CPC G01R 19/257 (2013.01) [H03K 5/24 (2013.01)] | 20 Claims |
1. A load-sensing circuit comprising:
a load coupled to a load source having a load voltage that causes a load signal to flow through the load;
a regulated sink circuit coupled to a sink source providing a sink voltage, wherein the regulated sink circuit is coupled in series with the load, and is configured to regulate, based on a regulation signal, a first electrical characteristic of the load signal;
a comparison circuit including:
a reference input configured to receive a reference signal that establishes a reference value of a second electrical characteristic, wherein the reference signal includes one or more oscillating components;
a sense input coupled to the load and to the regulated sink circuit, wherein the regulated sink circuit regulates the first electrical characteristic of the load signal so that a sense value of the second electrical characteristic present at the sense input matches the reference value of the second electrical characteristic;
a comparison output configured to generate a comparison signal indicating a difference between the sense value of the second electrical characteristic and the reference value of the second electrical characteristic;
a feedback circuit coupled to the comparison output and to the regulated sink circuit, the feedback circuit configured to generate the regulation signal based on the comparison signal; and
an analog to digital converter configured to convert the comparison signal into a digital signal.
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