Switch techniques for load sensing

摘要

Techniques for sensing the resistance of a load. In an aspect, a sense resistor is provided in series with the load. Each terminal of the sense resistor is alternately coupled via switches to a sense amplifier. A second input of the sense resistor is coupled to a terminal of the load. The voltage drop across the load and the voltage drop across the load plus sense resistor are alternatively measured. These voltage drops may be digitized and used to compute a resistance of the load using, e.g., a digital processor.

主权项

1. An apparatus comprising:
a sense resistor having a first terminal and a second terminal; a first switch coupled to the first terminal; a second switch coupled to the second terminal; wherein the first and second switches are configured to alternately couple one of the first and second terminals to a sense amplifier.