Patent ID: 8179151
Filing Date: 2012-05-15
Classification: G01R

Abstract:
1. A system for identifying a resistor from a set of resistors, the system comprising: a first current source carrying a current of a least significant value; a set of parallel current sources, each mirrored from the first current source; a set of addressable switches, each switch defining an input and an output, with one switch input connected to each current source in the set of parallel current sources; and with the switch outputs connected together and to the resistor being identified; addressed drivers that activate the addressable switches; wherein when activated current runs through the resistor being identified creating a first voltage; a reference voltage; a comparator with one input being the first voltage and the other being the reference voltage, wherein the comparator output determines which input is higher than the other, and wherein the addressed drivers are changed so that a different current runs through the resistor.