Patent ID: 9134360
Filing Date: 2015-09-15
Classification: G01R

Abstract:
1. A circuit comprising: a first circuit module including a first resistor and first and second transistors coupled in parallel with said first resistor, wherein the first resistor and the first and second transistors are coupled together at a first node, and a gate voltage of the second transistor is based on a comparison between a reference voltage and a voltage of the first node; and a second circuit module including a second resistor and third and fourth transistors coupled in parallel with the second resistor, wherein the second resistor and the third and fourth transistors are coupled together at a second node; wherein an equivalent resistance across the first circuit module increases as a voltage of the first node is increased from a first voltage to a second voltage, and the equivalent resistance across the first circuit module decreases as the voltage of the first node is increased from the second voltage to a third voltage; wherein an equivalent resistance across the second circuit module increases as a voltage of the second node is increased from the first voltage to the second voltage, and the equivalent resistance across the second circuit module decreases as the voltage of the second node is increased from the second voltage to the third voltage.