Patent ID: 8829943

Claim:
A disconnect detection circuit, comprising: a first input transistor coupled to receive a first input signal; a second input transistor coupled to receive a second input signal; regulating circuitry operable to produce a regulated voltage for controlling a plurality of current sources, the plurality of current sources including a first source transistor and a second source transistor, wherein a source-drain path of the second source transistor is directly connected to a source-drain path of the second input transistor; a resistor coupled in series between a source-drain path of the first source transistor and a source-drain path of the first input transistor; and circuitry operable to compare a first signal generated at a first node where the source-drain path of the first source transistor is coupled in series with the resistor to a second signal generated at a second node where the source-drain paths of the second source transistor and second input transistor are directly connected and generate a disconnect signal in response to the comparison.