CURRENT SENSING WITH COMPENSATION FOR COMPONENT VARIATIONS

摘要

A system can provide current detection in an integrated circuit (IC) chip while compensating for variations in circuit components resulting from process, voltage supply, temperature, or combinations thereof. The system can include the IC chip that has a power switch circuit that includes a power circuit path including a first transistor connected to a power source through a first conductive trace that has a first resistance value, and to a load by a second conductive trace having a second resistance value. A current detection circuit is configured to compensate for the variations in the power switch circuit using a sense circuit path that is configured to match process, voltage supply, and temperature variations in the power circuit path.

主权项

1. A system for providing current detection in an integrated circuit (IC) chip while compensating for variations in circuit components resulting from process, voltage supply, temperature, or combinations thereof, the system comprising:
the IC chip including:
a power switch circuit that includes a power circuit path including a first transistor connected to:
a power source through a first conductive trace that has a first resistance value, anda load through a second conductive trace having a second resistance value; anda current detection circuit configured to compensate for the variations in the power switch circuit, the current detection circuit including:
a current source circuit,a sense circuit path that is configured to match process, voltage supply, and temperature variations in the power circuit path, the sense circuit path including a second transistor connected to the power source by a third conductive trace having a third resistance value and to the current source circuit by a fourth conductive trace having a fourth resistance value, anda comparator circuit configured to compare a voltage drop across the power circuit path to a voltage drop across the sense circuit path and, in response to the comparison, provide a data signal to an output of the current detection circuit.