GROUND OFFSET MONITOR AND COMPENSATOR

摘要

Methods and systems are described for monitoring and compensating an offset between a reference voltage used in a first device and a corresponding reference voltage used in a second device. The first device can include offset circuitry. The offset circuitry receives two voltage signals. The first voltage signal is equal to a first voltage value that is used as a reference voltage in the first device. The second voltage signal can be a time-varying voltage signal that has a known relationship with a second voltage value that is used as a reference voltage in the second device. The offset circuitry can then determine the second voltage value from the second voltage signal, and output an offset value based on a difference between the first voltage value and the second voltage value.

主权项

1. A circuit, comprising:
a ground-offset-monitor circuit to determine an offset voltage value based on a difference between a first reference voltage value of a first device and a second reference voltage value of a second device, wherein the ground-offset-monitor circuit receives a voltage signal from the second device, and wherein the ground-offset-monitor circuit determines the second reference voltage value of the second device based on a known relationship between the voltage signal received from the second device and the second reference voltage value of the second device; and a power management circuit to adjust an amount of current that is used for charging a battery of the first device based on the offset voltage value.