TUNING ASYMMETRY OF A DIFFERENTIAL DIGITAL INTERFACE TO CANCEL MAGNETIC COUPLING

摘要

An integrated circuit including: an RF input/output; an on-chip digital interface including a plurality of IC pin connections wherein an output current from the on-chip digital interface is split into first and second parallel paths among the plurality of IC pin connections; first and second current sources; and a controller, wherein the controller is configured to determine a plurality of mutual inductances between the plurality of IC pin connections and the RF input/output; calculate a current ratio n based upon the plurality of mutual inductances between a first current driven on the first parallel path and a second current driven on the second parallel path; drive the first current source to produce the first current and the second current source to produce the second current wherein the first and second current have the determined ratio n; and measure a voltage at the RF input/output.

主权项

1. A non-transitory medium comprising instructions configured to execute a method of cancelling cross-talk on IC pin connections of a chip, the non-transitory medium comprising:
instructions for driving a first current source to produce a first current at a first pair of IC pin connections of the chip; instructions for driving a second current source to produce a second current at a second pair of IC pin connections of the chip, wherein n is a ratio of the first and second currents; instructions for measuring a voltage at an input/output of the chip when the first and second current sources are driven; instructions for repeating the instructions for driving the first current source to produce the first current, the instructions for driving the second current source to produce the second current, and the instructions for measuring the voltage at the input/output of the chip when the first and second current sources are driven for various values of n; instructions for determining a value of n that produces a minimum voltage magnitude at the input/output of the chip.