CM CLAMPING METHODS AND CIRCUITS FOR WIRED COMMUNICATION APPLICATIONS

摘要

A device for common mode (CM) clamping in wired communication includes a first circuit and a second circuit. The first circuit is configured to sense a voltage signal across clamp terminals and to generate an output voltage signal based on the sensed voltage signal. The second circuit is configured to compare the output voltage signal with a reference voltage, to generate a pair of current signals based on a result of the comparison, and to provide the pair of current signals to the clamp terminals. The pair of current signals includes a matched pair of CM current signals. The clamp terminals, upon coupling to nodes of a main circuit provide a desired CM impedance between the nodes of the main circuit. The device can be coupled to the main circuit in conjunction with one or more off-chip magnetic components.

主权项

1. A device for common mode (CM) clamping in wired communication, the device comprising:
a first circuit configured to sense a voltage signal across clamp terminals and to generate an output voltage signal based on the sensed voltage signal; and a second circuit configured to:
compare the output voltage signal with a reference voltage;generate a pair of current signals based on a result of the comparison; andprovide the pair of current signals to the clamp terminals, wherein:
the pair of current signals comprise a matched pair of CM current signals, andthe clamp terminals, upon coupling to nodes of a main circuit provides a desired CM impedance between the nodes of the main circuit.