Method and System for Compensating Mode Conversion Over a Communications Channel
AssigneeIntersil Americas Inc.
InventorsAndrew Joo Kim, Gwilym Luff
Life of this patent
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Abstract
A circuit can compensate for intra pair skew or mode conversion in a channel by applying a second or corrective mode conversion effect that counters the channel's mode conversion. The circuit can process the common mode signal with a frequency dependent filter prior to injection back into the differential mode. The circuit can implement the reverse mode conversion with passive circuits using integrated resistors and metal oxide semiconductor (MOS) switches. In certain embodiments, such actions can proceed effectively without necessarily consuming active power.
Claims21
A method for improving integrity of a differential signal that comprises a first signal carried over a first conductor and a second signal simultaneously carried over a second conductor extending adjacent the first conductor, the method comprising:
- processing the first signal and the second signal with a circuit that outputs a third and fourth signal each of which comprises a linear combination of the first and second signals.
A system, for processing a signal exhibiting mode conversion associated with propagation over an imperfect transmission channel, the signal comprising a common mode voltage and a differential mode voltage that are based on two voltages modulated in opposition to one another, the system comprising:
- a pair of input ports operative to receive the two modulated voltages;
- a pair of output ports operative to output compensated versions of the two modulated voltages;
- and
- a circuit extending between the pair of input ports and the pair of output ports and operative to form the compensated versions of the first and second voltages,
- the circuit comprising a pair of nodes operative to sum a controlled fraction of the common mode voltage onto the differential mode voltage to compensate for the mode conversion.
A circuit comprising:
- a pair of input lines;
- a pair of output lines;
- at least one detector, electrically coupled to the pair of input lines, operative to detect common mode voltage and differential mode voltage for a differential signal comprising mode conversion;
- and
- at least one node, electrically coupled between the at least one detector and the pair of output lines, operative to compensate for the mode conversion by applying a processed form of the common mode voltage to the differential mode voltage.
Dependencies are inferred from the claim text.