Crosstalk compensation for high speed, reduced swing circuits
AssigneeInternational Business Machines Corporation
InventorsPrasad S. Nalawade, Veena Prabhu, Krishnan S. Rengarajan
Life of this patent
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Abstract
Structures and methods are provided for reducing or eliminating crosstalk in devices. Based on a predetermined compensation schemes, a compensation scheme is selected that minimizes the deviation of the non-aggressed victim signal caused by one or more aggressor signals. Instances of a compensation circuit corresponding to the selected compensation scheme are placed along a victim signal line at locations defined by the compensation scheme.
Claims20
A crosstalk compensation structure between an aggressor and a victim comprising:
- a signal buffer comprising a first inverter and a second inverter connected in series in the aggressor;
- and
- a compensation circuit linking the signal buffer to the victim via a first capacitor, wherein the compensation circuit is structured and arranged to reduce distortion of a signal in the victim by reducing crosstalk between the aggressor and the victim.
A method for compensating for crosstalk coupling between aggressors and victims in a device design, comprising:
- identifying a victim having one or more aggressors;
- determining crosstalk attributes of the victim and the one or more aggressors;
- for a plurality of predetermined compensation schemes, determining a deviation between a non-aggressed victim signal and an aggression-compensated victim signal;
- and
- selecting one of the plurality of the predetermined compensation schemes that minimizes the determined deviation from the non-aggressed victim signal,
- wherein the identifying, the determining crosstalk attributes and the determining the deviation and the selecting are performed using a computing device.
A system comprising:
- a compensation circuit connecting a first signal line to a second signal line of an integrated circuit, wherein the compensation circuit is structured and arranged to reduce distortion of a signal in the second signal line by reducing the effect of crosstalk between the first and second signal lines;
- the crosstalk is caused by capacitive coupling between the first and second signal lines;
- the compensation circuit provides a compensation signal that is substantially a same magnitude and opposite polarity as the capacitive coupling;
- and
- the compensation circuit comprises a compensation line connecting the first signal line and the second signal line, and a compensation capacitor in the compensation line.
Dependencies are inferred from the claim text.