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US 12,372,574 B2Granted
Skew detection and compensation for high speed I/O links
OwnerJong-Ru Guo, Jingbo Li +3inventors
InventorsJong-Ru Guo, Jingbo Li, Xiaoning Ye, Zuoguo Wu, Howard L. Heck
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Abstract
An apparatus may comprise a skew detection circuit to sample a common mode voltage of a differential signal, wherein the sampled common mode voltage is indicative of an amount of skew between a first signal of the differential signal and a second signal of the differential signal; and a skew compensation circuit to adjust a delay of the first signal or the second signal based on the sampled common mode voltage to reduce the amount of skew.
Claims17
An apparatus comprising:
- a skew detection circuit to sample a common mode voltage of a differential signal, wherein the sampled common mode voltage is indicative of an amount of skew between a first signal of the differential signal and a second signal of the differential signal;
- a skew compensation circuit to adjust a delay of the first signal or the second signal based on the sampled common mode voltage to reduce the amount of skew;
- and
- a selection circuit to selectively couple an output of the skew compensation circuit to the skew detection circuit or to a receiver path to detect data transmitted by the differential signal.
1 more element
A system comprising:
- a receiver comprising:
- a skew detection circuit to sample a common mode voltage of a differential signal, wherein the sampled common mode voltage is indicative of an amount of skew between a first signal of the differential signal and a second signal of the differential signal;
- a skew compensation circuit to adjust a delay of the first signal or the second signal based on the sampled common mode voltage to reduce the amount of skew;
- a receiver path to detect data transmitted by the differential signal;
- and
- a selection circuit to selectively couple an output of the skew compensation circuit to the skew detection circuit or to the receiver path;
- and
- a transmitter to transmit the differential signal over a pair of communication paths to the receiver.
5 more elements
A method comprising:
- sampling a common mode voltage of a differential signal, wherein the sampled common mode voltage is indicative of an amount of skew between a first signal of the differential signal and a second signal of the differential signal;
- adjusting a delay of the first signal or the second signal based on the sampled common mode voltage to reduce the amount of skew;
- and
- selectively coupling the differential signal to a skew detection circuit or a receiver path.
1 more element
Dependencies are inferred from the claim text.