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US 6,549,031 B1Granted
Point to point alternating current (AC) impedance compensation for impedance mismatch
AssigneeIntel Corporation
InventorsJerry G. Jex, Arnaud Forestier, Kersi Vakil, Abhimanyu Kolla
Life of this patent
Estimating the term…
Abstract
Point-to-point AC impedance compensation calculates and matches AC impedance for integrated circuit input and output buffers, taking into consideration impedances of printed circuit boards, connectors, cards, cables, and/or other interfaces on a computer bus, upon computer system power-up or on demand during operation using no additional package pins or traces in the printed circuit board, connector, card, or cable.
Claims22
A system, comprising:
- a first printed circuit board;
- a transmission path;
- and
- a second printed circuit board coupled to the first printed circuit board via the transmission path, the first and second printed circuit boards each having logic to compensate for alternating current (AC) values of the first printed circuit board to match AC impedance values of the second printed circuit board and the transmission path.
1 more element
A system, comprising:
- a first device;
- a transmission path;
- and
- a second device coupled to the first device via the transmission path, the first and second devices each having logic to adjust alternating current (AC) values of the first device to match AC impedance values of the second device and the transmission path.
1 more element
A method, comprising:
- transmitting a first wave signal via a first trace on a transmission path to a target device, the first wave signal to indicate a first impedance value for a driver on the transmission path and receiving a first reply signal from the target device via at least one secondary trace on the transmission path;
- transmitting a second wave signal via the first trace to the target device, the second wave signal to indicate a second impedance value for the driver and receiving a second reply signal from the target device via the secondary trace to indicate a relationship between the first wave signal and the second wave signal;
- and
- transmitting a third set of wave signals to the target device via the first trace to indicate a third set of impedance values of the driver and receiving a third set of replies from the target device until a reply in the third set of replies indicates that a predetermined impedance value for the driver is obtained.
1 more element
Dependencies are inferred from the claim text.