Back to results
US 6,557,066 B1Granted
Method and apparatus for data dependent, dual level output driver
AssigneeLSI Logic Corporation
InventorsHarold S. Crafts, John B. Lohmeyer
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeLSI Logic Corporation
InventorsHarold S. Crafts, John B. Lohmeyer
Estimating the term…
The inter-symbol interference problem is reduced by detecting a data sequence indicating when a boost is needed on a ‘short pulse’, usually the first data pulse of the opposite polarity after a string of data pulses of the same value. A data decoder that detects when current compensation is required and an output driver that has the variable drive capability to change the drive current on the short pulse is used to boost the amplitude. The output driver is regulated by a phase locked loop which includes a voltage variable delay digitally controlled voltage variable reference capacitors in the phase locked loop circuit for receiving data from memory that contains the proper capacitor control voltage needed. The time required to charge the capacitor is constant and the delay is slaved to the clock period.
An inter-symbol interface output driver system for reducing the effects on a bus comprising:
An inter-symbol interference output driver system for reducing the effects on a bus comprising:
A method for reducing inter-symbol interference effects on a bus comprising:
A method for reducing inter-symbol interference effects on a bus comprising:
Dependencies are inferred from the claim text.