Back to results
US 7,072,463 B1Granted
Apparatus and method for programmable line interface impedance matching
AssigneeIntel Corporation
InventorsRussell Byrd, James M. Little
Life of this patent
Estimating the term…
Abstract
A line interface capable of connecting to a variety of transport mediums, each having a different impedance. The line interface comprises a programmable resistor. The programmable resistor along with an external resistor provide a range of resistor values which are used to substantially match the impedance requirements of the various transport mediums.
Claims12
In a line interface having a programmable resistor, a method of matching an impedance of a transport medium comprising:
- determining the resistance of the IC corresponding to a first configuration of parallel resistors, wherein a portion of the parallel resistors are enabled, at least one or more of the parallel resistors being disposed within the IC;
- modifying the resistance of the IC by creating a second configuration of parallel resistors, wherein a different portion of the parallel resistors are enabled;
- and
- wherein a desired impedance is provided by a combination of the resistance of the IC and an external terminating impedance external to the IC.
1 more element
In a line interface having a programmable resistor, a method of matching an impedance of a transport medium comprising:
- writing to a register that controls the programmable resistor, wherein the programmable resistor is disposed within an integrated circuit to couple to the transport medium;
- and
- changing the programmable resistor to provide an effective impedance substantially matching the impedance of the transport medium responsive to writing to the register, wherein the effective impedance is provided by a combination of the programmable resistor and a terminating impedance external to the integrated circuit.
Dependencies are inferred from the claim text.