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US 2003/0076129 A1Published application
Clockless impedance controller
AssigneeInternational Business Machines Corporation
InventorsKenneth J. Goodnow, Riyon Harding
Life of this patent
Estimating the term…
Abstract
An impedance controller comprises impedance control logic outputting an adjustable impedance and a comparator comparing the adjustable impedance with a reference voltage. The impedance control logic recalibrates said adjustable impedance only when said comparator indicates a change in impedance.
Claims20
An impedance controller comprising:
- impedance control logic outputting an adjustable impedance;
- and
- a comparator comparing said adjustable impedance with a reference voltage, wherein said impedance control logic recalibrates said adjustable impedance only when said comparator indicates a change in impedance.
An impedance controller comprising:
- impedance control logic outputting an adjustable impedance;
- and
- at least one set of dual comparators comparing a high value of said adjustable impedance with a reference voltage and a low value of said adjustable impedance with said reference voltage,
- wherein said impedance control logic recalibrates said adjustable impedance only when said comparator indicates that said reference voltage is above said high value or below said low value.
1 more element
An impedance controller connected to a circuit controlled by a system clock, said impedance controller comprising:
- impedance control logic outputting an adjustable impedance;
- and
- a comparator comparing said adjustable impedance with a reference voltage, wherein said impedance control logic recalibrates said adjustable impedance only when said comparator indicates a change in impedance and independently of said system clock signal.
Dependencies are inferred from the claim text.