Impedance adjusting device

Details Impedance adjusting device Impedance adjusting device

2011-06-14

2011-06-14

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S026000, C326S027000, C327S108000, C327S112000

Reexamination Certificate

active

07961001

ABSTRACT:
An impedance adjusting device includes: a calibration node; a comparison unit configured to compare a reference voltage with a voltage of the calibration node; a counting unit configured to generatean impedance code according to a comparison result of the comparison unit; a reference impedance unit having an impedance value according to the impedance code and connected to the calibration node; a storage unit configured to store the comparison result of the comparison unit upon the generation of the impedance code being completed; an interface node; and a termination unit configured to terminate the interface node, the termination unit including a plurality of parallel resistors configured to be turned on/off according to the impedance code, and a parallel resistor configured to be turned on/off according to a value stored in the storage unit.

REFERENCES:
patent: 7218155 (2007-05-01), Chang et al.
patent: 7221193 (2007-05-01), Wang et al.
patent: 7268712 (2007-09-01), Sheen
patent: 7514954 (2009-04-01), Kim et al.
patent: 2009/0146694 (2009-06-01), Kim et al.
patent: 1020090022043 (2009-03-01), None
patent: 1020090061279 (2009-06-01), None

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