Impedance adjustment circuits and methods using replicas of...

Details Impedance adjustment circuits and methods using replicas of... Impedance adjustment circuits and methods using replicas of...

2007-11-13

2007-11-13

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S027000, C326S021000, C327S108000

Reexamination Certificate

active

11247846

ABSTRACT:
An impedance adjustment circuit for controlling an impedance of a variable impedance circuit includes a calibration circuit including a replica of the variable impedance circuit and configured to generate an impedance control signal for the variable impedance circuit based on a voltage generated at the replica of the variable impedance circuit in response to a reference current. The calibration circuit may be configured to generate the reference current based on a reference resistor coupled thereto. In particular, the calibration circuit may be configured to match a current in the replica of the variable impedance circuit and a current in the reference resistor to generate the voltage at the replica of the variable impedance circuit.

REFERENCES:
patent: 5606275 (1997-02-01), Farhang et al.
patent: 6307791 (2001-10-01), Otsuka et al.
patent: 6560290 (2003-05-01), Ahn et al.
patent: 6573746 (2003-06-01), Kim et al.
patent: 2003/0117147 (2003-06-01), Song
patent: 2004/0189343 (2004-09-01), Jang
patent: 1020020041121 (2002-06-01), None
Notice to Submit Response, Korean Application No. 10-2004-0081109, Mar. 31, 2006.

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