Circuit and method for controlling termination impedance

Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination

Reexamination Certificate

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Details

C326S026000

Reexamination Certificate

active

07667483

ABSTRACT:
A calibration circuit that can prevent a calibration operation from being delayed by a dummy capacitor when the calibration circuit starts to operate includes a switch unit configured to connect a calibration node to a precharge node in response to an enable signal. The calibration node is connected to an external resistor. The calibration circuit also includes a code generation unit configured to generate a calibration code in response to a voltage of the calibration node and a reference voltage, a calibration resistor unit configured to drive the calibration node in response to the calibration code and turn-off when the code generation unit is disabled, and a precharge unit configured to precharge the precharge node to a predetermined voltage level when the code generation unit is disabled.

REFERENCES:
patent: 6747475 (2004-06-01), Yuffe et al.
patent: 7288959 (2007-10-01), Lee
patent: 7304495 (2007-12-01), Nygren
patent: 1020030090882 (2003-12-01), None
patent: 1020030096564 (2003-12-01), None
Notice of Allowance issued from Korean Intellectual Property Office on Apr. 30, 2009 with an English Translation.

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