Impedance matching circuit and semiconductor memory device...

Details Impedance matching circuit and semiconductor memory device... Impedance matching circuit and semiconductor memory device...

2007-12-31

2009-08-11

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S086000

Reexamination Certificate

active

07573289

ABSTRACT:
An impedance matching circuit includes a code generating unit for generating a calibration code in response to a reference voltage and a voltage on a node, a calibration resistance unit for supplying a power supply voltage to the node, being calibrated to an external resistor, wherein the calibration resistance unit includes a switching unit for turning on/off a plurality of resistors connected in parallel in response to the calibration code, a termination pull-up resistance unit provided at an output node for receiving the calibration code, wherein the termination pull-up resistance unit has a switching unit which is identical to that of the calibration resistance unit, and a termination pull-down resistance unit at the output node, for receiving the calibration code, wherein the termination pull-down resistance unit has a switching unit which is identical to that of the calibration resistance unit.

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