Circuits for impedance adjustment having multiple termination devices with switchable resistances and methods of adjusting impedance
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United States of America Patent
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Apr 11, 2017
Issued Date -
N/A
app pub date -
Mar 5, 2015
filing date -
Mar 5, 2015
priority date (Note) -
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Abstract
Integrated circuit devices and methods of operating integrated circuit devices are useful in impedance adjustment. Integrated circuit devices include a signal driver circuit having an output node, a voltage node, and a first termination device and a second termination device connected in parallel between the voltage node and the output node. The first termination device and the second termination device each have a particular configuration of switchable resistances, and different strengths. Methods include connecting a node of the integrated circuit device to a first voltage node through a reference resistance, connecting the node to a second voltage node through a termination device, adjusting a resistance value of the termination device and comparing a resulting voltage level to a reference voltage. The reference voltage has a voltage level different than half-way between a voltage level of the first voltage node and a voltage level of the second voltage node.
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