Output driver having output impedance adaptable to supply voltage and method of use
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United States of America Patent
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Aug 16, 2016
Issued Date -
N/A
app pub date -
Feb 21, 2015
filing date -
Feb 21, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An output driver is provided that adapts an output impedance of the output driver to the voltage level of a power supply, thereby providing a constant output impedance over a range of different operating voltages. The output driver includes a plurality of individual driver circuits, each one of the plurality of individual driver circuits configured to provide a plurality of predetermined output impedances in response to a plurality of power supply voltage level inputs and a decoder. The decoder of the output driver is configured for receiving a digital codeword representative of a voltage level of a power supply coupled to the output driver and for decoding the digital codeword to activate one or more of the individual driver circuits to provide a constant output impedance from the output driver in response to the voltage level of the power supply coupled to the output driver, wherein the constant output impedance is a combination of the predetermined output impedances of the activated individual driver circuits.
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