Multi-standard, automatic impedance controlled driver with supply regulation
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United States of America Patent
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Oct 27, 2020
Grant Date -
Nov 9, 2017
app pub date -
Jul 24, 2017
filing date -
Aug 1, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pre-driver circuit generates a driver bias signal based on a swing command, a driver impedance characteristic, and an input signal. A driver receives the driver bias signal and generates, in response, a driver signal having a swing and having an output impedance corresponding to the bias signal. Optionally, the driver receives power from a switchable one of multiple supply rails, according to the swing. Optionally, the driver has voltage controlled resistor elements and the driver bias signal is generated based on the swing command and a replica of the driver voltage controlled resistor elements.
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