System and method to actively drive the common mode voltage of a receiver termination network
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United States of America Patent
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May 5, 2015
Grant Date -
Mar 20, 2014
app pub date -
Sep 14, 2012
filing date -
Sep 14, 2012
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Abstract
An active termination circuit for a differential receiver includes a first receiver element configured to receive a first component of a differential signal, a second receiver element configured to receive a second component of a differential signal, a common mode measurement element configured to receive the differential signal and generate a transmit common mode signal (Vcm) representing an average value of the differential signal, and a receiver (RX) common mode signal node. The termination circuit also comprises an active element configured to receive the transmit common mode signal (Vcm) and provide an output to the receiver common mode signal node, the output configured to drive the value of the signal at the receiver common mode signal node to the value of the transmit common mode signal (Vcm), and a capacitive element coupled to the receiver common mode signal node in parallel with the active element.
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