Integrated circuits and methods for enabling high-speed AC-coupled networks to suppress noise during low-frequency operation
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United States of America Patent
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Oct 11, 2011
Grant Date -
Nov 18, 2010
app pub date -
May 16, 2009
filing date -
May 16, 2009
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Abstract
An alternating-current (AC) coupling integrated circuit (IC) suppresses signal errors introduced by a steady-state input signal. The IC includes an operational amplifier, a true direct-current (DC) bias network, a complimentary DC-bias network and first and second feedback elements. The operational amplifier has an inverting input, a non-inverting input and an output. The true DC-bias network has first and second branches that are coupled to one another and the non-inverting input. The complimentary DC-bias network has third and fourth branches that are coupled to one another and the inverting input. First and second feedback elements generate first and second control signals in response to a characteristic of one of the true input signal and the complimentary input signal. The control signals prevent the voltage at the inputs to the operational amplifier from reaching an equivalent, steady-state, DC-bias voltage.
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