Lsi Logic Corporation

Lsi Corporation

Jeff Kueng

Mark J Marlett

Cathy Ye Liu

Justin J Kraus

Philip N Jenkins

An apparatus comprises a summer suitable for subtracting a filtered feedback signal from an input; a symbol decision device suitable for receiving an output from the summer; a feedback filter suitable for filtering an output from the symbol decision device and for sending the filtered feedback signal to the summer, the feedback filter comprising an adjustable swing amplifier and an adjustable pole filter; and an adaptation algorithm suitable for simultaneously adapting both a pole setting and a swing setting based upon a least mean squared error criteria. The summer, the symbol decision device, and the feedback filter form a feedback circuit utilized to reconstruct an electrical signal distorted during transmission.

Continuous time&#x2014;decision feedback equalizer

A circuit configured to correct a duty cycle error or vary the duty cycle of a clock signal. The circuit includes a differential amplifier or control circuit that receives differential signal inputs. At least one differential pair of transistors is connected to outputs of the differential amplifier or control circuit. Outputs of the one or more differential pairs of transistors are connected to inputs of a differential circuit. The differential amplifier or control circuit is connected to the outputs of the differential circuit. The one or more differential pairs of transistors is configured to change a DC level of at least one of the inputs of the differential circuit in order to shift a cross over point of the inputs of the differential circuit and thereby effect a duty cycle change (or correction) at the outputs of the differential circuit.

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New Brighton, MN, United States of America

Jeff Kueng