Cadence Design Systems, Inc.

Chris Moscone

Benjamin Louis Heilmann

Eric Harris Naviasky

Loren Blair Reiss

Scott David Huss

James Dennis Vandersand, Jr

Randall Smith

Rajagopal Vijayaraghavan

A system and method are provided for phase recovery of a signal received by a receiver having digital equalization. A sample acquisition unit periodically acquires a plurality of I and Q samples of the received signal. The sample acquisition unit includes a delay portion to enable selective mutual comparisons between a current I sample ID0, a first preceding I samples ID1, and a second preceding I sample ID2. A transition detection unit generates at least one transition detect signal responsive to the ID1, ID0, and Q samples. The transition detect signal indicates a logic state transition in the received signal between the ID1 and ID0 samples. A transition filtering unit generates an equalization detect signal indicative of excessive equalizing correction of the received signal at the ID0 sample, and selectively passes in response the transition detect signal as a timing output signal.

System and method for phase recovery with selective mitigation of timing corruption due to digital receiver equalization

The present disclosure relates to a method for use with a serializer/deserializer comprising. The method may include grouping one or more lane modules associated with an integrated circuit (IC) together to form a link, wherein each of the one or more lane modules includes a reset state machine and a high speed reset generator. The method may also include providing a common module having a common reset release state machine and a reset release synchronizer and pulse generator, the common module and one or more lane modules being configured to communicate therebetween. The method may further include resetting each link independently using the one or more lane modules.

Method for link resets in a SerDes system

A system and method are provided for combined generation of I and Q signal references according to a periodic input signal and selective phase interpolation of an output signal with reference thereto. A ring oscillator portion generates an oscillator signal, and includes a plurality of delay stages interconnected in cascade to collectively execute an odd number of signal state inversions within a closed loop. The delay stages establish at respective nodes defined therebetween correspondingly delayed oscillator signal versions, successively shifted in phase by a predetermined phase difference. A signal injection portion selectively applies to at least one node of the ring oscillator portion a current bias according to the periodic input signal, and selectively adjusts each current bias in amplitude. The oscillator signal is thereby frequency locked to the periodic input signal, defining I/Q references with respect to the delayed oscillator signal version established at the current biased node.

System and method for combined I/Q generation and selective phase interpolation

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Cary, NC, United States of America

Chris Moscone