Oracle International Corporation

Oracle America, Inc.

Baoqing Huang

Dawei Huang

Zuxu Qin

Drew George Doblar

Jianghui Su

Deqiang Song

Yan Yan

Arif Al Amin

Philip P Kwan

Waseem Ahmad

Kuai Yin

Maoqing Yao

Embodiments include systems and methods for transmitting data over high-speed data channels in context of serializer/deserializer circuits. Some embodiments include a novel full-rate source-series-terminated (SST) transmitter driver architecture with output charge sharing isolation. Certain implementations have a programmable floating tap (e.g., in addition to standard taps) with both positive and negative FIR values and cursor reduction, which can help achieve large FIR range and high channel equalization capability. Some embodiments operate with multi-phase clocking having phased clock error correction, which can facilitate operation with low-jitter and low-DCD clocks. Some implementations also include novel output inductor structures that are disposed to partially overlap output interface bumps.

Full-rate transmitter

A method and apparatus for duty cycle distortion compensation is disclosed. In one embodiment, an integrated circuit includes a differential signal transmitter having a main data path and a compensation data path. The main data path includes a first and second differential driver circuits each having output terminals coupled to a differential output. A transmission controller is configured to transmit data into the main and compensation data paths, the data corresponding to pairs of sequentially transmitted bits including an odd data bit followed by an even data bit, and further configured to determine respective duty cycle widths for each of the odd and even data bits as received by the transmission controller. The transmission controller is configured to cause the first and second driver circuits to equalize the respective duty cycle widths of the odd and even data bits, as transmitted, based their respective duty cycle widths as received.

Method and apparatus for duty cycle distortion compensation

An linear equalizer system for a transmission channel includes an active inductor with a tunable inductance and quality factor. The active inductor includes a transconducting element. A current steering digital to analog converter controls the flow of a bias current through the transconducting element to tune the active inductor.

Equalizer system having a tunable active inductor

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Redwood City, CA, United States of America

Baoqing Huang