Oracle International Corporation

Ranjan Vaish

Rajesh Kumar

Jianghui Su

Zuxu Qin

Muthukumar Vairavan

Long Kong

An embodiment includes a first feedback tap, a second feedback tap, and a summation circuit. The summation circuit may include a first load and a second load coupled to each other at an internal circuit node, and coupled in series between a power supply node and an output node. The summation circuit may be configured to receive, via a serial communication link, an input signal indicative of a series of data symbols, and to generate an output voltage level on the output node based upon a current data symbol. The first feedback tap, coupled to the output node, may be configured to sink a first current from the output node based upon a first previously received data symbol. The second feedback tap, coupled to an intermediate circuit node, may be configured to sink a second current from the intermediate circuit node based upon a second previously received data symbol.

Decision feedback equalizer with distributed R-C network

Embodiments include systems and methods for providing fast direct feedback to correct decision feedback equalization (DFE) in receiver circuits. Embodiments can provide direct feedback for DFE correction in a manner that is effective in high-speed data channels, while manifesting less latency, power consumption, and/or area than conventional DFE implementations. In some implementations, in each clock cycle (e.g., Tn), implementations can select (e.g., using a multiplexer) between a positive reference signal and a negative reference signal (e.g., both reference signals generated according to an inter-symbol interference magnitude for a data channel) according to a decision feedback signal from a previous clock cycle (Tn&#x2212;1). The selected reference signal can be compared (e.g., in the same clock cycle Tn, using a comparator) with an input data signal to generated an updated decision feedback signal for a next clock cycle (e.g., Tn+1).

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Fremont, CA, United States of America

Ranjan Vaish