Importance

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Abstract

A source-terminated transmitter conveys digital signals over a short channel as a voltage signal that transitions between levels for each symbol transition. The transmitter produces each transition by issuing a charge pulse onto the channel, and thus creates a series of charge pulses. The number of charge pulses per unit time is proportional to the transition density of the signal, as no charge pulse is required between like symbols. The supply current used to deliver the pulses is therefore dependent upon the data pattern. This data dependency can induce supply fluctuations, which can in turn cause errors and otherwise reduce performance. The transmitter issues a synthetic charge pulse for each adjacent pair of like symbols to reduce the data dependency of the supply current. The synthetic pulses can be scaled to match the charge required for symbol transitions on a given channel.

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First Claim