Single-Ended Signaling Circuit With Reflection and Echo Cancellation
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Solution Overview
Problem
Single-ended signaling in electronic circuits is prone to signal integrity issues due to reflections and echoes, which can lead to inter-symbol interference and erroneous data interpretation, especially in systems with unequal signal paths and higher clock frequencies.
Innovation Solution
Incorporating reflection cancellation and echo cancellation circuits in the transmitter path, including a reflection cancellation circuit to generate a signal with opposite polarity and equal amplitude to cancel reflections, and an echo cancellation circuit to mitigate echoes during signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-ended signaling is used to reduce pin counts and simplify transmission, then device complexity is reduced, but signal integrity deteriorates due to reflections and echoes
Solution Approach 1:
The patent converts the harmful reflections and echoes into beneficial cancellation signals. The reflection cancellation circuit generates a cancellation signal that is equal in magnitude but opposite in polarity to the reflection, causing them to cancel each other out. Similarly, the echo cancellation circuit does the same for echo signals, transforming these previously harmful phenomena into a mechanism for improving signal integrity.
Solution Approach 2:
The patent introduces intermediary circuits (reflection cancellation circuit and echo cancellation circuit) between the data driver circuit and the transmission medium. These intermediary circuits process the transmitted signal to generate cancellation signals that counteract reflections and echoes, thereby mediating the interaction between the signal and the transmission medium to improve overall signal integrity.
2Productivity
If higher clock frequencies are used to increase data transmission rate, then productivity is improved, but signal integrity deteriorates due to increased reflections and inter-symbol interference
Solution Approach 1:
The patent applies preliminary action by generating cancellation signals in advance or concurrently with the data transmission. The reflection cancellation circuit and echo cancellation circuit operate alongside the data driver circuit, preparing and transmitting cancellation signals that will counteract reflections and echoes before they can cause interference. This preliminary preparation enables higher data transmission rates while maintaining signal integrity.
3Adaptability or versatility
If unequal signal paths are used in dual-rank memory subsystems to accommodate different memory ranks, then adaptability is improved, but signal integrity deteriorates due to differential reflections and echoes
Solution Approach 1:
The patent applies local quality by providing separate reflection cancellation and echo cancellation circuits for each signal path in the dual-rank memory subsystem. Each circuit is tailored to the specific characteristics of its corresponding signal path, allowing for localized compensation of reflections and echoes. This enables the system to accommodate unequal signal paths in different memory ranks while maintaining signal integrity through path-specific cancellation.
Data Source
AI summary
Circuits for reflection cancellation in single-ended signaling are disclosed. A transmission circuit includes a control circuit configured to receive a plurality of input signals that include a plurality of symbols having at least one bit and a data driver circuit configured to generate a particular signal on a transmission medium using a particular symbol of the plurality of symbols. The transmission circuit further includes a reflection cancellation circuit configured to, after a generation of the particular signal, generate a reflection cancellation signal on the transmission medium using an inverted value of a different symbol of the plurality of symbols received prior to the particular symbol. A first composite of the particular signal and the cancellation signal is readable at a load as a value of the particular symbol, wherein the load is configured to receive a transmitted signal via the transmission medium.