Decision Feedback Receiver Using Dual Trip Points for Lower BER
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Solution Overview
Problem
High-speed serial communication circuits in integrated circuits face challenges with power consumption and bit error rates due to the use of differential amplifiers, which are exacerbated by increasing data rates.
Innovation Solution
The implementation of two receiver circuits with adjustable input voltage trip points and a decision circuit that selects between them based on previous output data symbols, allowing for extended data valid windows and improved bit error rates without significant power increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a differential amplifier is used to receive high-speed signals, then data transfer rate is improved, but power consumption increases
Solution Approach 1:
The receiver is divided into two separate receiver circuits, each optimized for different input voltage transition types (rising vs. falling edges). This segmentation allows each circuit to operate more efficiently for its specific transition type, reducing overall power consumption while maintaining high data transfer rates.
Solution Approach 2:
The system dynamically selects between two different receiver circuits based on the input voltage transition type. The decision circuit determines which receiver circuit to use based on whether the input signal is transitioning from low-to-high or high-to-low, optimizing power efficiency adaptively.
2Productivity
If data transfer frequency is increased, then performance is improved, but bit error rate increases
Solution Approach 1:
Each receiver circuit is specially optimized for a specific type of voltage transition (rising or falling edges). This local optimization ensures that each circuit operates at its peak performance for its designated transition type, maintaining low bit error rates even at high data transfer frequencies.
Solution Approach 2:
The system changes operational parameters by selecting different receiver circuits with different trip points based on the input transition type. This parameter adaptation allows the receiver to maintain optimal performance across different signal conditions, reducing bit errors at high speeds.
3Use of energy by moving object
If voltage level is reduced for lower power operation, then power consumption is reduced, but signal reception reliability deteriorates
Solution Approach 1:
The receiver is segmented into two specialized circuits with different trip points, allowing each to operate efficiently at lower voltage levels for its specific transition type. This segmentation enables low-power operation while maintaining reliable signal reception through optimized circuit characteristics.
Data Source
AI summary
An apparatus includes first and second receiver circuits and a decision circuit. The first receiver circuit is configured to generate a first data symbol from a particular input data symbol of a plurality of input data symbols included in an input signal. The second receiver circuit is configured to generate a second data symbol from the particular input data symbol. The decision circuit is configured to select, using respective values of one or more previous output data symbols, either the first or second data symbol as a current output data symbol. In response to a change in value between successive input data symbols, the first and second receiver circuits are configured to generate the first and second data symbols with respective data valid windows with different durations.