Signal Receiver Circuit Weight Adjustment for ISI Compensation
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Solution Overview
Problem
The limited bandwidth of channels in electrical systems leads to distortion due to ISI, reducing the performance of transmitting/receiving components, and existing decision feedback equalizers face challenges in setting optimal weights for precise compensation.
Innovation Solution
A signal receiver circuit with a receiver, compensator, and weight adjuster that compares input signals with reference and target voltages during normal and training operations, adjusting weights based on signal levels to compensate for ISI, and operates with multiple phase clocks for multi-tap compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a decision feedback equalizer is used to compensate for ISI distortion, then signal reception accuracy is improved, but the complexity of weight adjustment increases
Solution Approach 1:
The patent implements a training operation phase before normal signal reception, during which the weight adjuster pre-adjusts the compensator weights using known training signals. This preliminary weight adjustment eliminates the need for complex real-time weight optimization during actual data reception, thereby improving signal reception accuracy while managing adjustment complexity through temporal separation of functions.
2Reliability
If the bandwidth of the channel is increased to reduce ISI distortion, then signal transmission quality is improved, but the hardware cost and power consumption increase
Solution Approach 1:
Instead of increasing channel bandwidth with additional hardware resources, the patent changes the operational parameters by implementing adaptive weight adjustment through multi-phase training operations. The system maintains the existing channel bandwidth but improves signal transmission quality by dynamically adjusting the compensator weights based on training signals, thereby achieving better reliability without increasing hardware quantity.
3Measurement precision
If multiple phase clocks are used for multi-tap compensation, then compensation precision is improved, but the device complexity increases
Solution Approach 1:
The patent divides the compensation operation into multiple segments corresponding to different time taps, with each tap processed by dedicated circuitry. Multiple phase clocks are used to sequentially activate different tap compensators during the training operation, allowing precise multi-tap compensation while managing circuit complexity through time-multiplexed operation rather than simultaneous activation of all taps.
Data Source
AI summary
A signal receiver circuit may include: a receiver suitable for generating a received signal based on comparison of an input signal with a reference voltage during a normal operation and based on comparison of the input signal with a target voltage during a training operation; a compensator suitable for applying a weight to the received signal to compensate for the input signal; and a weight adjuster suitable for adjusting the weight based on a level of the received signal during the training operation, wherein during the training operation, the input signal toggles between first and second levels, and the receiver is enabled when the input signal is at the first level.