Receiver Circuitry for Signal Attenuation Compensation
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Solution Overview
Problem
Existing data communication systems face challenges in compensating for signal losses, such as attenuation and phase shift, which vary with frequency and over time, especially in different transmission media, requiring adaptive equalization methods to maintain signal quality, particularly at high data rates.
Innovation Solution
A receiver configuration with an equalization circuit and a signal normalization circuit, controlled by a control circuit, adjusts frequency content and signal amplitude/slope to compensate for signal losses, allowing flexible operation across different modes and devices by apportioning frequency adjustments between the two circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive equalization is used to compensate for signal losses, then signal quality is improved, but device complexity increases
Solution Approach 1:
The equalization function is divided into two separate circuits: an equalization circuit for frequency-dependent loss compensation and a signal normalization circuit for amplitude and slope normalization. This segmentation allows each circuit to be optimized independently, improving signal quality while managing complexity through functional separation.
Solution Approach 2:
The system employs adaptive equalization where the equalization circuit dynamically adjusts its parameters based on detected signal characteristics. The control circuit modifies equalization parameters in real-time to compensate for varying transmission losses, maintaining signal quality under changing conditions.
2Reliability
If frequency-dependent equalization is applied, then signal attenuation compensation is improved, but circuit complexity increases
Solution Approach 1:
The patent separates attenuation compensation (frequency-dependent equalization) from amplitude normalization into distinct circuits. The equalization circuit specifically addresses frequency-dependent losses through targeted frequency response adjustment, while the normalization circuit handles overall amplitude levels, reducing the complexity burden on any single circuit.
Solution Approach 2:
The equalization circuit applies frequency-selective compensation, targeting specific frequency ranges where attenuation occurs most severely. Rather than uniformly processing all frequencies, the circuit applies localized adjustment to problematic frequency bands, improving attenuation compensation efficiency while minimizing unnecessary complexity.
3Adaptability or versatility
If signal normalization is performed separately from equalization, then adaptability to different devices is improved, but device complexity increases
Solution Approach 1:
The patent implements separate equalization and signal normalization circuits, each with independent control parameters. This allows the receiver to be configured for different transmission media and devices by adjusting parameters in each circuit independently, significantly improving adaptability while the modular structure helps manage the added complexity.
Solution Approach 2:
The dual-circuit architecture provides universal functionality that can accommodate various transmission media (cables, backplanes, wireless) and data rates. By separating equalization from normalization, the system can be universally applied across different applications while maintaining optimized performance for each specific use case through parameter adjustment.
Data Source
AI summary
Systems and methods for adjusting a signal received from a communication path are disclosed. A receiver can receive a signal from a communication path which attenuates at least some frequency components of the signal. The receiver can include an equalization block that adjusts at least some of the frequency content of the received signal, a signal normalization block that provides a normalized signal amplitude and/or a normalized edge slope, and a control block. In one embodiment, the control block controls frequency adjustment in the equalization block for high frequencies. For low frequency adjustment, user-programmable parameters control the normalized signal amplitude in the signal normalization block and the low frequency adjustment in the equalization block.