Adaptive Serial Equalizer Peak Gain Control at Nyquist Frequency
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Solution Overview
Problem
Existing adaptive equalizer systems for high-speed serial data face complexity in circuitry implementation for attenuation estimation, making it difficult to simplify the process.
Innovation Solution
An adaptive equalizer system with a control circuit that adjusts the peak gain of equalizers by down-converting input signals to different frequencies, comparing the components, and generating control signals to maintain a predetermined DC power difference, thereby simplifying the circuitry for attenuation compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional attenuation estimation circuitry is used for adaptive equalization, then signal integrity can be restored, but the circuit complexity becomes high and implementation becomes difficult
Solution Approach 1:
The patent changes the parameter being controlled from general attenuation estimation to specifically controlling the peak gain at Nyquist frequency. This is achieved by down-converting the equalized signal to baseband and using a peak detection circuit to detect the peak gain, then feeding this back to adjust the equalizer coefficients. This parameter-focused approach simplifies the circuit while maintaining signal integrity restoration.
Solution Approach 2:
The patent extracts only the essential function needed for adaptive equalization - peak gain control at Nyquist frequency - from the complex traditional attenuation estimation circuitry. By using a down-converter to shift the signal to baseband and a peak detection circuit to identify the peak gain, the system isolates and implements only the critical control function, eliminating unnecessary circuit complexity.
2Adaptability or versatility
If the equalizer peak gain is adjusted to maintain DC power difference, then adaptability to practical requirements is improved, but the control circuit complexity increases
Solution Approach 1:
The patent implements a self-adjusting control system where the peak detection circuit automatically detects the peak gain of the equalized signal and feeds this information back to the equalizer control. This closed-loop self-service mechanism enables the equalizer to automatically adapt to different transmission conditions and maintain optimal DC power difference without requiring complex external control circuitry, achieving adaptability through self-regulation.
Data Source
AI summary
An equalizer system includes at least one equalizer configured to equalize an input signal to generate an equalized input signal; a limiting amplifier coupled to the at least one equalizer, and configured to amplify the equalized input signal to a saturated level to generate an output signal; and a control circuit coupled to the at least one equalizer and the limiting amplifier, and configured to generate at least one control signal to the at least one equalizer according to the equalized input signal to adjust a peak gain of the at least one equalizer, wherein the peak gain of the at least one equalizer is at a Nyquist frequency.