Switched Equalizer with Positive Feedback for High-Frequency Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing digital data transmission systems face challenges with high power consumption and significant area usage due to techniques like continuous time linear equalizers, which are inefficient for correcting high-frequency loss in non-ideal channels.
Innovation Solution
A switched equalizer system with a low-pass filter and positive feedback enhancement, utilizing a switch to interchange signal signs at the Nyquist frequency, followed by digitization and inversion to restore the signal, effectively equalizing frequency response with reduced power consumption and area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous time linear equalizer is used to correct high frequency loss, then equalization performance is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic switching action at the Nyquist frequency to achieve equalization. The switch periodically interchanges the complementary signals, creating a time-varying system that effectively compensates for high-frequency loss without requiring continuous high-power amplification at the Nyquist frequency, thus reducing power consumption while maintaining equalization performance.
Solution Approach 2:
The patent replaces the traditional continuous-time linear equalizer (analog system) with a switched-capacitor system that uses periodic switching to achieve the same equalization effect. This substitution allows the system to achieve frequency peaking through switching action rather than through continuous high-frequency amplification, significantly reducing power consumption.
2Reliability
If continuous time linear equalizer is used to correct high frequency loss, then equalization performance is improved, but area consumption increases
Solution Approach 1:
By using periodic switching at the Nyquist frequency rather than continuous high-frequency amplification, the patent achieves equalization with simpler circuitry that requires fewer components and occupies less chip area. The time-varying nature of the switched system allows for more compact implementation compared to traditional continuous-time equalizers.
Solution Approach 2:
The replacement of the continuous-time linear equalizer with a switched-capacitor system reduces the area requirement. The switched system uses capacitors and switches instead of continuous high-frequency amplifiers, which are inherently more area-intensive. This substitution enables compact integration on the chip while maintaining equalization functionality.
3Reliability
If explicit peaking at Nyquist frequency is implemented, then high frequency loss correction is improved, but power consumption increases
Solution Approach 1:
The patent achieves frequency peaking at the Nyquist frequency through periodic switching action rather than through continuous amplification. The switch toggles at the Nyquist frequency, creating an effective frequency response with peaking at the desired frequency point. This periodic action achieves the same spectral shaping effect as explicit peaking but with dramatically reduced power consumption by avoiding continuous high-frequency current flow.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides efficient equalization of data transmission channels with reduced power consumption and area usage, effectively correcting high-frequency losses while maintaining signal integrity.
Implementation Method 1
a low-pass filter connected to the first switch, the low-pass filter including an amplifier with positive feedback
Data Source
AI summary
A switched equalizer for equalizing the frequency response of a channel with high-frequency attenuation. In one embodiment the differential input of the equalizer is fed to a switch that interchanges the complementary signals at the differential input, changing the sign of the received signal, at each transition of a clock at the Nyquist frequency. The switched signal is filtered by a low-pass filter with positive feedback enhancement at DC gain and digitized by a sense amplifier, and the digital output of the sense amplifier is inverted during every half-cycle of clock at the Nyquist frequency, restoring the sign of the input signal.