Adaptive Equalizer Circuit With Offset Correction for Broad Bandwidths
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Solution Overview
Problem
Existing continuous time equalizers with constant circuit parameters are limited in frequency range compensation, failing to meet requirements when input signals have a broader frequency range.
Innovation Solution
The equalizer device incorporates multiple equalizer circuits and gain stage circuits with adaptive circuit parameter adjustment mechanisms, including digital and analog offset correction circuits, to compensate for channel attenuation and amplify signals effectively across varying frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If constant circuit parameters are used in the equalizer, then the circuit structure is simple, but the frequency range for channel compensation is limited
Solution Approach 1:
The patent implements dynamic circuit parameters by introducing variable resistors and variable capacitors that can be adjusted based on the frequency characteristics of the input signal. The equalizer circuit transitions from static to dynamic operation, allowing the time constant (RC) to be varied adaptively to match different frequency ranges, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent changes the physical parameters of the circuit by using adjustable resistance and capacitance values. The control circuit modifies the R and C parameters dynamically to optimize the equalizer's frequency response for different signal conditions, enabling broad frequency compensation while maintaining a relatively compact circuit structure through parameter optimization rather than structural expansion.
2Adaptability or versatility
If constant capacitance values and resistance values are used, then the manufacturing precision is easier to control, but the equalizer fails to meet requirements for broader frequency ranges
Solution Approach 1:
The patent employs dynamic adjustment mechanisms where the capacitance and resistance values are no longer fixed but can be varied under control. This allows the equalizer to adapt to different frequency requirements by changing its time constant, achieving broad frequency coverage while the control system manages the precision requirements through automated adjustment rather than relying solely on high-precision fixed components.
Solution Approach 2:
The patent creates a universal equalizer circuit that can handle multiple frequency ranges by incorporating adjustable R and C elements. The same circuit structure serves multiple functions across different frequency bands, reducing the need for multiple specialized circuits and thereby managing manufacturing complexity while achieving broad adaptability.
3Adaptability or versatility
If the equalizer circuit is designed for a specific frequency range, then the circuit parameters are simple, but it cannot compensate for signals with broader frequency ranges
Solution Approach 1:
The patent achieves frequency range adaptability by implementing variable R and C parameters controlled by a control circuit. The time constant (RC) can be adjusted to match different signal frequency characteristics, allowing a single circuit structure to compensate for signals across broad frequency ranges without requiring multiple specialized circuits, thus managing complexity through parameter control rather than structural multiplication.
Data Source
AI summary
An adaptive equalizer device includes multiple equalizer circuits, multiple gain stage circuits, a digital offset correction circuit and an analog offset correction circuit. The equalizer circuits are coupled in series and compensate multiple input signals to generate multiple first output signals. The gain stage circuits are coupled in series and amplify the first output signals to generate multiple second output signals. The digital offset correction circuit adjusts DC levels of the first output signals according to the second output signals. The analog offset correction circuit adjusts multiple input levels of the last equalizer circuit of the equalizer circuits according to the second output signals, wherein the last equalizer circuit is configured to output the first output signals.