CTLE Amplifier Circuit for Long-Distance High-Frequency Signals
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Solution Overview
Problem
Existing amplifier circuits fail to effectively amplify high-frequency signals over long distances, leading to signal attenuation and poor connection quality in communication systems.
Innovation Solution
An amplifier circuit comprising a continuous-time linear equalizer, adjustable gain circuit, and filter circuit, utilizing resistive and capacitive elements to amplify high-frequency signals, with a single operational amplifier for gain adjustment and second-order filtering, and an echo cancellation circuit to minimize echo impairments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional amplifier circuit is used for long-distance communication, then the communication distance can be extended, but the high-frequency signal attenuation increases and connection quality deteriorates
Solution Approach 1:
The amplifier circuit is segmented into multiple parallel paths (first high-pass path, first low-pass path, second high-pass path, second low-pass path), each handling different frequency components separately. This segmentation allows selective amplification of high-frequency signals while maintaining overall signal integrity over long distances.
Solution Approach 2:
Different paths are assigned different quality characteristics: high-pass paths use capacitive circuits with smaller areas optimized for high-frequency amplification, while low-pass paths use resistive circuits optimized for low-frequency signals. This local quality differentiation enables effective compensation of high-frequency attenuation without compromising low-frequency performance.
2Length of stationary object
If the communication distance is extended, then the coverage area increases, but the high-frequency signal attenuates faster and noise ratio decreases
Solution Approach 1:
The patent converts the harmful effect of high-frequency attenuation into a benefit by using capacitive circuits in high-pass paths that are specifically designed to amplify high-frequency components. The attenuation problem is transformed into an opportunity for selective high-frequency gain enhancement, improving signal quality despite long-distance transmission.
Solution Approach 2:
The circuit employs asymmetric design where high-pass paths use capacitive elements with smaller areas optimized for high-frequency response, while low-pass paths use resistive elements. This asymmetric configuration allows the circuit to differently treat high-frequency and low-frequency components, effectively compensating for high-frequency attenuation over distance.
3Device complexity
If a single operational amplifier is used, then device complexity and cost are reduced, but the ability to amplify high-frequency signals over long distances is limited
Solution Approach 1:
The single operational amplifier is designed to perform multiple functions simultaneously: it serves as the core amplifying element for all four paths (two high-pass and two low-pass paths), provides gain control, and enables second-order filtering through the configured resistor and capacitor networks. This multi-functionality reduces device complexity while maintaining high-frequency amplification capability.
Solution Approach 2:
The circuit uses variable resistive circuits that can dynamically adjust their resistance values to optimize performance for different communication distances and signal conditions. This dynamic adjustment allows the single operational amplifier to adaptively maintain high-frequency signal quality regardless of transmission distance variations.
Data Source
AI summary
An amplifier circuit includes a continuous-time linear equalizer, an adjustable gain circuit and a filter circuit. The continuous-time linear equalizer includes a first high-pass path, a first low-pass path, a second high-pass path, and a second low-pass path. The first high-pass path is used to increase a gain of a high-frequency part of a first signal source, and the second high-pass path is used to increase a gain of a high-frequency part of a second signal source. The filter circuit is used to amplify and filter the first signal source and the second signal source, and includes a fully-differential operational amplifier, a first filter network, and a second filter network.