Processing Circuit for Signal Correction
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Solution Overview
Problem
LSI analog equalizers face issues with increased crosstalk and circuit complexity due to the inability of directional couplers to effectively correct frequency characteristics, leading to larger circuit scales.
Innovation Solution
A processing circuit comprising a transmission circuit with first attenuation characteristics and a correction circuit with inverse characteristics, both mounted on a printed board, which attenuate and correct high-frequency signals to flatten frequency amplitude characteristics, reducing crosstalk and circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an LSI analog equalizer is used to correct frequency characteristics, then the frequency amplitude characteristics can be flattened, but the circuit scale increases and crosstalk noise increases
Solution Approach 1:
The equalizer function is segmented into two separate circuits: a transmission circuit with first attenuation characteristics and a correction circuit with second attenuation characteristics. This segmentation allows each circuit to have simpler design requirements, reducing the overall circuit scale while achieving the desired frequency correction effect.
Solution Approach 2:
An intermediary signal (attenuation signal) is introduced between the transmission circuit and correction circuit. This intermediary allows the system to achieve frequency correction through a distributed approach rather than requiring a single complex equalizer, thereby reducing circuit complexity and crosstalk.
2Manufacturing precision
If an LSI analog equalizer is used to correct frequency characteristics, then the frequency amplitude characteristics can be flattened, but crosstalk noise increases
Solution Approach 1:
By dividing the equalization function into two separate circuits with different attenuation characteristics, the signal path is distributed, which reduces the crosstalk noise that would be generated in a single complex equalizer circuit.
Solution Approach 2:
The invention uses a simplified correction circuit that copies only the essential frequency correction function without the full complexity of a traditional equalizer, thereby reducing crosstalk while maintaining the necessary frequency characteristics.
3Device complexity
If a directional coupler is used in the transmission channel, then the circuit configuration can be simplified, but the frequency characteristics cannot be corrected effectively
Solution Approach 1:
The invention merges the transmission function and correction function into a unified two-circuit system where the transmission circuit and correction circuit work together. This combination achieves both circuit simplicity and effective frequency correction, overcoming the limitations of using a directional coupler alone.
Solution Approach 2:
The invention changes the attenuation characteristics parameters of the two circuits to achieve the desired frequency correction. By carefully designing the first and second attenuation characteristics, the system achieves effective frequency characteristic correction while maintaining a simple circuit configuration.
Data Source
AI summary
A transmission circuit, mounted on a printed board and having attenuation characteristics, to attenuate an amplitude of a reception signal according to the attenuation characteristics, and to transmit the amplitude-attenuated reception signal, as an attenuation signal; and a correction circuit, mounted on the printed board and having correction characteristics, to attenuate an attenuation signal that has been received from the transmission circuit according to the correction characteristics, and to transmit the attenuation signal attenuated, as a correction signal are provided. The attenuation characteristics are such characteristics that the ratio of the amplitude of the attenuation signal to the amplitude of the reception signal decreases as the frequency of the reception signal increases. The correction characteristics are characteristics with which the ratio of the amplitude of the correction signal to the amplitude of the attenuation signal increases as the frequency of the attenuation signal increases.