Light Emitting Element Drive Circuit Frequency Band Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting element drive circuits fail to effectively reduce time-directional fluctuations in the output waveform of light emitting elements, particularly in high frequency regions, despite using pre-emphasis techniques.
Innovation Solution
A light emitting element drive circuit with multiple signal paths, each equipped with filters, amplifiers, and delay circuits arranged based on frequency bands, where high-pass filters and amplifiers are used in high-frequency paths to increase group delay and intensity, and low-pass filters and delay circuits are used in low-frequency paths to further enhance signal characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pre-emphasis technique is used to intensify high frequency components, then the amplitude of received signal is increased, but time-directional fluctuations in output waveform are not reduced
Solution Approach 1:
The signal path is divided into multiple frequency bands (low frequency band and high frequency band) with separate processing paths. Each band is processed independently with dedicated filters, delay circuits, and amplifiers, allowing optimized control of time-directional fluctuations for each frequency range while maintaining overall signal amplitude.
Solution Approach 2:
Different processing characteristics are applied to different frequency bands. Low frequency components receive different delay and amplification treatment compared to high frequency components, enabling localized optimization of waveform stability for each frequency range rather than uniform processing.
2Stability of the object's composition
If delay circuit is arranged in low frequency band path, then group delay is increased and time-directional fluctuations are reduced, but device complexity increases
Solution Approach 1:
The delay circuit functionality is segmented and distributed across different frequency paths rather than using a single complex delay circuit for the entire bandwidth. This allows simpler delay implementations in each frequency band while achieving overall waveform stabilization.
Solution Approach 2:
Frequency selective filters serve as intermediaries that separate the signal into different frequency bands before processing. This allows independent optimization of each band with simpler circuits while the filters mediate the overall signal flow and coordination between paths.
Data Source
AI summary
A light emitting element drive circuit includes: a plurality of signal paths that respectively propagate a plurality of signals obtained by branching an input signal, a plurality of filters different in a frequency band to pass a signal; one or more amplifiers configured to amplify a signal, one or more delay circuits configured to delay a signal, and an addition circuit that adds a plurality of signals, the filter different in the frequency band being arranged in each of the plurality of signal paths, the delay circuit being arranged in one or more of the plurality of signal paths relatively low in the frequency band, the amplifier being arranged in one or more of the plurality of signal paths relatively high in the frequency band, and an output end of each of the plurality of signal paths being coupled to the addition circuit.