研究目的
To propose an optically lossless LED bandwidth extension technique based on the adoption of negative impedance converters for high capacity visible light communication systems.
研究成果
The paper demonstrates a lossless LED bandwidth extension technique by introducing negative capacitance in parallel with the LED diffusion capacitance using a specially designed negative impedance converter circuit. Significant bandwidth extension can be achieved while maintaining constant LED optical power.
研究不足
The technique's effectiveness is dependent on the quality of the negative capacitance generated by the NIC, which in turn depends on the bias currents of the transistors used in the NIC. Achieving pure negative capacitance is practically impossible, and the presence of negative resistance can affect the quality of the negative capacitance.
1：Experimental Design and Method Selection:
The study introduces a novel current inversion NIC circuit to synthesize negative capacitance, aiming to offset the LED diffusion capacitance.
2：Sample Selection and Data Sources:
Utilizes a verified LED equivalent model with characteristic values derived at 2 mA drive current.
3：List of Experimental Equipment and Materials:
Includes a BFR193 NPN silicon transistor for the NIC circuit and an LED with Cd =
4：59 nF, Rd = 4 ?, and Rs = 6 ?. Experimental Procedures and Operational Workflow:
Analyzes the LED impedance characteristics independently and when connected to the negative capacitance synthesized by the NIC.
5：Data Analysis Methods:
Examines the effect of compensating for the LED diffusion capacitance by exploiting NICs to generate negative capacitance in parallel with the LED.
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