研究目的
To reduce the circuit area of analog FIR filters used for distortion compensation in multi-level optical transmission by proposing a new multiplier configuration.
研究成果
The proposed analog FIR filter configuration achieves a 25% area reduction for 4-PAM signals compared to conventional methods, with effective distortion compensation shown through simulations. However, PVT variations and power consumption remain challenges, indicating areas for future improvement.
研究不足
The study relies on simulations without physical prototyping; PVT variations (especially slow corner) degrade performance; power consumption is not reduced; CMOS inverter delay limits maximum bit rate to 20 Gbps; further optimization is needed for higher multi-level signals and PVT compensation.
1：Experimental Design and Method Selection:
The study proposes a new analog FIR filter configuration using CMOS inverters as delay circuits and a modified Gilbert cell multiplier to reduce area for multi-level signals. SPICE simulations are used for estimation and evaluation.
2：Sample Selection and Data Sources:
Simulations are based on 28 nm FDSOI process technology, with input signals being 10 Gbps random signals for 4-PAM transmission.
3：List of Experimental Equipment and Materials:
CAD tools for simulation, SPICE simulator, 28 nm FDSOI MOSFETs, CMOS inverters, Gilbert cells, level shift circuits, resistors, and optical transmission components like multi-mode fiber.
4：Experimental Procedures and Operational Workflow:
Design the analog FIR filter with proposed multiplier, simulate using SPECTRE for circuit characteristics, evaluate area reduction, perform DC, transient, and noise analyses, and assess distortion compensation using eye patterns and EVM metrics.
5：Data Analysis Methods:
Analyze simulation results for area, power, linearity, noise, and performance metrics like EVM; compare with conventional methods.
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28 nm FDSOI MOSFET
28 nm FDSOI
STMicroelectronics
Semiconductor process technology used for designing the analog circuits in the study.
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CMOS Inverter
Used as a delay circuit in the analog FIR filter to introduce time delays for signal processing.
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Gilbert Cell
Serves as a multiplier in the analog FIR filter for signal multiplication and processing.
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Level Shift Circuit
Attenuates and shifts voltage levels of input signals to match the input range of the multiplier.
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Multi-Mode Fiber
Graded-Index (GI) Fiber
Used for optical signal transmission over 500 m in the system setup.
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Photo Diode
PD
Detects optical signals after transmission for direct detection in the receiver part.
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Attenuator
ATT
Adjusts optical power levels before detection by the photo diode.
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DFB Laser
Distributed Feedback Laser
Generates the optical carrier signal at 1550 nm for direct modulation in the transmission system.
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SPICE Simulator
Cadence
Used for circuit simulation and estimation of area reduction and performance metrics.
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