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01:20Design Example: Capacitance Multiplier Circuit
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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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01:17Ampere-Maxwell's Law: Problem-Solving
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A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of...
To solve the problem, we can use the equations from the analysis of an RC circuit and Maxwell's version of Ampère's law.
For the first part of...
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Reconfigurable parallel photonic matrix-vector multiplication processor based on multi-dimensional multiplexing.
Optics Express
|June 14, 2025
Summary
This study introduces a novel reconfigurable parallel matrix-vector multiplication (MVM) processor using WDM and DSM technologies. The new photonic MVM architecture significantly enhances parallelism and flexibility for demanding computational tasks.
Area of Science:
- Photonics
- Optical Computing
- Signal Processing
Background:
- Matrix-vector multiplication (MVM) is crucial for data processing and artificial neural networks.
- Existing photonic MVM architectures face limitations in parallelism and flexibility.
- Growing demand for computing power necessitates advanced MVM solutions.
Purpose of the Study:
- To propose a novel reconfigurable parallel MVM (RP-MVM) processor architecture.
- To enhance the parallelism and flexibility of photonic MVM systems.
- To demonstrate the feasibility of the RP-MVM for high-performance computing tasks.
Main Methods:
- Incorporation of wavelength division multiplexing (WDM) and digital subcarrier multiplexing (DSM) into a photonic MVM architecture.
- Development of a reconfigurable parallel MVM (RP-MVM) scheme.
- Dynamic adjustment of input data channels without altering hardware scale.
Main Results:
- The RP-MVM scheme increases parallelism by N times compared to traditional WDM-MVM.
- Achieved parallel computing of eight MVMs with a speed of 128 GOPs.
- Demonstrated a root mean square error (RMSE) of 1E-3 for 6-bit data and parallel processing of four grayscale images for edge extraction.
Conclusions:
- The proposed RP-MVM processor offers a significant advancement in photonic computing.
- The architecture provides a highly parallel and reconfigurable solution for large-scale MVM.
- This scheme presents a viable alternative for future high-performance optical computing systems.