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Design Example: Capacitance Multiplier Circuit

Design Example: Capacitance Multiplier Circuit

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.

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Updated: Feb 19, 2026

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

A Code Division Design Strategy for Multiplexing Fiber Bragg Grating Sensing Networks.

Andrés Triana^1,2, Daniel Pastor³, Margarita Varón⁴

¹Photonics Research Labs (PRL), Universitat Politècnica de València, 46022 Valencia, Spain. catrianai@unal.edu.co.

Sensors (Basel, Switzerland)

|November 7, 2017

Summary

This summary is machine-generated.

This study introduces an encoding strategy for fiber Bragg grating (FBG) sensors, enabling unique identification even with overlapping spectra. This method significantly enhances the capacity of FBG sensing systems.

Keywords:

FBG encoding fiber Bragg grating optical fiber sensor overlap proof sensing network

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Last Updated: Feb 19, 2026

Writing Bragg Gratings in Multicore Fibers

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Published on: April 20, 2016

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Area of Science:

Photonics
Optical Sensing
Materials Science

Background:

Fiber Bragg Grating (FBG) sensors are widely used for various measurements.
Current multiplexing techniques for FBG sensors face limitations in system capacity.
Spectral overlapping of FBG sensors is a significant challenge in dense sensor networks.

Purpose of the Study:

To develop a novel encoding strategy for FBG sensors to increase multiplexing capacity.
To demonstrate a method for uniquely identifying multiple FBG sensors under spectral overlapping.
To enhance the number of sensors handleable within a single optical channel.

Main Methods:

An encoding strategy using two binary codewords for amplitude and phase patterns was designed.
Specialized FBG sensors were manufactured based on the developed encoding strategy.
A theoretical framework and experimental setup for interrogating the central wavelengths of encoded FBG sensors were developed.

Main Results:

A proof-of-concept with three uniquely identifiable FBG sensors under spectral overlapping was successfully demonstrated.
The proposed method achieved a three-time improvement in system capacity, effectively increasing the number of multiplexed sensors.
The assessment of overlapping errors indicated a high precision of approximately 3 pm, suitable for practical applications.

Conclusions:

The developed encoding strategy significantly enhances the multiplexing capability of FBG sensors.
The unique amplitude and phase patterns allow for reliable identification of sensors even with overlapping spectra.
This approach offers a practical and effective solution for increasing sensor density in FBG-based measurement systems.