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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

Design 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.
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Inverting and Non-inverting OpAmps01:20

Inverting and Non-inverting OpAmps

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In an inverting amplifier, the input voltage is connected through a resistor to the inverting terminal. Meanwhile, the non-inverting terminal is grounded and a feedback resistor is established between the inverting and output terminal, as depicted in Figure 1.
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Integrator and Differentiator01:13

Integrator and Differentiator

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Op-amp circuits have significant applications in various fields, including automotive engineering. One such application is cruise control systems in cars, where op-amp circuits are integral for maintaining a constant speed. In these systems, op-amps function as both integrators and differentiators.
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Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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Related Experiment Video

Updated: Jun 5, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Tunable on-chip mode converter enabled by inverse design.

Hongyin Zhou1, Kun Liao2, Zhaoxian Su1

  • 1Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

We developed a tunable mode converter for optical communication, enabling high-order mode conversion. This liquid crystal device offers dynamic channel switching with low loss and efficient multifunction design.

Keywords:
integrated photonicsinverse designmode-division multiplexingnanophotonics

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science for Optoelectronics

Background:

  • Mode-division multiplexing (MDM) is crucial for optical communication channel switching and routing.
  • Existing mode converters struggle with simultaneous high-order mode conversion and dynamic tunability.

Purpose of the Study:

  • To design a tunable mode converter capable of converting fundamental mode to multiple high-order modes (TE0, TE1, TE2).
  • To achieve high performance with low intrinsic loss and dynamic tunability.

Main Methods:

  • Utilized an inverse design framework based on the adjoint method for optimizing the mode converter.
  • Fabricated a liquid crystal-filled tunable mode converter and a mode demultiplexer for experimental validation.

Main Results:

  • The designed tunable mode converter demonstrated efficient conversion to multiple high-order modes.
  • Experimental results showed good agreement with simulations, achieving low crosstalk (around -7 dB).
  • The device enabled dynamic routing functionalities.

Conclusions:

  • The proposed inverse design framework is effective for creating multifunction optical devices.
  • The liquid crystal-based tunable mode converter offers a promising solution for advanced optical communication systems.