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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.

Clipper Circuit

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).

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Passive Filters

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Related Experiment Video

Updated: May 31, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Demonstration of a mode-conversion cavity add-drop filter.

Marcel W Pruessner¹, Jacob B Khurgin, Todd H Stievater

¹Naval Research Laboratory (NRL), Washington, District of Columbia 20375, USA. marcelwp@ccs.nrl.navy.mil

|June 21, 2011

Summary

Researchers developed a novel integrated silicon-on-insulator add-drop filter using an asymmetric Y-branch and a shifted-grating cavity. This device enables efficient wavelength-selective mode conversion for optical signal processing.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Waveguide Devices

Background:

Add-drop filters are crucial components in optical communication networks for wavelength-selective signal routing.
Existing integrated solutions often face challenges in achieving high performance and miniaturization.
Mode-conversion techniques offer potential for novel filter designs.

Purpose of the Study:

To experimentally demonstrate a new type of integrated add-drop filter.
To leverage asymmetric Y-branch waveguides and shifted-grating cavities for optical filtering.
To achieve wavelength-selective mode conversion and add-drop functionality in a compact device.

Main Methods:

Fabrication of a three-port integrated silicon-on-insulator (SOI) device.
Incorporation of an asymmetric Y-branch waveguide coupler for mode separation.
Integration of a shifted-grating cavity for wavelength-selective mode conversion upon reflection.

Main Results:

Successful demonstration of add-drop functionality in the fabricated device.
Effective mode separation achieved using the asymmetric Y-branch.
Wavelength-selective mode conversion confirmed via reflection from the shifted-grating cavity.

Conclusions:

The proposed device architecture offers a novel approach for integrated optical filtering.
The combination of asymmetric Y-branch and shifted-grating cavity enables efficient add-drop operation.
This technology holds promise for advanced optical signal processing and communication systems.