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Related Concept Videos

Passive Filters01:27

Passive Filters

1.3K
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

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Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Cut-off Frequency of BJT01:17

Cut-off Frequency of BJT

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Cut-off frequencies in Bipolar Junction Transistors (BJTs) mark the transition between the signal's pass band and stop band, influencing their performance in amplifying or attenuating frequencies. These frequencies are crucial for designing BJTs to meet specific operational requirements in electronic circuits.
Alpha Cut-Off Frequency: Pertinent to the common-base configuration, the alpha cut-off frequency defines the upper-frequency limit at which the current gain, alpha, remains stable. As...
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Op Amp AC Circuits01:18

Op Amp AC Circuits

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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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PN-type carrier-induced filter with modulatable extinction ratio.

Qing Fang, Xiaoguang Tu, Junfeng Song

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    |January 22, 2015
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    Summary

    Researchers developed a novel silicon waveguide Bragg grating filter using PN-type carrier modulation. This device offers efficient optical extinction ratio modulation under electrical bias, enabling tunable optical filtering on a chip.

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    Area of Science:

    • Photonics and Optoelectronics
    • Semiconductor Devices
    • Integrated Optics

    Background:

    • Silicon photonics is crucial for integrated optical circuits.
    • Bragg gratings are fundamental components for wavelength-selective filtering.
    • Modulating optical properties via electrical means is key for tunable devices.

    Purpose of the Study:

    • To demonstrate the first PN-type carrier-induced silicon waveguide Bragg grating filter.
    • To investigate the modulation capabilities of the optical extinction ratio under electrical bias.
    • To characterize the performance metrics including bandwidth, extinction ratio, and modulation speed.

    Main Methods:

    • Fabrication of a PN junction-based carrier-induced Bragg grating on a silicon waveguide using litho compensation technology.
    • Characterization of optical properties including extinction ratio, bandwidth, and transmission loss under varying electrical biases (forward and reverse).
    • Measurement of central wavelength shifting rates and 3-dB modulation bandwidth.

    Main Results:

    • Achieved an optical bandwidth of 0.45 nm and a maximum extinction ratio of 19 dB.
    • Demonstrated efficient extinction ratio modulation (>11.5 dB under reverse bias, >10 dB under forward bias) with low optical transmission loss (1 dB under reverse bias).
    • Measured central wavelength shifting rates of ~-1.25 nm/V (forward) and 0.01 nm/V (reverse), and a 3-dB modulation bandwidth of 5.1 GHz at -10 V bias.

    Conclusions:

    • The developed PN-type carrier-induced silicon waveguide Bragg grating filter is the first of its kind.
    • The filter exhibits efficient and tunable optical modulation capabilities, suitable for integrated photonic applications.
    • The device shows promising performance for high-speed optical signal processing and wavelength tuning.