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Related Concept Videos

Passive Filters01:27

Passive Filters

615
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...
615
Design Example01:23

Design Example

375
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
375
Active Filters01:25

Active Filters

937
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:
937
Biasing of FET01:22

Biasing of FET

374
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.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
374
Switching of BJT01:22

Switching of BJT

506
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
506
MOSFET Amplifiers01:17

MOSFET Amplifiers

226
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
226

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Updated: Sep 20, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

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VOx-Based Non-Volatile Radio-Frequency Switches for Reconfigurable Filter.

Dabin Seo1, Dahyeon Kim2, Jiyeon Ryu1

  • 1Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, South Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 28, 2025
PubMed
Summary
This summary is machine-generated.

Vanadium oxide memristors with gold and silver electrodes show high performance for radio-frequency switches. These devices enable advanced, agile communication systems with tunable filters.

Keywords:
5G/6G communicationnon‐volatile memoryradio‐frequency switchreconfigurable filtervanadium oxide

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Vanadium oxide (VOx) memristors are suitable for non-volatile memory and radio-frequency (RF) switches.
  • Integration with wafer-level processes and high-frequency operation are key advantages.

Purpose of the Study:

  • To demonstrate high-performance VOx memristors using gold and silver electrodes.
  • To evaluate their potential for advanced RF switches and reconfigurable filters.

Main Methods:

  • Fabrication of VOx memristors with gold (Au) and silver (Ag) electrodes.
  • Characterization of device performance, including retention, endurance, and switching speed.
  • Integration of memristors into RF switches and a reconfigurable bandpass filter.

Main Results:

  • Achieved higher cutoff frequencies compared to previous VOx devices.
  • Demonstrated RF switches with a cutoff frequency of ~4.5 THz, low insertion loss (<0.46 dB), and high isolation (>20 dB) up to 67 GHz.
  • Developed a reconfigurable X-band bandpass filter with a tunable range of ~600 MHz.

Conclusions:

  • High-performance VOx memristors are viable for next-generation RF applications.
  • These devices enable compact and versatile RF front-ends with enhanced frequency agility.
  • The demonstrated reconfigurable filter showcases the potential for advanced communication systems.