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Related Concept Videos

Design Example01:23

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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...
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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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Cruise control systems in cars are designed as multi-input systems to maintain a driver's desired speed while compensating for external disturbances such as changes in terrain. The block diagram for a cruise control system typically includes two main inputs: the desired speed set by the driver and any external disturbances, such as the incline of the road. By adjusting the engine throttle, the system maintains the vehicle's speed as close to the desired value as possible.
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Design Example: Capacitance Multiplier Circuit01:20

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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.
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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Updated: Aug 30, 2025

Quasi-light Storage for Optical Data Packets
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Digital Keying Enabled by Reconfigurable 2D Modulators.

Sarbashis Das1, Saptarshi Das1,2,3,4

  • 1Electrical Engineering, Pennsylvania State University, University Park, PA, 16802, USA.

Advanced Materials (Deerfield Beach, Fla.)
|September 3, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a reconfigurable modulator using MoTe2 transistors for energy-efficient Internet-of-Things (IoT) communication. It enables amplitude, frequency, and phase shift keying (ASK/FSK/PSK) and enhances bandwidth efficiency with multibit modulation.

Keywords:
MoTe 2 field-effect transistorsambipolar transportdigital modulatorsdouble-well characteristics

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Telecommunications

Background:

  • Internet-of-Things (IoT) edge communication requires energy, area, and bandwidth efficient primitives.
  • Silicon-based complementary metal-oxide-semiconductor (CMOS) technology dominates IoT communication but faces hardware footprint and energy consumption challenges.
  • Current CMOS technology requires separate designs for different keying schemes (ASK, FSK, PSK) and struggles with multibit modulation for bandwidth efficiency.

Purpose of the Study:

  • To introduce a novel reconfigurable modulator for IoT edge communication.
  • To overcome the limitations of CMOS technology in terms of energy, area, and flexibility.
  • To demonstrate multibit data modulation for improved bandwidth efficiency.

Main Methods:

  • Utilized ultrathin MoTe2 field-effect transistors (FETs) exploiting ambipolar transport and programmable Dirac voltage.
  • Implemented a reconfigurable modulator capable of ASK, FSK, and PSK modulation.
  • Integrated two programmed MoTe2 FETs to achieve multibit data modulation and realized a frequency quadrupler.

Main Results:

  • Achieved ASK, FSK, and PSK modulation using a single reconfigurable MoTe2 FET modulator.
  • Demonstrated multibit data modulation by integrating two MoTe2 FETs, improving bandwidth efficiency by 200%.
  • Successfully realized a frequency quadrupler leveraging the unique "double-well" transfer characteristic of MoTe2 FETs.

Conclusions:

  • The developed MoTe2 FET-based reconfigurable modulator offers a promising solution for energy, area, and bandwidth efficient IoT communication.
  • This approach overcomes the limitations of traditional CMOS technology for resource-constrained IoT devices.
  • The demonstrated multibit modulation and frequency quadrupling capabilities pave the way for advanced IoT communication systems.