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MOSFET Amplifiers01:17

MOSFET Amplifiers

219
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...
219
Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

727
In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
727
BJT Amplifiers01:14

BJT Amplifiers

589
Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
In BJT amplifier configurations, particularly in common-emitter setups, the transistor's role...
589

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Quantum Thermal Amplifiers with Engineered Dissipation.

Antonio Mandarino1

  • 1International Centre for Theory of Quantum Technologies (ICTQT), University of Gdansk, 80-309 Gdansk, Poland.

Entropy (Basel, Switzerland)
|July 27, 2022
PubMed
Summary

Researchers explored quantum thermal transistors using three qubits and thermal baths. They analyzed how different thermal noises and correlations impact current amplification, offering insights into device engineering.

Keywords:
multiparticle correlationsphononicsquantum thermal transistor

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Condensed matter physics

Background:

  • A quantum thermal transistor is a three-terminal device controlling heat currents.
  • Previous research focused on engineering system configurations.
  • Implementing such a device with a three-qubit system interacting with thermal baths is a key area.

Purpose of the Study:

  • To investigate the role of distinct dissipative thermal noises in a quantum thermal transistor.
  • To engineer thermal reservoirs for magnifying current amplification.
  • To analyze the impact of correlations on the thermal transistor effect.

Main Methods:

  • Derivation of a quantum dynamical equation for system evolution.
  • Implementation of a three-qubit system interacting with three separate thermal baths.
  • Utilizing quantum information theory measures to analyze correlations.

Main Results:

  • Comparison of amplification gain across different configurations.
  • Identification of the influence of specific thermal noises on transistor performance.
  • Demonstration of the role of quantum correlations in enhancing the thermal transistor effect.

Conclusions:

  • Distinct thermal noises significantly affect quantum thermal transistor amplification.
  • Quantum correlations play a crucial role in magnifying current amplification.
  • The study provides a framework for engineering quantum thermal devices with enhanced performance.