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Small-Signal Analysis of MOSFET Amplifiers01:23

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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...
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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
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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...
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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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Testing and Analysis of MOSFET-Based Absorber Integrated Antenna for 5G/WiMAX/WLAN Applications.

Elliot O Omoru1, Viranjay M Srivastava1

  • 1Department of Electronic Engineering, Howard College, University of KwaZulu-Natal, Durban 4041, South Africa.

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This study presents a novel MOSFET-based absorber active integrated antenna that resolves power amplifier (PA) performance issues caused by impedance mismatch. The design efficiently absorbs reflected radio frequency power, enhancing overall system performance.

Keywords:
MOSFETabsorberantennacirculatormicroelectronicspulse generatorsolid-state electronics

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Area of Science:

  • Electromagnetics and Antenna Design
  • Radio Frequency (RF) Engineering
  • Semiconductor Device Applications

Background:

  • Power amplifier (PA) performance degrades due to antenna and PA impedance mismatch.
  • Reflected radio frequency (RF) power from impedance mismatch negatively impacts system efficiency.
  • Existing solutions often lack full integration and efficient absorption of reflected RF power.

Purpose of the Study:

  • To design and analyze a 3D electromagnetic circuit for a MOSFET-based absorber active integrated antenna.
  • To address performance degradation in PAs caused by antenna and PA impedance mismatch.
  • To develop a fully integrated solution for absorbing reflected RF power.

Main Methods:

  • 3D electromagnetic circuit design and analysis.
  • Integration of a dual-band double material substrate (DMS) cylindrical surrounding patch antenna (CSPA) with a MOSFET-based absorber.
  • Incorporation of a diode-based quasi-circulator for reflected RF power absorption.

Main Results:

  • The integrated antenna operates at dual bands: 2-3 GHz (1 GHz bandwidth) and 4.6-6.1 GHz (1.5 GHz bandwidth).
  • The MOSFET absorber condition (I ≤ I and V = 0) was satisfied at both resonance frequencies.
  • An antenna radiation efficiency of 84% was achieved.

Conclusions:

  • The proposed MOSFET-based absorber active integrated antenna effectively mitigates PA performance degradation due to impedance mismatch.
  • The design is suitable for lower and upper bands of WLAN/WiMAX RF front-end applications.
  • This integrated solution offers efficient absorption of reflected RF power and high radiation efficiency.