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BJT Amplifiers

BJT Amplifiers

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 extends...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

Small-Signal Analysis of BJT Amplifiers

Small-Signal Analysis of BJT Amplifiers

Small signal analysis is a fundamental approach used in electronics to understand how a Bipolar Junction Transistor (BJT) amplifier processes signals. In the active region, the BJT is designed for linear amplification. The transistor's behavior under these conditions is governed by its instantaneous base-emitter voltage VBE, a sum of the DC bias VBE, and a small AC signal VBE, resulting in the collector current iC. Here, the collector current has a DC component and an AC component.

Small-Signal Analysis of MOSFET Amplifiers

Small-Signal Analysis of MOSFET Amplifiers

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...

MOSFET Amplifiers

MOSFET Amplifiers

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...

Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

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Related Experiment Video

Updated: May 15, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Beam shaping in spatially modulated broad-area semiconductor amplifiers.

R Herrero¹, M Botey, M Radziunas

¹Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Colom 11, Terrassa 08222, Spain. ramon.herrero@upc.edu

|December 22, 2012

Summary

We developed a beam-shaping method for semiconductor amplifiers using spatial pump modulation. This technique significantly improves beam quality by filtering radiation angles during amplification.

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Beam Propagation

Background:

Broad-area semiconductor amplifiers often suffer from poor beam quality.
Spatial pump modulation is a potential technique to control beam characteristics.

Purpose of the Study:

To propose and analyze a novel beam-shaping mechanism for broad-area semiconductor amplifiers.
To investigate the impact of micrometer-scale spatial pump modulation on beam quality.
To predict and quantify the spatial filtering performance.

Main Methods:

Numerical integration of the paraxial propagation model.
Analytical estimations of spatial filtering performance.
Analysis under realistic operating parameters and conditions.

Main Results:

A spatial (angular) filtering of amplified radiation is predicted.
Substantial improvement in the spatial quality of the output beam.
Quantitative performance analysis of the proposed mechanism.

Conclusions:

Spatial pump modulation on a micrometer scale offers an effective beam-shaping mechanism.
The proposed method significantly enhances beam quality in broad-area semiconductor amplifiers.
This technique provides a viable solution for improving laser beam characteristics.