scholarly journals Amplitude modulator in class e with the current mirror in emitter circuits of the switching transistor

2008 ◽  
Vol 21 (2) ◽  
pp. 243-249
Author(s):  
Andjelija Raicevic
Keyword(s):  
Power Amplifier ◽  
Direct Current ◽  
Total Current ◽  
Current Mirror ◽  
Switching Transistor ◽  
Amplitude Modulator ◽  
Load Resistor ◽  
A Current ◽  
Class E

Starting from the fact that the amplitude of the basic harmonics of the current, flowing through load resistor of the class E power amplifier, is proportional to direct current flowing through the collector battery of the switching transistor, an introduction of a current mirror in emitter circuit of the transistor in whose reference branch is situated a generator of modulating voltage is proposed. It can be easily proven that the total current of this mirror, which is also the direct current of the collector battery, has the waveform of the amplitude modulated signal. This amplitude modulator is verified for performance with pSpace model. .

Design and Simulation of a Microcontroller Based Loudspeaker Protection System Against Amplifier Direct Current (D.C) Offsets

2016 ◽  
Vol 8 ◽  
pp. 12
Author(s):  
Abiodun Ogunseye ◽  
Olamide Omolara Olusanya
Keyword(s):  
Failure Mode ◽  
Power Amplifier ◽  
Direct Current ◽  
Failure Modes ◽  
Failure Mechanisms ◽  
Protection System ◽  
Amplifier Circuit ◽  
Switching Transistor ◽  
Detection Circuit ◽  
Critical Components

A number of failure mechanisms can result in the damage of loudspeakers that are directly connected to an audio power amplifier system. One of such failure modes occurs when the amplifier circuit develops an output d.c voltage, in which case, the loudspeaker coil will be damaged by overheating. D.c offset detection circuits, usually based on simple transistor circuits are normally used to protect the loudspeaker against this failure mode. However, as effective as they are, these circuits can fail in ways that can result in loudspeaker damage. In this work, a microcontroller based circuit that monitors the critical components of a loudspeaker d.c detection circuit, namely the switching transistor and the isolating relay circuit was developed. The hardware of the developed circuit was modelled with Proteus® software and its firmware was written using MikroC® software. The modelled circuit successfully detects the presence of d.c signals and also reports the states of the isolating relay and the switching transistors when these components fail.

A Current-Injection Class-E Power Amplifier

2020 ◽  
Vol 30 (8) ◽  
pp. 775-778 ◽  
Author(s):  
Jian-Chang Du ◽  
Zhi-Gong Wang ◽  
Jian Xu ◽  
Yi-Fan Yang
Keyword(s):  
Power Amplifier ◽  
Current Injection ◽  
A Current ◽  
Class E

A High Efficiency Class-E Power Amplifier Over a Wide Power Range Using a Look-Up Table Based Dynamic Biasing Scheme

2015 ◽  
Vol E98.C (4) ◽  
pp. 377-379
Author(s):  
Jonggyun LIM ◽  
Wonshil KANG ◽  
Kang-Yoon LEE ◽  
Hyunchul KU
Keyword(s):  
Power Amplifier ◽  
High Efficiency ◽  
Look Up Table ◽  
Dynamic Biasing ◽  
Class E

A 3.5 GHz hybrid CMOS class E power amplifier with reverse body bias design for 5G applications

2021 ◽  
Author(s):  
Ahmad Fariz Hasan ◽  
Sohiful Anuar Zainol Murad ◽  
Faizah Abu Bakar
Keyword(s):  
Power Amplifier ◽  
Hybrid Cmos ◽  
Class E ◽  
Body Bias

scholarly journals Design of the Class-E Power Amplifier with Finite DC Feed Inductance under Maximum-Rating Constraints

2021 ◽  
Vol 11 (9) ◽  
pp. 3727
Author(s):  
Ingrid Casallas ◽  
Carlos-Ivan Paez-Rueda ◽  
Gabriel Perilla ◽  
Manuel Pérez ◽  
Arturo Fajardo
Keyword(s):  
Quality Factor ◽  
Power Amplifier ◽  
Wide Spectrum ◽  
Circuit Simulation ◽  
Percentage Error ◽  
Resonant Circuit ◽  
Mean Square ◽  
Peak Voltage ◽  
Supply Current ◽  
Class E

This paper proposes an analytical expression set to determine the maximum values of currents and voltages in the Class-E Power Amplifier (PA) with Finite DC-Feed Inductance (FDI) under the following assumptions—ideal components (e.g., inductors and capacitors with infinite quality factor), a switch with zero rise and fall commutation times, zero on-resistance, and infinite off-resistance, and an infinite loaded quality factor of the output resonant circuit. The developed expressions are the average supply current, the RMS (Root Mean Square) current through the DC-feed inductance, the peak voltage and current in the switch, the RMS current through the switch, the peak voltages of the output resonant circuit, and the peak voltage and current in the PA load. These equations were obtained from the circuit analysis of this ideal amplifier and curve-fitting tools. Furthermore, the proposed expressions are a useful tool to estimate the maximum ratings of the amplifier components. The accuracy of the expressions was analyzed by the circuit simulation of twelve ideal amplifiers, which were designed to meet a wide spectrum of application scenarios. The resulting Mean Absolute Percentage Error (MAPE) of the maximum-rating constraints estimation was 2.64%.

Designing a Class E Power Amplifier through Modeling in Verilog-A

2020 ◽  
Author(s):  
Arriel Ting ◽  
Anastacia Alvarez ◽  
Maria Theresa De Leon ◽  
Marc Rosales ◽  
Maria Patricia Rouelli Sabino ◽  
...  
Keyword(s):  
Power Amplifier ◽  
Class E
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