On Optimization of Manufacturing of Power Amplifier Circuit Based on Bipolar Heterostructures to Increase Density of Their Elements. Influence of Miss-Match Induced Stress

2017 ◽  
Vol 9 (10) ◽  
pp. 849-863 ◽  
Author(s):  
E. L. Pankratov
Keyword(s):  
Power Amplifier ◽  
Amplifier Circuit ◽  
Induced Stress

The Design and Simulation Analysis of Current Amplifier Circuit of Relay Test

2012 ◽  
Vol 466-467 ◽  
pp. 966-970
Author(s):  
Bai Fen Liu ◽  
Xian Wu Fang ◽  
Yun Chen
Keyword(s):  
Theoretical Calculation ◽  
Output Power ◽  
Power Amplifier ◽  
Simulation Analysis ◽  
Amplifier Circuit ◽  
Current Amplifier ◽  
Reliable Design

This article proposes a practical and reliable design applicable to DC output power amplifier circuit of relay tester. Through theoretical calculation, the author discuss the amplifier circuit can meet the requirement of relay tester to output, and supply the design and simulation analysis of power amplifier circuit, and expatiate the functions of each module of the circuit. The simulation analysis proves that this circuit is a efficient, stable and feasible conversion circuit which can amply energy.

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.

Design of Excitation Source for Ultrasonic Guided Waves Based on DDS Technology

2014 ◽  
Vol 1049-1050 ◽  
pp. 674-677 ◽  
Author(s):  
Fen Ping Zhou ◽  
Yang Jiao ◽  
Hui Juan Duan
Keyword(s):  
Power Amplifier ◽  
Guided Waves ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Excitation Source ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Amplifier Circuit ◽  
Ultrasonic Guided Wave ◽  
Low Pass

According to the characteristics of ultrasonic guided wave inspection, An exciting power, used for exciting ultrasonic guided waves in pipeline is designed based on DDS and FPGA. The excitation source consists of FPGA, D/A conversion circuit, a low-pass filter circuit and power amplifier circuit. Constructing DDS based on FPGA as the controller and signal generator. Filter circuit and power amplifier circuit are designed in this paper. The experiment results show that the excitation source can have high voltage and high frequency output capability, and can generate desired signal type with a good accuracy to fit the requirements in practice. It can be conveniently used for pipeline ultrasonic guided wave detection.

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