Analysis and simulation of third order intermodulation products in class AB RF power amplifiers

Abstract

Broad band high power amplifiers capable of handling multiple input frequencies simultaneously with low spurious output are used in many areas of communications, especially Electronic Warfare jamming transmitters. High , .efficiency is extremely important in many applications because of limited power supply. Class AB RF power amplifiers have good inherent efficiency but typically have high spurious outputs .· ,hen driven with multiple frequency inputs which can cause unwanted interference with friendly communications. In class AB amplifiers, reducing the output power level does not reduce the spurious levels as it does in class A amplifiers. The amplifier bias must be increased to reduce the spurious levels. A method for predicting the spurious output levels versus the bias is needed to optimize the efficiency versus the output spurious levels.

This thesis analyzes the spurious levels caused by the crossover jistortion and develops a mathematical model of the transfer function based on the voltage-current curves of the active devices. A two signal input is operated on by the transfer function to provide a predicted time domain output waveform. The Fast Fourier Transform of this output predicts the spurious output levels versus the bias conditions.

Notes

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Graduation Date

1992

Semester

Fall

Advisor

Belkerdid, Madjid A.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Electrical Engineering

Degree Program

Electrical Engineering

Format

PDF

Pages

46 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0029754

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

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