An FM Chirp Waveform Generator and Detector for Radar

Baseband, intermediate frequency, low noise and RF power amplifiers

Bachelor thesis (2020)

Authors

A. Sabti Electrical Engineering, Mathematics and Computer Science
L.S. Bouman Electrical Engineering, Mathematics and Computer Science

Contributors

S.M. Alavi Electronics - EEMCS (supervisor 1)
M. Babaie Electronics - EEMCS (supervisor 1)
Faculty
Electrical Engineering, Mathematics and Computer Science
Copyright: © 2020 Abbas Sabti, Lars Bouman
Intermediate frequency amplifier FM chirp tranceiver Amplifier Low noise amplifier Power Amplifiers Class E power amplifier
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Published Date

29-06-2020

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

This report describes the design of different amplifiers that are part of an FM transceiver. This is part of a larger project, which has the objective to design a complete FM transceiver from discrete components only, meaning that IC technology is not considered.
The circuits designed are two baseband amplifiers, an intermediate frequency amplifier, a low noise amplifier and an RF power amplifier. The baseband amplifiers are implemented with a Darlington pair in common-collector configuration to achieve a high input resistance, low output resistance, and unity gain transfer.
The intermediate frequency amplifier is centered at 9.95 MHz with a -3dB bandwidth of 2 MHz. The maximum gain is 40.5 dB and can be lowered with up to 39.7 dB using a potentiometer, based on the emitter degeneration principle.
The low noise amplifier has a maximum noise figure of 1.4 dB over the RF carrier band of 88 to 108 MHz. It has a gain of 33 dB, and reaches its 1 dB compression point for an input of -33 dBm. The total harmonic distortion is less than 0.3%.
A class E power amplifier is designed with an efficiency of 72.9%, a transmit power of 3.1 W, and a gain of 31.8 dB.
Furthermore, this reports also presents a systematic design approach for amplifiers, which illustrate the core principles on which all the designs are based.