Macquarie University
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Direct down conversion receivers and intermodulation balance

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posted on 2022-03-29, 00:38 authored by Ryan Clement
Direct down converting receiver architecture is reviewed. The impetus for moving towards this architecture is driven by cost, however it does have some design drawbacks. Volterra analysis is used to show how coefficients often neglected in heterodyne radios can play a significant part in the overall performance of a radio, although careful review of any spurious tones should be analysed before switching to this design topology. Measurements are taken with different devices from two process technologies - Gallium Arsenide (GaAs) and Silicon Germanium (SiGe) with differing results. Overall the GaAs devices are more linear, however the second order performance is significantly better with SiGe and it is thought that this could be attributed to balance.


Table of Contents

1. Abstract -- 2. Introduction -- 3. Intermodulation within downconverters -- 4. Intermodulation with respect to amplifiers -- 5. Intermodulation with respect to balanced amplifiers and mixers -- 6. Measurement in practice -- 7. Conclusion.


Bibliography: pages 43-44 Empirical thesis.

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Engineering

Department, Centre or School

Department of Engineering

Year of Award


Principal Supervisor

Anthony Parker


Copyright Ryan Clement 2016. Copyright disclaimer:




1 online resource (44 pages) colour illustrations

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