Agenda

PhD thesis defence

Monday, 4 January 2021
14:30-16:00
Online

Out-of-band Interference Immunity of Negative-Feedback Amplifiers

Emil Totev

Out-of-band interference is caused by the non-linear behaviour of the components in amplifier circuits, as detailed in Chapter 1. To address that, it is necessary to develop amplifiers with a low IP2 figure, i.e., apply linearisation.

Chapter 2 gives an overview of the existing linearisation techniques and other methods to reduce the effect of non-linear behaviour. A mathematical analysis of a generic negative-feedback amplifier is conducted in Chapter 3 using the Volterra series. As this method often involves complex, cumbersome calculations, a simplified approach is introduced in Chapter 4. Using both the classical and the simplified non-linear analysis tools, a number of new design methods for out-of-band interference immunity enhancement are developed in Chapter 5. These make use of frequency-dependent local feedback, pole position manipulation and non-linear local-feedback compensation. Finally, a design example of non-linear local-feedback compensation in a negative-feedback amplifier is presented in Chapter 6.

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