ON THE DESIGN OF PASSIVE DISPERSIVE FILTERS FOR ANALOG SIGNAL PROCESSING APPLICATIONS

Hanane Meliani, Emilie Avignon-Meseldzija, Jelena Anastasov, Dejan Milic, Pietro Maris Ferreira

DOI Number
https://doi.org/10.2298/FUEE2404639M
First page
639
Last page
654

Abstract


The paper presents the design of two dispersive filters (also called phasers) dedicated to Analog Signal Processing (ASP) applications. Possible ASP applications targeted for these filters are also proposed: analog pulse compression radar, analog chirp Fourier transformer and frequency discriminator. In the past decades, dispersive filters for ASP have been implemented with Surface Acoustic Wave (SAW) filters, having a reduced bandwidth leading to a poor resolution in the applications. Consequently, designing these filters with a larger bandwidth is a significant progress and this is what is proposed in this work. The design of the two filters is described step-by-step: the mathematical method employed to optimize the parameters of the filters, the calculation of theoretical values of components and the selected real values of components of the shelves for the PCB. The two measured filters, composed of 2 passive cells, have negative slope and positive slope group delay characteristics: the first filter has a group delay downslope of -1 ns/GHz for the considered bandwidth [700MHz – 1.9GHz], and the second has a group delay upslope of 1.25ns/GHz for the considered bandwidth [500MHz-1.3GHz]

 


Keywords

dispersive filter, phasers, analog signal processing, group delay, analog chirp Fourier transformer, Frequency discriminator

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References


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