Tudor Petrescu

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—This paper deals with analog-to-digital (A/D) conversion for future software/cognitive radio systems. For these applications, A/D converters should convert wide-band signals and offer high resolutions. In order to achieve this and to overcome technological limitations, the A/D conversion systems should be versatile, i.e. it should be possible to adapt the(More)
This paper studies the sensitivity of hybrid filter banks (HFB) to analog inaccuracies and finite word implementation. It is shown that very small errors affecting very simple analog structures have a dramatic influence on the performances of the HFB. The influence of the quantization of digital filter coefficients is also studied. A theoretical limit for(More)
This paper presents two methods of designing hybrid filter banks (HFB), taking into account analog filter constraints resulting from the need of having very simple analog structures. Therefore, standard resonators are considered for the analog analysis filters. They are seen as input data of the design process and are kept unmodified throughout the design(More)
Dual-mode, meander loop filters can provide a valid solution for narrow-band, compact and cost-effective devices for mobile communications. The finite-difference time-domain (FDTD) method was employed in order to obtain an accurate filter design. For the non-reflective boundary conditions, the Bérenger perfectly-matched layer (PML) was extended to a 3-D(More)
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