A wideband CMOS variable gain low noise amplifier suitable for multi-standard radio applications between 75 MHz and 3 GHz is presented. Wideband matching to 50 Ohm (single ended) is achieved using a common-drain feedback stage whereas variable gain is realized using a resistive attenuator. The circuit has been designed in a 65 nm CMOS process and achieves 22 dB maximum gain, 29 dB gain range, 3...

Super wideband (SWB) communication calls more and more attention as can be seen by the standardization activities of SWB extensions for well-established wideband codecs, e.g. G.722 or G.711.1. This paper presents a technical solution for extending the G.722 codec and compares the new technology to other standardized SWB codecs. Hereby, a closer look is given on the concept of extending technolo...

In this paper, we propose various defected ground structures (DGS) for improving the return loss and impedance bandwidth of an ultra wideband antenna. A comparative parametric analysis has been made on the basis of return loss, gain, radiation pattern characteristics and impedance bandwidth. Simulation results are analyzed and presented for an ultra wideband antenna with four slots in its radia...

With the ambitious aim to exploit the specific advantages of ultra-wideband (UWB) radio sensors for medical applications the project ultraMEDIS has been designed. The project focuses on the combination of UWB radar with magnetic resonance imaging, UWB radar based breast cancer detection, identification of various physiological signatures and the development of appropriate UWB antennas to accomp...

A wideband off-grid model is proposed to represent dictionary mismatch under the compressive sensing framework exploiting difference co-arrays. A group sparsity based off-grid method is proposed for underdetermined wideband direction of arrival (DOA) estimation which provides improved performance over the existing group sparsity based method with a same search grid. A two-step approach is then ...

Abstract—In this paper, a wideband planar dipole antenna is proposed. Compared to conventional dipole antennas, this antenna has wideband impedance matching, simple structure and compact size. From EM simulations, dimensions of antennas are chosen for better performance. For verification, this newly proposed structure is fabricated and measured. It is shown that return loss of the antenna betwe...

Several wideband antennas are presented for either wireless application. This paper presents the performance of a simple monopole antenna loaded with an annular dielectric resonator as a wideband transmitting/receiving antenna. By adjusting the length of the monopole and load arm, a 10-dB bandwidth of 94% is achieved while maintaining monopole-like radiation pattern, which covers UWB applicatio...

Custom design of wideband digital array patterns requires a systematic approach to mapping design specifications to a program understandable by optimization engines. We show that, like in the narrowband case, wideband array patterns are closely related to multidimensional FIR filter responses, suggesting the adaptation of powerful and efficient filter design techniques to the array problem. Pre...

An effective technique for mixer LO harmonic rejection in a SAW-less wideband receiver front-end is proposed. The proposed technique provides a tunable notch that can be placed at any frequency like mixer LO harmonics, to avoid the aliasing in baseband after mixing. An analog LC notch is used in a cascode transconductor, and it can reject one of the 3rd or 5th harmonics. T...

A technique for the digital background calibration of subsampling time-interleaved analog-to-digital converters is proposed. The technique corrects the errors due to gain, offset and timing mismatches among the time-interleaved channels by estimating and nulling the errors with respect to a reference channel through least mean squares loops. Wideband undersampled differentiator filters are expl...