UWB impulse radar in 90 nm CMOS

Recently, the FCC has released a very wide unlicensed spectrum allocation from 3.1 to 10.6 GHz. The allowed emission in this spectrum is very low, so the use of this spectrum allocation limits itself to relatively short range applications. The fact that CMOS technology now reaches speeds of tens of GHz, opens up a whole new area of interesting possibilities to create cheap and wide band radio technology. One application here, is short-range radar. Thanks to the wide spectrum allocation the radar is able to send impulses rather than bursts of a carrier wave. This makes processing of the received signal much easier than the matched filters which are required in the carrier wave burst case. In this master thesis we present two related sampling techniques for radar applications which use mostly digital circuitry and which can achieve high sampling rates. We have called these circuits, which are partially based on the Suprathreshold Stochastic Resonance (SSR) principle, swept threshold and stochastic resonance samplers. Although the samplers are mostly digital, which makes them perfect for CMOS, they are not clocked. We discover that for the case where the input signal contains much noise, typical for radars, the crudeness of these simple samplers does actually not have a very detrimental effect on the signal processing. A radar implementation in 90 nm CMOS using these samplers is presented, which is shown to reach sampling rates of about 23 GHz

Digital ultra wideband technology for biomedical applications

Master'sMASTER OF ENGINEERIN

Contact and remote breathing rate monitoring techniques: a review

ABSTRACT: Breathing rate monitoring is a must for hospitalized patients with the current coronavirus disease 2019 (COVID-19). We review in this paper recent implementations of breathing monitoring techniques, where both contact and remote approaches are presented. It is known that with non-contact monitoring, the patient is not tied to an instrument, which improves patients’ comfort and enhances the accuracy of extracted breathing activity, since the distress generated by a contact device is avoided. Remote breathing monitoring allows screening people infected with COVID-19 by detecting abnormal respiratory patterns. However, non-contact methods show some disadvantages such as the higher set-up complexity compared to contact ones. On the other hand, many reported contact methods are mainly implemented using discrete components. While, numerous integrated solutions have been reported for non-contact techniques, such as continuous wave (CW) Doppler radar and ultrawideband (UWB) pulsed radar. These radar chips are discussed and their measured performances are summarized and compared

LOW-POWER IMPULSE-RADIO ULTRA-WIDEBAND TECHNIQUES FOR BIOMEDICAL APPLICATIONS.

Ph.DDOCTOR OF PHILOSOPH

Radar Technology

In this book “Radar Technology”, the chapters are divided into four main topic areas: Topic area 1: “Radar Systems” consists of chapters which treat whole radar systems, environment and target functional chain. Topic area 2: “Radar Applications” shows various applications of radar systems, including meteorological radars, ground penetrating radars and glaciology. Topic area 3: “Radar Functional Chain and Signal Processing” describes several aspects of the radar signal processing. From parameter extraction, target detection over tracking and classification technologies. Topic area 4: “Radar Subsystems and Components” consists of design technology of radar subsystem components like antenna design or waveform design