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Shen, Y. (author)This thesis focuses on digital-intensive up-converters for sub-6GHz wireless communication. Nowadays, wireless cellular communication is entering its 5th generation (5G), driven by the demand for faster mobile access and higher data throughput. 5G utilizes larger modulation bandwidths, higher-order modulations, and (many) more transmitters and...doctoral thesis 2021
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Bagdonas, Faustas (author)Many applications require wide bandwidth transmitters, but unfortunately, they usually have way less than 50% average drain efficiency for their modulated signals. This low efficiency is a significant drawback in all wireless applications, both for battery power devices and base stations. The Doherty radio frequency (RF) power amplifier...master thesis 2021
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Hoogelander, Martijn (author)This thesis investigates the performance limits and design challenges of two current-mode front-end concepts that target WiFi and mm-wave 5G applications, respectively. The first concept is a power amplifier (PA), which operates at 2.4GHz and is driven by a direct-digital RF modulator (DDRM). A design for the PA, which also includes a parallel...master thesis 2021
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Pashaeifar, M. (author), de Vreede, L.C.N. (author), Alavi, S.M. (author)This article presents a wideband energy-efficient transmitter (TX) for 5G mm-wave phased-array systems. It features an advanced double-quadrature direct upconverter (DQ-DUC) to improve its in-band linearity and spectral purity. The proposed TX architecture incorporates an efficiency-enhanced balanced power amplifier (EEBPA) that mitigates...journal article 2021
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Kumaran, A.K. (author), Pashaeifar, M. (author), D'Avino, Marco (author), de Vreede, L.C.N. (author), Alavi, S.M. (author)Continuous Class F (CCF) power amplifiers (PAs) overcome Class-F PA's disadvantage of narrow bandwidth by relaxing the short-circuit requirement at the 2<sup>nd</sup> harmonic while still maintaining 90.7% peak efficiency over the band of interest. This paper proposes four different CCF output networks, with their design procedure, suitable...conference paper 2021
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Hashemi, M. (author)One of the biggest challenges in modern transmitter (TX) design, when going from the fourth generation (4G) to fifth generation (5G) communications network, is to handle the increased linearity requirements without introducing any compromise in the energy efficiency of the TX line-up. In analog systems, high quality for the TX signal can be only...doctoral thesis 2020
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Tong, X. (author)In recent years, the demand for the wireless connectivity is increasing and leads to the research into the above 100GHz design. Developments have been made with the circuit and technologies to make the circuit operate at 100GHz. The current availability of silicon-based technologies providing devices with ft/fmax frequencies exceeding 300-GHz...master thesis 2020
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Sabti, Abbas (author), Bouman, Lars (author)This report describes the design of different amplifiers that are part of an FM transceiver. This is part of a larger project, which has the objective to design a complete FM transceiver from discrete components only, meaning that IC technology is not considered. <br/>The circuits designed are two baseband amplifiers, an intermediate frequency...bachelor thesis 2020
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Bruinsma, Quinten (author)The ever increasing demand for faster data rates combined with the need for higher levels of integration, while keeping the production and operation cost to a minimum leads to the requirement of an efficient high bandwidth digital transmitter architecture. With the shortcomings of both polar and cartesian architectures, a new architecture is...master thesis 2020
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Karmakar, S. (author), Zhang, H. (author), van Veldhoven, Robert (author), Breems, Lucien J. (author), Berkhout, M. (author), Fan, Q. (author), Makinwa, K.A.A. (author)This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ Σ M-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed...journal article 2020
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Hashemi, M. (author), Zhou, Lei (author), Shen, Y. (author), de Vreede, L.C.N. (author)This article presents the first application of a digital-intensive intrinsically linear digitally controlled class-E technique in a Doherty configuration. By careful nonlinear segmentation and multiphase RF-clocking along with overdrive-voltage control and automatic duty-cycle correction, it is shown that even the nonlinearities related to...journal article 2019
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van Baarle, Ruben (author), Ramlal, Darshan (author)This thesis explains the design process of two subsystems of a radio transmitter and receiver. The goal of the project is to transmit audio over a distance using FM modulation. This report will focus on the power amplifier leading to the transmitting antenna and the low noise amplifier connected to the receiving antenna. A design process for a...bachelor thesis 2019
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Newadj, Kiren (author)Clean drinking water is still not widely available around the globe and therefore remains an unsolved issue. In fact, 1 in 9 people lack daily access to safe water and sanitation. Groundwater is a water supply source that needs minor treatment and thereby presents itself as a good solution to this global issue. Especially in development...master thesis 2019
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Giri, Amitava (author)In 5G transmitters, high efficiency, high linearity, and compatibility with MIMO and beamforming techniques are of utmost importance. Typically, enhancement techniques like supply modulation or load modulation are used when dealing with envelope modulated communication signals, which increasingly have high peak-to-average-power ratios (PAPR)....master thesis 2018
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Ramesh, Anand (author)Automotive RADARs have gained popularity recently as a means to sense obstacles and avoid collisions, thus preventing loss of life related to vehicular incidence. Research in object detection is increasingly tending towards the 77GHz automotive RADAR band, owing to the availability of larger bandwidths, resulting in high range resolution....master thesis 2017
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Bouazzata, Bilal (author), van der Kolk, Niels (author)In this thesis, a new RF Power Amplifier design is proposed that targets for improving the efficiency profile of classical RF Amplifiers. This RF Power Amplifier is especially designed for modulation schemes that need a PA with high PAPR. The PA consists of two different stages that will be digitally controlled. One of these stages has an...bachelor thesis 2017
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Buijs, L. (author), Hoogelander, M. (author)In this work, a switched-device power amplier using bias control is designed and realized. The PA operates at a frequency of 100MHz. Test results show that the PA achieves a PAE of 63% at −6dB power back-off and 60% at the peak output power of 40dBm. First, an overview of the state-of-the-art PA technology and performance in high PAPR...bachelor thesis 2017
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Feng, Jun (author), Louwerse, Alexander (author)The objective of the bachelor graduation project detailed in this thesis is the development of a system suited for testing radio frequency (RF) power amplifiers (PAs). This PA test system is in particular set up for testing two-transistor interpolating-supply amplifiers.<br/>Interpolating-supply PAs are efficiency-enhanced by employing multiple...bachelor thesis 2017
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Stoopman, M. (author), Philips, Kathleen (author), Serdijn, W.A. (author)This paper presents the system and circuit design of a compact radio frequency (RF)-powered 2.4-GHz CMOS transmitter (TX) to be used for autonomous wireless sensor nodes (WSNs). The proposed TX utilizes the received dedicated RF signal for both energy harvesting as well as frequency synthesis. A TX RF carrier is derived from the received RF...journal article 2017
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- D'Avino, M. (author) master thesis 2016