This paper focuses on the effect of single event transients on AlGaN/GaN on sapphire high-electron-mobility-transistors (HEMTs). This results in a novel study in high performance transistors using sapphire substrate. Technology computer aided design tools are used in order to perform the radiation simulations, once the DC response of the transistors have been reproduced. Results show the relationship of the drain current density with ion energy and angle of incidence. The current increases as the ion penetrates deeper in the device due to higher energies, while it decreases as the angle increases. To our knowledge, angle strikes have never been studied before in AlGaN/GaN HEMTs. Several charge collection mechanisms are discussed and their relationships with ion energy and angle of incidence are established.

This paper presents a thorough study of radiation effects on a frequency synthesizer designed in a 0.18 $\mathsf{\mu }$ m CMOS technology. In CMOS devices, the effect of a high energy particle impact can be modeled by a current pulse connected to the drain of the transistors. The effects of SET (single event transient) and SEU (single event upset) were analyzed connecting current pulses to the drains of all the transistors and analyzing the amplitude variations and phase shifts obtained at the output nodes. Following this procedure, the most sensitive circuits were detected. This paper proposes a combination of radiation hardening-by-design techniques (RHBD) such as resistor–capacitor (RC) filtering or local circuit-redundancy to mitigate the effects of radiation. The proposed modifications make the frequency synthesizer more robust against radiation.

In this paper, a microwave monolithic integrated circuit (MMIC) high-power amplifier (HPA) for Ku-band active radar applications based on gallium nitride on silicon (GaN-on-Si) is presented. The design is based on a three-stage architecture and was implemented using the D01GH technology provided by OMMIC foundry. Details on the architecture definition and design process to maximize delivered power are provided along with stability and thermal analyses. To optimize the amplifier performance, an asymmetry was included at the output combiner. Experimental results show that the HPA achieves a 39.5 dBm pulsed-mode output power, a peak linear gain of 23 dB, a drain efficiency of 27%, and good input/output matching in the 16–19 GHz frequency range. The chip area is 5 × 3.5 mm${}^2$ and for the measurements was mounted on a custom-made module. These results demonstrate that GaN-on-Si-based Solid-State Power Amplifiers (SSPAs) can be used for the implementation of Ku-band active radars.

This paper analyses the effects of single-event transients (SETs) on CMOS low noise amplifiers (LNA) designed for a 0.18 μ m technology. Two well-known topologies, the common-source and common-gate cascodes, have been analysed when heavy ions strike the most sensitive nodes of these structures. In order to simulate these strikes both a physics-based technology computer aided design (TCAD) tool and an electrical circuit domain simulator have been used. This way the physics information given by the TCAD tool is combined with the fast transient simulations performed in circuit simulators. To study their SET performance, the maximum voltage peak and the recovery time of the output signal were calculated for both LNAs. Additionally, a safe operating area can be defined, setting the boundaries for acceptable SETs. Radiation hardening by design techniques have been applied at the most vulnerable nodes of both LNAs. The proposed mitigation approaches make both LNAs hardened against radiation, considerably improving their SET performance.

This paper presents a low power 2.4 GHz receiver front-end for 2.4-GHz-band IEEE 802.15.4 standard in 0.18 μm CMOS technology. This receiver adopts a low-IF architecture and comprises a variable gain single-ended low-noise amplifier (LNA), a quadrature passive mixer, a variable gain transimpedance amplifier (TIA) and a complex filter for image rejection. The receiver front-end achieves 42 dB voltage conversion gain, 10.3 dB noise figure (NF), 28 dBc image rejection and -5 dBm input third-order intercept point (IIP3). It only consumes 5.5 mW.