Riccardo Brama

Learn More
In this paper we present a reconfigurable Class-E Power Amplifier (PA) whose operation frequency covers all uplink bands of GSM standard. We describe the circuit design strategy to reconfigure PA operation frequency maximizing the efficiency. Two dies, manufactured using CMOS and MEMS technologies, are assembled through bondwires in a SiP fashion.(More)
The design of CMOS power amplifiers (PA) is still a challenging issue. Efficiency is one of the key requirements, but it is usually obtained at the expense of large device stress. The latter can be reduced by introducing a cascode solution, which features an efficiency penalty due to dissipative mechanisms associated with MOS capacitive parasitics,(More)
A 65 nm CMOS receiver including a tapered chain linear equalization and a mixer based clock recovery circuit capable of SSC tracking is presented. The proposed architecture works up to 10 Gb/s with transmission channels with more than 20 dB loss at Nyquist, while consuming 110 mA and occupying 0.25 mm<sup>2</sup>.
This paper shows that CMOS Class-E PAs are capable of high Power-Added Efficiency (PAE), even when delivering large output powers at Radio Frequency (RF). In particular, a cascode device is used to obtain high efficiency while assuring reliable operation. A differential solution has been adopted to maximize 2nd harmonic suppression and minimize potential(More)
Wireless sensors networks enable the chance to investigate with enhanced freedom physical phenomena, aiming to increase the informative content obtained by sensors measurements. In this work we will focus on a system allowing to experimentally measure pressure profiles obtained from sensor nodes deployed on a NACA0012 aircraft wing model. By exploiting(More)
The ability to gather and analyze distributed data adding value to extracted information is a core concept in the Internet of Things. Smart-Objects with multi-sensor capability further enhance environmental awareness with coherent and meaningful information. In this paper we first investigate a modular architecture for multi-sensors Smart-Objects allowing(More)
We present a novel fully differential input/output distributed transformer topology used for the design of millimeter-wave power amplifiers. Input/output distributed transformers are used to feed the input signal to four differential couples and to combine their output power. This topology improves the stability and the efficiency of the power amplifier,(More)
In the recent past, we witnessed to a dramatic growth of networks with a huge number of interconnected wireless nodes exchanging large amounts of information. This has brought to the need of ad-hoc, energy-aware protocols suitable for low-power and lossy networks. Among these, Routing Protocol for Low Power and Lossy Networks (RPL) is surely one of the most(More)
  • 1