The aim of this work is to tackle the problem modulation wave shaping in field near communication (NFC) radio frequency identification (RFID). For purpose, a high-efficiency transmitter circuit was developed comply with strict requirements newest EMVCo and NFC Forum specifications for pulse shapes. proposed uses an outphasing modulator that based on digital-to-time converter (DTC). DTC supports...

Nowadays the main driving parameters for the research in radio transmitters in wireless infrastructure are energy efficiency, frequency agility, and integration. This thesis presents new solutions at the device waveform-, circuit-, and transmitter level which exploit the inherent high efficiency potential of switchmode power amplifiers (SMPAs) for realization of energy efficient, wide-band, hig...

Digital assistance is among many aspects that can be leveraged to help analog/mixedsignal designers keep up with the technology scaling. It usually takes the form of predistorter or compensator in an analog/mixed-signal system and helps compensate the nonidealities in the system. Digital assistance takes advantage of the process scaling with faster speed and a higher level of integration. When ...

Visible light communication (VLC) takes advantage of the widespread use light-emitting diodes (LEDs), and by modifying driver stage, LEDs are capable lighting transmitting information. One main drawbacks is low power efficiency due to modification LED stage in order add capability. Most research work related VLC toward task, whereas there a limited about improvement on efficiency. This article ...

Gallium–nitride power transistor (GaN HEMT) and integrated circuit technologies have matured dramatically over the last few years, and many hundreds of thousands of devices have been manufactured and elded in applications ranging from pulsed radars and counter-IED jammers to CATV modules and fourth-generation infrastructure base-stations. GaN HEMT devices, exhibiting high power densities coupl...