Real-time frequency agility is one of the key limitations of current all-digital transmitters
(ADTs). In this paper, to address this problem, an ADT based on direct-RF generation is …

In this work, we present a wireless ultrasonic neurostimulator, aiming at a truly wearable
device for brain stimulation in small behaving animals. A 1D 5-MHz capacitive …

A CMOS RF-PWM transmitter with a Class-D power amplifier (PA) is proposed for Internet of
Things (IoT) applications. The transmitter utilizes two PLL-based PWM generators to convert …

This paper presents two novel transmitter architectures based on the combination of radio-
frequency pulse-width modulation and multiphase pulse-width modulation. The proposed …

The market for wireless portable devices has grown significantly over the recent years.
Wireless devices with ever-increased functionality require high rate data transmission and …

This dissertation fundamentally focuses on two wearable applications based on capacitive
micromachined ultrasonic transducers that are being actively developed in house:(1) a …

Amplitude variation in a switched-capacitor Cartesian quadrature class-D PA can be
achieved by scaling capacitor ratios or by employing pulse-width modulated signals to drive …