This paper presents the design of a high-performance dualband wireless capacitive pressure sensor operating in harsh environment. The proposed design is composed of an absolute capacitive pressure sensor, pressure controlled oscillator (PCO), class-E power amplifier (PA) and an antenna. The sensor node collects and transmits the pressure variation in the term of frequency output wirelessly to a...

In this paper, we present an exact analysis of class DE amplifier outside optimum conditions. We derive analytical expressions of waveform equations. By using waveform equations, we derive initial values of current and voltage, switching voltage and the slope of switching voltage, output voltage and power conversion efficiency in steady state. We denote the behavior of class DE amplifier outsid...

As the mobile phone is an essential accessory for everyone nowadays, predistortion for the RF power amplifiers in mobile phone systems becomes more and more popular. Especially, new predistortions for power amplifiers with both nonlinearities and memory effects interest the researchers. In our thesis, novel predistortion techniques are presented for this purpose. Firstly, we improve the digital...

A 50 to 550MHz wideband gallium nitride (GaN) HEMT power amplifier with over 43 dBm output power and 63% drain efficiency has been successfully developed. The demonstrated wideband power amplifier utilizes two GaN HEMTs and operates in a push-pull voltage mode Class D (VMCD). The design is based on a large signal simulation to optimize the power amplifier’s output power and efficiency. To assur...

The design of an integrated CMOS Power Amplifier (PA) for a Jet Propulsion Laboratory (JPL) Synthetic Aperture Radar (SAR) mission is studied. Although there are a number of PA class definitions and published circuits, designing a high efficiency RF PA is still a challenging job. In this thesis, the goal is full integration in Silicon-on-Sapphire (SOS) using on-chip spiral inductors/transformer...

This paper presents a Class-D power amplifier for bandpass pulse width modulated (BP-PWM) and bandpass deltasigma modulated (BP-DSM) signals at 20 MHz. A 1-bit 6-th order topology is used in the ∆Σ-modulator. Integral noise shaping is used in the generation of the bandpass pulse width modulated signal. A two sided pulse width modulation is used with a 6-bit 4th-order noise shaper. The push-pull...