In this contribution, research activities and trends in the field of RF and microwave power amplifiers design are discussed. Design strategies for high efficiency and linearity amplifiers are focused and the results attained in three years of TARGET NoE activities are presented, showing interesting and state-of-the-art power amplifier design, employing GaAs or GaN technologies. Introduction The...

We will report on progress in quasi-optical power amplifiers at Caltech since last year’s meeting, where we reported a 5-W, Ka-band grid amplifier with a waveguide mode converter. This year we have developed an indium-phosphide V-band grid amplifier. The amplifier has been tested both as a transmission amplifier with a waveguide mode converter on the input and output side, and as a reflection a...

When performing low-frequency noise measurements on low-impedance electron devices, transformer coupling can be quite effective in reducing the contribution of equivalent input voltage preamplifier to background system. However, devices are usually performed with a biased device under test. A bridge configuration must used null DC component at transformer. Unfortunately, using results complicat...

Co-design of digital signal-processing (DSP) algorithms and power-amplifier characteristics can lead to improved efficiency and linearity through a variety of strategies including: predistortion, DSP control over bias conditions, particularly the power supply voltage, and DSP generation of digital input signals for switching amplifiers. This paper discusses several amplifier architectures that ...

Date The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. Phase Noise in Microwave Oscillators and Amplifiers Thesis directed by Professor Zoya Popovi´c This thesis presents analysis and measurements of phase noise in oscilla-tors and amplifie...

submitted to IEEE ICOPS’99, June 20-24, 1999, Monterey, CA Analytical Theory of Multi-Stage Gyro-Amplifiers G.S. Nusinovich University of Maryland, College Park, Md 20742-3511 and B. Levush Naval Research Laboratory, Washington, DC 20375-5000 Nowadays there is an active development of high-power, largebandwidth, high-gain gyro-amplifiers for various applications. Design of such amplifiers is us...

Recently, Pareto-based multi-objective optimization methods are widely used in optimizing several complex engineering problems. In this paper, we present a Non-dominated Sorting based global optimization algorithm combined with novel efficient Constraint analysis to design ultra-low-voltage and low-power operational Transconductance Amplifiers (OTAs) for the application of LV, LP and medium spe...