Nuevas herramientas para el diseño de osciladores de microondas de alta eficiencia

A new systematic method is presented for the design of high-efficiency microwave oscillators. It is based on the control of the transistor output-voltage waveform, through the combined use of a nonperturbing auxiliary generator and a substitution generator. The nonperturbing generator sets the oscillation frequency at the desired value during the entire design process. The combination of the two generators allows obtaining a quasisquare output-voltage waveform, with optimum harmonic components to maximize the efficiency. Attention is paid to the stability and phase noise of the implemented oscillator, which are analyzed versus technological parameters. A 6-GHz oscillator has been designed using these techniques, with good experimental results

Novel and Efficient Hw-Sw Developments in Millimeter Wave Antenna Measurement Facilities

The aim of this communication is to show recent developments in the field of millimeter-wave antenna test ranges. Measurement facilities are complete systems used to acquire the radiated field by an antenna under test. When operating in millimeter waves, some common implementation principles become simply unaffordable. Manufacturing tolerances, structures computation times and available RF power offered by instrumentation become challenging aspects to cope with in millimeter waves. The developments shown in this paper focus on these issues

Técnica de optimización no lineal para osciladores en software comercial

In this article a nonlinear optimization technique is presented for oscillators design in commercial Harmonic Balance Software. The technique is based on the insertion of a non-perturbing auxiliary generator in the circuit topology of the oscillator. Optimization of the oscillation frequency, the output power and the quality-factor is obtained

Optimización no lineal de mezcladores autooscilantes

New non-linear optimisation techniques for the design of self-oscillating mixers are presented. The techniques enable fixing the self-oscillation frequency and selecting the optimum self-oscillating amplitude for maximum conversion gain. Using bifurcation-theory concepts, it has been possible to increase the range with self-oscillating-mixer operation. The new techniques have been applied to the design and simulation of a 5.5GHz-0.5GHz down-converter obtaining very good agreement with the experimental results