Optimized design of pulsed waveform oscillators

We present a technique for the optimized design of pulsed-waveform oscillators. This design is based on a closed-loop configuration, with the transistor output matched to a short nonlinear transmission line (NLTL). Class E and Class D operation classes, providing different waveforms at the NLTL input, are compared. Attention is paid to the oscillator phase noise, describing a simple procedure for an accurate calculation of the phase sensitivity functions with respect to specific circuit noise sources. The influence of crucial design elements on the oscillator efficiency, pulse amplitude and duty cycle is analyzed, as well as the effect on the phase noise behaviour. The predictions obtained when using stationary and cyclostationary noise-source models are compared with the measurement results. The techniques have been successfully applied to the design of a pulsed oscillator at 900 MHz.