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The specific RF power generation mechanism of PIN-IMPATT diodes at high current density as applied in pulsed operation is described and confirmed by a realistic computer model. It is shown that these devices can be operated at large-signal avalanche resonance, where they deliver relatively high output power at high impedance level.
A simple and accurate method for determining the FM noise of negative-resistance regenerative oscillators in the microwave region is the so-called direct detection system, where the FM-AM noise conversion is achieved with a discriminator, usually a high Q-factor cavity. With increasing oscillator frequency (above 30 GHz), however, it becomes increasingly difficult to obtain reliable discriminators...
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