RF generator techniques for space applications

A deeper insight into the performance of a Hilbert transform and PLL-based generation technique for space missions. The use of an RF generator is quite common in lab testing environments as well as in commercial applications. Many different RF generation techniques exist, both analog and digital. The frequency-domain sets the complexity of the circuit. It is commonly accepted that the higher the frequency, the more complex the design becomes. Designing for space applications change things quite drastically. Elements as survivability, radiation, and redundancy also come into play. Taking into account that adaptations are not any longer possible after launch, implies that the implemented design has to be one hundred percent robust. The complexity rises when designing for scientific missions like for NASA or ESA because of the more severe imposed constraints. This article tries to give an idea about how to design a pure sinewave RF generator at rather low frequencies (< 500 MHz) for a scientific mission capable of surviving under the harsh environmental conditions of space, dealing with the space agency restrictions and limited availability of approved electrical components.