Several architectures have been developed to produce a high quality RF-signal largely depending on the application. The use of commercial off-the-shelf electronic components is not allowed for space applications. Therefore space-qualified components have to be used. Several possible solutions were investigated in the framework of the ALTIUS mission (Atmospheric Limb Tracker for the Investigation of the Upcoming Stratosphere) [1], [2]. The goal of this mission is to measure atmospheric trace species concentration profiles with a high spatial resolution [3]. The concept relies on the acquisition of spectral images of the bright atmospheric limb at specific wavelengths. Three independent channels will be implemented inside the instrument, each working in a different spectral range, namely ultraviolet (UV): 250 to 400 nm, visible (VIS): 440 to 800 nm and near-infrared (NIR): 900 to 1800 nm. In two of the three channels, a wide aperture TeO2 AOTF will be used for the selection of different spectral wavelengths. The working principle of an AOTF is based on the interaction of sound and light inside a birefringent crystal [4], [5]. The RF-power is converted into acoustic power by means of a piezoelectric transducer. For every specific RF-frequency and RF-power, only photons of particular energy will interact with the sound wave inside the crystal. The diffracted beam exits under a different angle than the rest of the light. The beam of interest is focused onto a detector which performs the spectral imaging.