Growing concern over global climatic and environmental changes and our urgent need to quantify track and understand their impact on our planet's atmosphere, oceans, and land surfaces have prompted the development of extremely sensitive and technologically sophisticated instruments. To meet the challenges of these next generation instruments, a new class of high performance electronics needs to be developed. In this SBIR Phase II proposal, Mosaix proposes to design and build two separate low power, and compact single board digital poly-phase Fast Fourier Transform spectrometer (FFTS) optimized for the back-end signal processing requirements of next generation instruments. These two spectrometer designs are targeted to meet different mission requirements and leverage a common FPGA based digital electronic design and spectrometer IP core. Whilst sharing a common architecture, the boards differ in the analog-to-digital (ADC) samplers used at the front-end of the spectrometer and the actual FPGA device used for the digital signal processing tasks. The first spectrometer design is for a 8 GHz bandwidth spectrometer targeted for earth observing (EOS) missions. The second spectrometer design is for a 750 MHz bandwidth spectrometer targeted for planetary radiometer missions. The spectrometers developed under this SBIR will be state-of-the-art spectrometers.