VHF/UHF Transceiver with Digital Signal Processing

The innovative approach in designing the radio part of the professional VHF/UHF (narrow-band) transceivers based on the application of the digital intermediate frequency stages known from the wide-band systems is presented. The main problem is the dynamic range of the analog to digital converter, which is the weakest part of the concept. The combination of the presented common analog RF front end and digital implementation of the further receiver stages improves production repeatability and reduces production and setup costs and the final size of the transceiver in comparison to pure analog design. We presented the parameters of the key blocks, which are RF filters and Digital Down Converter including analog to digital converter, that substantially contribute to the complete design. The proper selection and design of such parts show the valuable impact to the proposed approach of digital signal processing based transceiver.