Abstract
The analysis of the possibilities for the fully digital microwave frequency discriminator (MFD) realization has been presented in the paper. In classic hardware solutions MFD consists microwave phase discriminator and microwave detectors, realized as microwave circuit. Authors propose a solution completely deprived of the analog microwave circuit, based on the fast A/D converter. Mathematical operations carried out in the microwave circuit are digitally executed, on digital signal samples. The receiver was implemented as the 3-channel MFD, this one gives unambiguous determination of the instantaneous frequency value and high accuracy in the 700 - 3000 MHz band. For the physical implementation, fast digitizer with 12,5 GS/s speed was used and the overall digital processing in the programming LabVIEW environment has been realized. Proposed solution corresponds to the parameters and functionality of the MFD systems in the classic version. Laboratory tests with real RF signals have been made. The measurement accuracy not worse than 10 MHz were obtained, with the most measurements being not worse than 3 MHz.
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