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In this paper, differential low-noise amplifiers are presented as a very powerful solution for radio astronomy applications. A fully differential amplifier topology has been analyzed and implemented in microstrip technology with discrete surface mount components. The amplifier design is made for an active receiving dense antenna array. Thus, the differential amplifier source impedance is no longer...
The effect of non-commensurate constituent transmission lines on the performance of the equal-delay topology for transformers and balancing networks is quantified. It is shown that when the load behaves as an isolated 2-terminal impedance or when the sum port connection is open-circuited to provide current balun operation, even a small difference in electrical lengths causes a complete nulling of...
In this study we have presented a new technique for wideband impedance-matching using a lumped circuit for relatively short non-resonant dipoles or monopoles. The belief is that one simple fixed-topology network can be used to perform wideband impedance matching for a variety of dipole-like antennas, thereby simplifying the matching process. The particular circuit suggested in the present paper includes...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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