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Low Noise Front End Signal Transport Design For L-Band Phased Array Receivers, Spencer M. Ammermon
Low Noise Front End Signal Transport Design For L-Band Phased Array Receivers, Spencer M. Ammermon
Theses and Dissertations
RF receiver improvements in size, weight, power, and sensitivity are constant goals in the wireless communications community. The combination of phased array antenna systems with high speed analog to digital converters helps engineers meet these goals, because many of the analog components and tasks found in a traditional receive chain are moved into the digital domain. Although the hard work of signal reception is moved into digital signal processing, digital receivers rely on a high performance analog front end to properly condition a signal before analog to digital conversion. In this thesis, two RF front ends are developed for direct …
Rf-Over-Fiber Receiver Design And Link Performance Verification For Alpaca Signal Transport, Nathaniel Ray Ashcraft
Rf-Over-Fiber Receiver Design And Link Performance Verification For Alpaca Signal Transport, Nathaniel Ray Ashcraft
Theses and Dissertations
The Advanced L-band Phased Array Camera (ALPACA) is a wide-field astronomical receiver that will be housed on the Green Bank Telescope (GBT). This instrument features a fully cryogenic 69-element phased array feed (PAF) front end and digital beamformer back end. It will provide a wide and continuous field of view at L-band and high sensitivity with a system noise temperature below 27 K. Transport of the received astronomical signals on 138 individual channels from prime focus of the GBT to the digital back end -- over a distance of 3 km -- will be provided by a custom RF-over-fiber (RFoF) …