A Prototype Digital Radiometer for Noise Metrology Applications: A Metrology-Grade Digital Radiometer

Receiver technology has evolved significantly over the past decades. A variety of receiver architectures have been developed for addressing different applications
[1]
. In general, more and more analog components have been replaced by their digital counterparts. The recent advance in ultrafast sampling digitizers has even enabled digital front ends, completely eliminating analog down-conversion
[2]
,
[3]
. Although the state-of-art direct RF-sampling systems are particularly attractive and promising for new generations of communications, challenges of high power consumption and high cost hinder their current feasibility and applications
[3]
.