We present early results of noise temperature measurements made on a Planck LFI EBB Ka-band low noise amplifier at physical temperatures as low as 1.5 K. This temperature is an order of magnitude lower than typically used on radio astronomy receiver systems. The results are tentatively compared with semi-empirical predictions made by Pospieszalski.
In this work, we describe monolithic millimeter-wave integrated circuit (MMIC) Low Noise Amplifier (LNA) and mixer designs for U-Band, also known as the WR19 waveguide band (40-60 GHz). The LNAs were fabricated in NGC's 35 nm InP HEMT MMIC process. The MMICs were packaged in WR19 waveguide housings and tested for noise, both at room temperature and… (More)
There is a growing demand for implementing low-power and low-cost wireless sub-soil sensing systems to support precision agriculture. This paper describes an RFID sub-soil system that is capable of hosting a range of sensors and communicating their measurements wirelessly to farming vehicles. In addition to providing an overview of the system, the paper… (More)
We present the designs for and the results of a prototype cryogenic Ka-band low noise amplifier (LNA), that is based on the hybridization of microwave integrated circuits (MICs) and monolithic microwave integrated circuits (MMICs). The resulting transistor plus MMIC (T+MMIC) 5 stage LNA, has a peak gain of 52dB, a minimum noise temperature of 12K at an… (More)
Selection of the optimum gate periphery dimension of transistors is essential in LNA design for all applications. There are no explicit theoretical expressions to determine the dependency of the four noise parameters on the device gate periphery. Such dependency relationships can provide better guidance in device selection. In this work a dependency of… (More)