PT Journal
AU Lobanov, YV
   Tong, CE
   Hedden, AS
   Blundell, R
   Voronov, BM
   Gol'tsman, GN
TI Direct measurement of the gain and noise bandwidths of HEB mixers
SO IEEE Trans. Appl. Supercond.
JI IEEE Trans. Appl. Supercond.
PY 2011
BP 645
EP 648
VL 21
IS 3
DI 10.1109/TASC.2010.2095403
DE waveguide NbN HEB mixers
AB The intermediate frequency (IF) bandwidth of a hot electron bolometer (HEB) mixer is an important parameter of the mixer, in that it helps to determine its suitability for a given application. With the availability of wideband low noise amplifiers, it is simple to measure the performance of an HEB mixer over a wide range of IF at a fixed LO frequency using the standard Y-factor method. This in-situ method allows us to measure both the gain and noise bandwidths simultaneously. We have also measured mixer output impedance with a vector network analyser. Intrinsic time constant has been extracted from the impedance data and compared to the mixer's bandwidths determined from receiver Y-factor measurement.
ER