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Stabilization Scheme for Hot-Electron Bolometer Receivers Using Microwave Radiation

Stabilization Scheme for Hot-Electron Bolometer Receivers Using Microwave Radiation
 
Sergey Ryabchun, Cheuk Yu Edward Tong, Member, IEEE, 
Raymond Blundell, and Gregory Gol’tsman
 
Abstract - We present the results of a stabilization scheme for terahertz receivers based on NbNhot-electron bolometer (HEB) mixers that uses microwave radiation with a frequency much lower than the gap frequency of NbN to compensate for mixer current fluctuations A feedback control loop, which actively controls the power level of the injected microwave radiation, has successfully been implemented to stabilize the operating point of the HEB mixer. This allows us to increase the receiver Allan time to 10s and also improve the temperature resolution of the receiver by about 30% in the total power mode of operation.
 
Index Terms - Allan variance, hot-electron bolometer (HEB) mixer, radiometer equation, terahertz receivers.
 
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