PT Unknown AU Cao, A Jiang, L Chen, SH Antipov, SV Shi, SC TI IF gain bandwidth of a quasi-optical NbN superconducting HEB mixer SE Proc. International conference on microwave and millimeter wave technology PY 2007 BP 1 EP 3 DI 10.1109/ICMMT.2007.381462 DE HEB; mixer; gain bandwidth AB In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage of the minimum noise temperature, and becomes larger when the bias voltage increases. PI Builin ER