High-Frequency and Noise Performances of 65-nm MOSFET at Liquid Nitrogen Temperature

In this paper, the high-frequency properties of MOSFETs at low-temperature operation are investigated through measurements and electrical simulations. The experimental results show that the device achieves a 335-GHz fmaxand a 300-GHz ftwhen operating at low temperature (78 K), which constitutes, respectively, a 78% and 34% improvement compared to the room temperature performances (296 K). The minimum noise figure NFmindecreases from 1.4 dB (296 K) to 0.5 dB at 30 GHz (78 K), while the associated gain increases from 8 to 12 dB