This Is AuburnElectronic Theses and Dissertations

Wide Temperature Range SiGe HBT Noise Parameters Modeling and LNA Design




Ma, Rongchen

Type of Degree

Master's Thesis


Electrical Engineering


This work investigates SiGe HBT noise parameters and impedance matched Low-Noise Ampli ers(LNAs) intended for operation across a wide temperature range from 93 to 393 K. For the IBM 5AM technology used, noise performance improves with cooling until about 150 K, then degrades some due to carrier freeze-out. With a temperature independent bias current, an LNA designed for 300 K operation shows acceptable performance from 93 to 393 K, albeit with some degradation of linearity below 120 K.