Wide Temperature Range SiGe HBT Noise Parameters Modeling and LNA Design

Abstract

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.