A study on transit time fluctuation, and correlation between low frequency phase and current or amplitude noises in a transistor

摘要

The low frequency phase and amplitude or average collector current noises are studied in a bipolar transistor. The transit time fluctuation is calculated from the diffusion coefficient fluctuation in the base. The phase noise is proportional to the base transit time fluctuation of the carriers. We discuss the relation between the phase and amplitude fluctuations and find both fluctuations correlate each other in low frequency. An experimental study is carried out in a bipolar transistor.