Defining BJT Noise Equations_bjt noise summary-优快云博客

本文详细介绍了双极结型晶体管(BJT)的噪声模型，包括热噪声、散粒噪声和闪烁噪声等不同类型的噪声电流方程。同时，还提供了与基极电流相关的散粒噪声和闪烁噪声的计算方法，并概述了集电极电流产生的散粒噪声。

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Defining BJT Noise Equations

Equations for modeling BJT thermal, shot, and flicker noise are as follows.

Defining Noise Equations

The mean square short-circuit base resistance noise current equation is:

The mean square short-circuit collector resistance noise current equation is:

The mean square short-circuit emitter resistance noise current equation is:

The noise associated with the base current is composed of two parts: shot noise and flicker noise. Typical values for the flicker noise coefficient, KF, are 1e-17 to 1e-12. They are calculated as:

where fknee is noise knee frequency (typically 100 Hz to 10 MHz) and q is electron charge.

The noise associated with the collector current is modeled as shot noise only.

Noise Summary Printout Definitions

RB, V2/Hz	output thermal noise due to base resistor
RC, V2/Hz	output thermal noise due to collector resistor
RE, V2/Hz	output thermal noise due to emitter resistor
IB, V2/Hz	output shot noise due to base current
FN, V2/Hz	output flicker noise due to base current
IC, V2/Hz	output shot noise due to collector current
TOT, V2/Hz	total output noise: TOT= RB + RC + RE + IB + IC + FN