Defining BJT Noise Equations

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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

Star-Hspice Manual - Release 2001.2 - June 2001

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