Noise in BJT. The objective is to determine , and for a bipolar transistor. The hybrid- model that includes the noise sources is shown below Fig 5-3
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The objective is to determine , and for a bipolar transistor.
The hybrid- model that includes the noise sources is shown below
The feedback elements . This is OK for frequency < . At frequencies above that value the noise mechanisms are partially correlated.
is caused by the thermal noise of the base-spreading resistance. the noise current generator is the shot noise of the total base current, and is the shot noise of the collector current.
The 1/f noise contribution is represented by a single noise current generator which flows through the entire base resistance. The spectral density of 1/f noise is given by