TRANSISTOR CHARACTERIZATION AND ACTIVE NETWORK STUDIES
Abstract
At moderate to high values of emitter current in a transistor, the effect of the majority carrier current upon the minority carrier distribution is not negligible. An expression for the electric field in the base, consistent with the majority as well as the minority carrier distribution is derived, and an approximate solution of the resulting equation, valid at moderate to high values of emitter currents, is given. The effect of the emitter current on the characteristics of the charged carriers is taken into account in carrying out the computations for a typical pnp transistor. The calculations indicate that: (1) the dc transport factor decreases monotonically with increasing emitter current, (2) the emitter efficiency saturates to a limit at high emitter currents, and (3) the common base cut off frequency increases to a maximum at relatively moderate emitter currents, and then monotonically falls off to zero at exceedingly high emitter currents. These results are in agreement with known experimental data. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1961
- Accession Number
- AD0262275
Entities
People
- A.i. Larky
- J.j. Karakash
- T.b. Ramachandran
Organizations
- Lehigh University