This circuit configuration of NPN transistor is very useful in electronic switch. It has a guaranteed logic high or low when biased properly. This circuit also is can be used in linear operations or amplifier mode by changing the biasing.
This design template will automatically display the device currents; just see the reference picture to which current is to which device. The template also extracts the power dissipations and stresses as well as collector-emitter voltage. The template has two forms. One is in MATHCAD while the other one is in EXCEL. In Mathcad, all the explanations are provided. There is also a PDF copy of the Mathcad template so that the user can still see the derivations if ever he does not have the Mathcad software.
Some Snap Shots of the Mathcad Template