Could some electronics gueu here clarify this a bit. Typical SPICE BJT models include the parameters RB, RC and RE wich add resistances at the respective terminals, and are small valued, e.g., 0.77 etc., Recently, I came across a reference in literature the input resistance of a transistor(under examination) is 1200.0 Uhms. Is it possible that the authors could have been referring to something else ? An AC analysis of a simple common emitter amplifier while measuring the voltage at the base, and current flowing into the base, gives a measure of the input resistance over that frequency rahge, but such calculated values are never that high. Any hints, suggestions would be helpful. Thanks in advance.
- posted
5 years ago