Partial derivatives - transistor hybrid model, Electrical Engineering

Partial derivatives - Transistor hybrid model:

The partial derivatives are taken by keeping the collector voltage or base current constant as pointed out by the subscript attached to the derivative.

ΔvB , ΔvC ,  Δ iC , Δ iB present the small signal(increment) base and collector voltages and currents, they are presented by symbols   vb , vc , ib and  ic correspondingly. 

 Eqs (3) and (4) may be written like as follow:

             Vb = hie ib + hre Vc                                                                 

              ic = hfe ib + hoe Vc

in which   hie =(∂f1/∂iB)Vc =  (∂vB/∂iB)Vc = (ΔvB /ΔiB)Vc = (vb / ib)Vc         

                  hre =(∂f1/∂vc)IB   =  (∂vB/∂vc) IB = (ΔvB /Δvc) IB = (vb /vc) IB

 

                hfe  =(∂f2/∂iB)Vc =  (∂ic /∂iB)Vc = (Δ ic /ΔiB)Vc = (ic / ib)Vc

                hoe= (∂f2/∂vc)IB   =  (∂ic /∂vc) IB = (Δ ic /Δvc) IB = (ic /vc) IB

The above equations described the h-parameters of the transistor in CE configuration. Similar theory can be extended to transistors in additional configurations.

Hybrid Model and Equations for the transistor in three dissimilar configurations are displayed below.

662_Partial derivatives - Transistor hybrid model.png

Posted Date: 1/11/2013 4:45:10 AM | Location : United States







Related Discussions:- Partial derivatives - transistor hybrid model, Assignment Help, Ask Question on Partial derivatives - transistor hybrid model, Get Answer, Expert's Help, Partial derivatives - transistor hybrid model Discussions

Write discussion on Partial derivatives - transistor hybrid model
Your posts are moderated
Related Questions
Power up the "TIMS" unit by using the switch at the back. Connect the Pico Virtual Instrument (PicoScope) to the PC as per Appendix 1 On the "TIMS" unit, connect the 2 kHz (s

what is crossmagnetisation in dc generator

with the aid of the diagram explain the following rules that can be used to determine the direction of magnetic fields around a current carrying conductor (1)cork screw rule (2)rig


Question: a) For the circuit shown in figure (i) Determine the voltages across R1 and R2 and (ii) Determine the current which flows across R1 and R2. Both D1 and D2 a

Q. Why the gain of the amplifier decreases if the CE is avoided? When the ce is connected in the circuit, ac signals get bypassed through it to the ground. In the absence of Ce

Determine i L (t) and v C (t) for t> 0 in the circuit given in Figure.

What is the main function of dummy coul in winding?

Q. A transformer is rated 10 kVA, 220:110 V (rms). Consider it an ideal transformer. (a) Compute the turns ratio and the winding current ratings. (b) If a 2-load resistance

Q. Write a note on feedback of emitter follower? The emitter follower can be seen to be an example of negative feedback when the relationship is put in the form