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
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

Q. Explain the construction and operation of Enhancement MOSFET? The construction of an N-channel enhancement MOSFET is shown in figure below. Two highly doped N + regions are

Q. What do you mean by Conductors and Insulators? In order to put charge in motion so that it becomes an electric current, one must provide a path through which it can flow eas

Q. DTL AND TTL LOGIC CIRCUITs? Bipolar transistorswere the first solid-state switching devices commonly used to implement digital logic circuits in the 1950s and 1960s. These c

derivation of frequency of oscillators clapp and derive C effect?

A 3 phase 400 volt(line to line) wye connected synchronous motor has Xs= 1 ohm per phase and a negligible armature resistance. The field current is so adjusted that the internal(in

8085 processor has 8 bit ALU (Arithmetic Logic Review). Likewise 8086 processor has 16 bit ALU.

Q. What is Pinch - off voltage?  The reverse bias is relatively large near the source. As a result, the depletion region intrudes into the channel near the drain, and the effec

Q. What are the basic operations of  MOSFET? The gate to source voltage is set to zero volts by the direct connection from one terminal to the other,and a voltage Vds is applie