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# Resistance Parameters in Terms of Hybrid Parameters

Author: Leonard Krugman

The relationship between the r and h values can be determined by straightforward substitution and the simultaneous solution of equations 7-1 and 7-2, as follows:

A. when i2 = 0. Under this condition

 Ci = h11ix + h12e2 Eq. (7-1A) 0 = h21i1 + h22e2 Eq. (7-2 A)

If these are solved simultaneously,

 and therefore Eq. (7-3)

B. when i2 = 0. Under this condition equation 7-2A still

applies and is solved

 Eq. (7-4)

C. when i1 = 0. Under this condition

 e1 = h12e2 Eq. (7-1B) i2 = H22e2 Eq. (7-2B)

If these are solved simultaneously

 and Eq. (7-5)

D. when i1 = 0. For this relationship equation 7-2B still

applies and is solved

 and Eq. (7-6)

E. The current gain

As a numerical example of these conversions, the manufacturer's rating sheet for the G.E. type 2N45 specifies the following typical values for the hybrid parameters: hn = 40 ohms, h12 = 2.5 x 10-4, h21 = - .92, h22 = 1.0 x 10-6 mhos.

Then

Last Update: 2007-07-12