13-02-2013, 03:04 PM
BJT CHARACTERISTICS
BJT.docx (Size: 225.15 KB / Downloads: 15)
Aim:
To obtain input and output characteristics of BJT (BC107B) in any two configurations (at least) and to calculate h parameters from the characteristic curves obtained.
Selection of components and equipment ranges: -
Note relevant manufacturer specifications of the device from data sheet. Some of the relevant specifications are ICmax, IBmax, VBEmax, VBEtypical VCEmax, and hfe.
Select the range of variation of VBB & VCC.
Choose available standard values for Rb, Rc values (with appropriate wattage), so that they limit IB and IC in the circuit to be less than their allowable maximum ratings. One may use the relations
Rb=(VBB-VBEactive)/IB, Rc=(VCC-VCEsat)/IC.
Select the suitable ranges for ammeter(s) and voltmeter(s).
Identify the terminals of BJT by noting down its base diagram from manufacturer’s data sheet. Also test the condition of the device (good or blown off) and component values.