Lecture # 5 2014 Hybrid Equivalent Model Shoubra/Electrical... · Lecture # 5 2014 Hybrid...
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Lecture # 5 Hybrid Equivalent Model
Instructor: Dr. Ahmad El-Banna
Benha University Faculty of Engineering at Shoubra
No
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ECE-312 Electronic Circuits (A)
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Agenda
Two-Port Systems Approach
Cascaded Systems
The Hybrid Equivalent Model
Approximate & Complete h-model
Hybrid π Model
Troubleshooting and Practical Applications 2
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TWO PORT SYSTEMS APPROACH 3
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2-Port System
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2-Port System..
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CASCADED SYSTEMS 6
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Cascaded Systems
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• Examples: RC Coupled ct & Cascode ct • Check Examples: 5.15 & 5.16
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THE HYBRID EQUIVALENT MODEL 8
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The Hybrid Equivalent Model
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• The re model has the advantage that the parameters are defined by the actual operating conditions,
• the parameters of the hybrid equivalent circuit are defined in general terms for any operating conditions.
short-circuit forward transfer current ratio parameter
short-circuit forward transfer current ratio parameter
open-circuit reverse transfer voltage ratio parameter
short-circuit input-impedance parameter
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Transistor Hybrid Equivalent ct
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• For Transistor:
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Hybrid vs. re model
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APPROXIMATE & COMPLETE H-MODEL 12
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Approximate h-model
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• Fixed Bias ct
• Check other configurations !!
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Complete h-model
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HYBRID Π MODEL 15
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Hybrid π Model
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It includes parameters that do not appear in the other two models primarily to provide a more accurate model for high-frequency effects.
• The resistance rπ (using the symbol π to agree with the hybrid π terminology) is simply βre as introduced for the common-emitter re model.
• The output resistance ro is the output resistance normally appearing across an applied load. • The resistance rb includes the base contact, base bulk, and base spreading resistance levels. • The resistance ru (the subscript u refers to the union it provides between collector and base
terminals) is a very large resistance and provides a feedback path from output to input circuits in the equivalent model.
• All the capacitors are stray parasitic capacitors between the various junctions of the device.
• The controlled source can be a voltage-controlled current source (VCCS) or a current-controlled current source (CCCS), depending on the parameters employed.
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VARIATIONS OF TRANSISTOR PARAMETERS
• The parameter hfe(β) varies the least of all the parameters of a transistor equivalent circuit when plotted against variations in collector current.
• All the parameters of a hybrid transistor equivalent circuit increase with temperature.
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TROUBLESHOOTING & PRACTICAL APPLICATIONS
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Troubleshooting • In general, if a system is not working properly, first disconnect the ac
source and check the dc biasing levels.
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PRACTICAL APPLICATIONS
• Audio Mixer
• Preamplifier
• Random-Noise Generator ! • Sound-Modulated Light Source !
Report: com3_14_R02_xx Deadline: 17 Nov. @11:59 pm
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• For more details, refer to:
• Chapter 5 at R. Boylestad, Electronic Devices and Circuit Theory, 11th edition, Prentice Hall.
• The lecture is available online at:
• http://bu.edu.eg/staff/ahmad.elbanna-courses/11966
• For inquires, send to:
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