ELEC 121 January 2004 BJT Fixed Bias ELEC 121 Fixed Bias.

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Presentation transcript:

ELEC 121 January 2004 BJT Fixed Bias ELEC 121 Fixed Bias

BJT Biasing 1 For Fixed Bias Configuration: Draw Equivalent Input circuit Draw Equivalent Output circuit Write necessary KVL and KCL Equations Determine the Quiescent Operating Point Graphical Solution using Loadlines Computational Analysis Design and test design using a computer simulation January 2004 ELEC 121

Complete CE Amplifier with Fixed Bias January 2004 ELEC 121

Fixed Bias and Equivalent DC Circuit January 2004 ELEC 121

Fixed-Bias Circuit January 2004 ELEC 121

DC Equivalent Circuit January 2004 ELEC 121

Base-Emitter (Input) Loop Using Kirchoff’s voltage law: – VCC + IBRB + VBE = 0 Solving for IB: January 2004 ELEC 121

Collector-Emitter (Output) Loop Since: IC =  IB Using Kirchoff’s voltage law: – VCC + IC RC + VCE = 0 Because: VCE = VC – VE Since VE = 0V, then: VC = VCE And VCE = VCC - IC RC Also: VBE = VB - VE with VE = 0V, then: VB = VBE January 2004 ELEC 121

BJT Saturation Regions When the transistor is operating in the Saturation Region, the transistor is conducting at maximum collector current (based on the resistances in the output circuit, not the spec sheet value) such that: January 2004 ELEC 121

Determining Icsat ELEC 121 January 2004 Fixed Bias January 2004

Determining ICSAT for the fixed-bias configuration January 2004 ELEC 121

Load Line Analysis January 2004 ELEC 121

Load Line Analysis The end points of the line are : ICsat and VCEcutoff For load line analysis, use VCE = 0 for ICSAT, and IC = 0 for VCEcutoff ICsat: VCEcutoff: Where IB intersects with the load line we have the Q point Q-point is the particular operating point: Value of RB Sets the value of IB Where IB and Load Line intersect Sets the values of VCE and IC. January 2004 ELEC 121

Circuit values effect Q-point January 2004 ELEC 121

Circuit values effect Q-point (continued) January 2004 ELEC 121

Circuit values effect Q-point (continued) January 2004 ELEC 121

Load-line analysis January 2004 ELEC 121

Fixed-bias load line January 2004 ELEC 121

Example January 2004 ELEC 121

DC Fixed Bias Circuit Example January 2004 ELEC 121

Loadline Example Family of Curves ELEC 121 January 2004 Loadline Example Family of Curves January 2004 ELEC 121 Fixed Bias