BJT Emitter Stabilized Bias

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BJT Emitter Stabilized Bias ELEC 121

Improved Bias Stability The addition of RE to the Emitter circuit improves the stability of a transistor output Stability refers to a bias circuit in which the currents and voltages will remain fairly constant over a wide range of temperatures and transistor forward current gain () The temperature (TA or ambient temperature) surrounding the transistor circuit is not always constant Therefore, the transistor  is not a constant value January 2004 ELEC 121

BJT Emitter Bias Draw Equivalent Input circuit Draw Equivalent Output circuit Write necessary KVL and KCL Equations Determine the Quiescent Operating Point Graphical Solution using Loadlines Perform a Computational Analysis January 2004 ELEC 121

Emitter-Stabilized Bias Circuit Adding an emitter resistor to the circuit between the emitter lead and ground stabilizes the bias circuit over Fixed Bias January 2004 ELEC 121

Base-Emitter Loop January 2004 ELEC 121

Equivalent Network January 2004 ELEC 121

Reflected Input impedance of RE January 2004 ELEC 121

Base-Emitter Loop Applying Kirchoffs voltage law: - VCC + IB RB + VBE +IE RE = 0 Since: IE = ( + 1) IB We can write: - VCC + IB RB + VBE + ( + 1) IB RE = 0 Grouping terms and solving for IB: Or we could solve for IE with: January 2004 ELEC 121

Collector-Emitter Loop January 2004 ELEC 121

Collector-Emitter Loop Applying Kirchoff’s voltage law: - VCC + IC RC + VCE + IE RE = 0 Assuming that IE  IC and solving for VCE: VCE = VCC – IC (RC + RE) If we can not use IE  IC the IC = IE and: VCE = VCC – IC (RC + RE) Solve for VE: VE = IE RE Solve for VC: VC = VCC - IC RC or VC = VCE + IE RE Solve for VB: VB = VCC - IB RB VB = VBE + IE RE January 2004 ELEC 121

Transistor Saturation At saturation, VCE is at a minimum We will find the value VCEsat = 0.2V For load line analysis, we use VCE = 0 To solve for ICSAT, use the output KVL equation: January 2004 ELEC 121

Load Line Analysis The load line end points can be calculated: At cutoff: At saturation: January 2004 ELEC 121

Emitter Stabilized Bias Circuit Example January 2004 ELEC 121

Design of an Emitter Bias CE Amplifier ELEC 121 January 2004 Design of an Emitter Bias CE Amplifier Where .1VCC  VE  .2VCC And .4VCC  VC  .6VCC January 2004 ELEC 121 Fixed Bias

Emitter Bias with Dual Supply January 2004 ELEC 121

Emitter Bias with Dual Supply Input Output January 2004 ELEC 121