Lecture 4

Lecture 4 - Lecture4 Lecture4 BJTBiasing EE3220 June12,2003 (Noemitterresistor ,but

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Lecture 4 Lecture 4 Parameter Independent  Parameter Independent  BJT Biasing BJT Biasing EE 3220 June 12, 2003 Instructor – John Scalzo
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BJT Inverter Without Feedback BJT Inverter Without Feedback (No emitter resistor) (No emitter resistor) DC bias point can be designed for a  symmetrical output swing range, but  changes to ß will change the slope of the  transfer characteristic and the bias point will  no longer be at the midpoint. V out  = V cc  – (I c )(R c ):      I c  =  β (I b )    β  T  and  ƒ(device) T     β     I c      I c R c    V out   Recall:  Design  V out  = ½ V cc  for max symmetrical ac  swing range .
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Input signal applied to Vb (both), emitter resistor added for feedback and  parameter independent biasing.  Both circuits biased for maximum  symmetrical swing range at Vout =1/2 Vcc Inverter without feedback Inverter without feedback Inverter with feedback Inverter with feedback
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This note was uploaded on 01/25/2012 for the course EE 3220 taught by Professor Audiffred during the Spring '06 term at LSU.

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Lecture 4 - Lecture4 Lecture4 BJTBiasing EE3220 June12,2003 (Noemitterresistor ,but

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