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Lecture 4a - Lecture 4 Lecture Parameter Independent BJT...

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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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BJT Inverter with feedback BJT Inverter with feedback Thevenin equivalent input loop.
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