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Bipolar Amplifier Bias and Signals

Bipolar Amplifier Bias and Signals. Electronic Design Laboratory. Overview. BJT Specifications Curve Tracer Model Feedback stabilizes bias point Small-signal voltage gain Pre-lab. 2N3904 Specifications. Absolute Maximum Rating (You fry’em, you buy’em)

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Bipolar Amplifier Bias and Signals

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  1. Bipolar Amplifier Bias and Signals Electronic Design Laboratory

  2. Overview • BJT Specifications • Curve Tracer Model • Feedback stabilizes bias point • Small-signal voltage gain • Pre-lab

  3. 2N3904 Specifications • Absolute Maximum Rating (You fry’em, you buy’em) • Thermal Characteristics for high power design • Electrical Characteristics • Min  No part will fall below this value • Max  no part will go above this value

  4. 2N3904 Specifications • Spice model for Qbreakout part if not in library • Typical Characteristics

  5. 2N3904 Specifications • Test Circuits

  6. IC VCE VCE time ib time Curve Tracer Model Vce max Rload C Ib/Step B E DUT

  7. Output Characteristics • Select NPN for the device. • Set the other parameters • After you obtain a “good” characteristic select cursor and the curve tracer will calculate the DC beta

  8. Current Gain • hFE = F = DC • Used when BJT biased • Given in Electrical Characteristics • Varies over wide range • Permanently reduced if emitter and collector reversed • hfe = o = AC

  9. Prelabs • Review Data Sheet • Study handout • For Figure 2 (a), (b), and (c) • Make calculation for the 2N3904 only • Determine equations bias resistors • Determine equations for small-signal voltage gain (vo/vi)

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