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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

Bipolar Amplifier Bias and Signals

Electronic Design Laboratory

overview
Overview
  • BJT Specifications
  • Curve Tracer Model
  • Feedback stabilizes bias point
  • Small-signal voltage gain
  • Pre-lab
2n3904 specifications
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
2n3904 specifications4
2N3904 Specifications
  • Spice model for Qbreakout part if not in library
  • Typical Characteristics
2n3904 specifications5
2N3904 Specifications
  • Test Circuits
curve tracer model

IC

VCE

VCE

time

ib

time

Curve Tracer Model

Vce max

Rload

C

Ib/Step

B

E

DUT

output characteristics
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
current gain
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
prelabs
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)