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Miscellaneous BJT Bias Circuits

Miscellaneous BJT Bias Circuits. ELEC 121. Transistor Switching Networks. Transistors with only the DC source applied can be used as electronic switches. Switching Circuit Calculations. The transistor will switch between saturation and cutoff regions. You must ensure that:

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Miscellaneous BJT Bias Circuits

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  1. Miscellaneous BJT Bias Circuits ELEC 121

  2. Transistor Switching Networks Transistors with only the DC source applied can be used as electronic switches ELEC 121

  3. Switching Circuit Calculations • The transistor will switch between saturation and cutoff regions. • You must ensure that: • Also consider the resistance across the transistor at saturation: • The resistance across the transistor in cutoff is theoretically infinite, but it is calculated: ELEC 121

  4. Switching Circuit Calculations ELEC 121

  5. Switching Time Another consideration is the time it takes the transistor to switch. ELEC 121

  6. Example with VEE ELEC 121

  7. Example with VCC and VEE ELEC 121

  8. Determining VTH ELEC 121

  9. Determining RTH ELEC 121

  10. The Thévenin equivalentcircuit ELEC 121

  11. Common-collector (emitter-follower) configuration ELEC 121

  12. Common-base configuration. ELEC 121

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