Question

Vcc=10 V Rc R1 Vout, collector Cin 2N3904 Vout, emitter Vin R2 Re 0 V 1. Choose values of R1, R2, Rc and Re to give 1 volt at the emitter and 5 volts at the collector for a typical beta transistor with 1 mA collector current at room temperature, and state them with a complete schematic. Use 1% tolerance resistors for this design. 2. What is the collector voltage with your values for a minimum, typical, and maximum current gain device? 3. What is the collector voltage with your values at 100 °C for a typical device? 4. Estimate the maximum range of collector voltage, for a typical device at room temperature, which results from using 10% tolerance resistors. 5. Calculate the effect of changing your initial design Vcc to +15 Volts with no other changes in the circuit components. Describe the impact this change will have on circuit operation with output taken at the collector. 6. Simulate your basic design using Vcc of +10V and then +15V. Compare collector voltages with your analysis for typical devices at room temperature.

          Vcc=10 V
Rc
R1
Vout, collector
Cin
2N3904
Vout, emitter
Vin
R2
Re
0 V
1. Choose values of R1, R2, Rc and Re to give 1 volt at the emitter and 5 volts at
the collector for a typical beta transistor with 1 mA collector current at room
temperature, and state them with a complete schematic. Use 1% tolerance
resistors for this design.
2. What is the collector voltage with your values for a minimum, typical, and
maximum current gain device?
3. What is the collector voltage with your values at 100 °C for a typical device?
4. Estimate the maximum range of collector voltage, for a typical device at room
temperature, which results from using 10% tolerance resistors.
5. Calculate the effect of changing your initial design Vcc to +15 Volts with no
other changes in the circuit components. Describe the impact this change will
have on circuit operation with output taken at the collector.
6. Simulate your basic design using Vcc of +10V and then +15V. Compare
collector voltages with your analysis for typical devices at room temperature.

Vcc=10 V
Rc
R1
Vout, collector
Cin
2N3904
Vout, emitter
Vin
R2
Re
0 V
1. Choose values of R1, R2, Rc and Re to give 1 volt at the emitter and 5 volts at
the collector for a typical beta transistor with 1 mA collector current at room
temperature, and state them with a complete schematic. Use 1% tolerance
resistors for this design.
2. What is the collector voltage with your values for a minimum, typical, and
maximum current gain device?
3. What is the collector voltage with your values at 100 °C for a typical device?
4. Estimate the maximum range of collector voltage, for a typical device at room
temperature, which results from using 10% tolerance resistors.
5. Calculate the effect of changing your initial design Vcc to +15 Volts with no
other changes in the circuit components. Describe the impact this change will
have on circuit operation with output taken at the collector.
6. Simulate your basic design using Vcc of +10V and then +15V. Compare
collector voltages with your analysis for typical devices at room temperature.

Added by Alison M.

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