Characterization of BJTs and Single Stage BJT Amplifier
Lab 3 – Characterization of BJTs and Single Stage BJT Amplifier
Part 1: NPN transistor Characteristics
The Graph of Characteristics of NPN transistors
Part 2: PNP transistor Characteristics
The Graph of Characteristics of PNP transistors
Part 3: Forward current gain and Early Voltage determination
a) Using the data from SPA, plot the IC vs VCE characteristics of the npn and pnp transistors
b) Determine, from the graph, the DC β and the early voltage for npn transistor at IC = 500µA
c) Determine, from the graph, the DC β and the early voltage for npn transistor at IC = 1mA
d) Determine, from the graph, the DC β and the early voltage for pnp transistor at IC = 500µA
e) Compare these with the datasheet published values
Part 4: Single stage transistor amplifier
The Schematic of the Designed Single Stage Common Emitter Amplifier with Accurate Values
RBB1: 388.9kΩ
RBB2: 67.48kΩ
RC: 14.830kΩ
RE: 14.776kΩ
CC1: 100µF
CC2: 100µF
a. Voltage at node A: -1.447V Voltage at node B: -1.683V Voltage at node C: 2.539V Voltage at node E: -2.449V
b. The transistor currents at node A, B, C and D are: Transistor currents at node A: 3.72075×10-6A Transistor currents at node B: 3.49733×10-6A Transistor currents at node C: 0.000503102A Transistor currents at node E: 0.000511031A
c. The DC β of the transistor calculated from the datasheet is 143.858, and the β value from the SPA plot is 133.298, which is close.
d. The graph of a peak-to-peak output when a small signal input is applied
e. We use the letter A to represent gain. Analyzing from the data we get using SPA,
A = 5.8/0.23 = 25.22
f. The graph of peak-to-peak output when the 100µF capacitor C2 is equipped into the circuit
j. The model BJT created in LT spice using parameters of CA3046
k. The simulation of frequency response of the model BJT
Part 1: NPN transistor Characteristics
The Graph of Characteristics of NPN transistors
Part 2: PNP transistor Characteristics
The Graph of Characteristics of PNP transistors
Part 3: Forward current gain and Early Voltage determination
a) Using the data from SPA, plot the IC vs VCE characteristics of the npn and pnp transistors
b) Determine, from the graph, the DC β and the early voltage for npn transistor at IC = 500µA
c) Determine, from the graph, the DC β and the early voltage for npn transistor at IC = 1mA
d) Determine, from the graph, the DC β and the early voltage for pnp transistor at IC = 500µA
e) Compare these with the datasheet published values
Part 4: Single stage transistor amplifier
The Schematic of the Designed Single Stage Common Emitter Amplifier with Accurate Values
RBB1: 388.9kΩ
RBB2: 67.48kΩ
RC: 14.830kΩ
RE: 14.776kΩ
CC1: 100µF
CC2: 100µF
a. Voltage at node A: -1.447V Voltage at node B: -1.683V Voltage at node C: 2.539V Voltage at node E: -2.449V
b. The transistor currents at node A, B, C and D are: Transistor currents at node A: 3.72075×10-6A Transistor currents at node B: 3.49733×10-6A Transistor currents at node C: 0.000503102A Transistor currents at node E: 0.000511031A
c. The DC β of the transistor calculated from the datasheet is 143.858, and the β value from the SPA plot is 133.298, which is close.
d. The graph of a peak-to-peak output when a small signal input is applied
e. We use the letter A to represent gain. Analyzing from the data we get using SPA,
A = 5.8/0.23 = 25.22
f. The graph of peak-to-peak output when the 100µF capacitor C2 is equipped into the circuit
j. The model BJT created in LT spice using parameters of CA3046
k. The simulation of frequency response of the model BJT