When simulating a PNP amplifier circuit using TLSPICE, the obtained results are significantly different from expectations.

Question

The simulation results are incorrect when using a PNP transistor. With an input of 1V, the output should be 5V according to the circuit. However, the final result is completely wrong. When I use an NPN transistor with the same parameters, the results are correct.Please refer to the image below for details.Looking forward to your help.

qiaobi · Accepted Answer

The cause has been found. It was due to the output impedance mismatch. After adjusting the resistances of the load resistors R5, R3, and R4, the output became normal.)

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Thread Details

When simulating a PNP amplifier circuit using TLSPICE, the obtained results are significantly different from expectations.

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