I have a few doubt about the darlington pair characteristic. After reading all the sources, i know that darlington pair has a higher current gain and a low input impedance. Then i start to prove it through experiments.

Figure1 is the common collector by using one transistor. and Figure2 is common collector using a darlington pair. Both has the same resistors value.

Figure1

Figure2

after calculation i found that, the Figure2 design just increase the input impedance by 4k ohm. And Ic for Figure1 is ~4.7mA while Ic for Figure2 is ~4.37mA. So what i curious about is isnt it Figure2 should have a more higher current compare to Figure1? If not what is the purpose i use the darlington pair since i get almost the same Ic by using the Figure1 design.

This is the question i cant figure out.

Hope someone can help me on this.

thank you.