Determine the dc collector currents in Q 1 and Q 2 , and then the input resistance and voltage gain for the Darlington emitter follower of Fig 3 74 Neglect r Icirc frac14 , r b , and r o Assume that V BE(on) 0 7V Check your answer with SPICE and also use SPICE to determine the output resistance of ...

The DC voltage across the 50 resistor is V O 5 07 07 36 V Thus I O 36 V 50 72 mA The current ...

Determine the dc collector currents in Q 1 and Q 2 , and then the input resistance

Question:

Determine the dc collector currents in Q₁and Q₂, and then the input resistance and voltage gain for the Darlington emitter follower of Fig. 3.74. Neglect r_Î¼, r_b, and r_o. Assume that V_BE(on)= 0.7V. Check your answer with SPICE and also use SPICE to determine the output resistance of the stage.

Figure 3.74

Vcc = 10 V Q1 Q2 Vi 1 kQ 5 V Vo 50 ΩΣ