Q2. (8 + 8 = 16 points) For the multistage Darlington pair BJT circuit shown below, assume: $\beta_1 = \beta_1 = 100$, $V_{BE1(ON)} = V_{BE2(ON)} = 0.8 V$, $V_A = \infty$ (that is, ignore $r_o$) a) Find the value of $R_1$ needed to bias the circuit so that $V_{CE2} = 6 V$. b) Give expressions for $R_{in}$ and $A_v$.
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We want Vcn to be 6V, so we need to find the appropriate biasing voltage for the base of Q1. The base-emitter voltage of Q1 is VBE1 = 0.8V. The voltage across R1 is 12V - VBE1 = 11.2V. Using Ohm's Law, we can find the current flowing through R1: I1 = (12V - Show more…
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