Chapter 10, Problem 10.3EP

The parameters of the circuit shown in Figure 10.5 are: $V^{+}=3V,V^{-}=-3V$ , and $R_1=30k\Omega$ . The parameters of the transistors $Q_1$ and $Q_2$ are $V_{BE1,2}\left(on\right)=0.7V$ and $\beta =120$ . The parameters of the transistor $Q_3$ are $V_{BE3}\left(on\right)=0.6V$ and ${\beta }_3=80$ . Assume $V_A=\infty$ for all three transistors. Determine the value of each current shown in the figure.(Ans. $I_{REF}=0.15667mA,I_O=0.15663mA=I_{C1}=I_{C2},I_{B1}=I_{B2}=1.3053\mu A,I_{E3}=2.6106\mu A,I_{B3}=0.03223\mu A$ )