Chapter 10, Problem 10.14P

Consider the circuit shown in Figure P 10.14. The transistor $Q_2$ is equivalentto two identical transistors in parallel, each of which is matched to $Q_1$ . Assume the transistor parameters are $V_{BE}\left(on\right)=0.7V$ , $\beta =60$ , and $V_A=\infty$ ,and assume the bias voltage is $V^{+}=2.5V$ . Design the circuit such that $I_O=0.50mA$ and determine the value of $I_{REF}$ .