Chapter 10, Problem 10.7EP

Figure 10.12 shows the N-output current mirror. Assuming all transistors are matched, with a finite gain and $V_A=\infty$ , derive Equation (10.38). If eachload current must be within 10 percent of $I_{REF}$ , and if $\beta =50$ , determine the maximum number of load transistors that can be connected. (Ans. $N=4$ )