Chapter 8, Problem 8.28P

Consider the class−AB output stage in Figure P8.28. The diodes and transistors arc matched, with parameters $I_S=6\times {10}^{\text{-12}}\text{A}$ , and $\beta =40$ . (a) Determine $R_1$ such that the minimum current in the diodes is 25mA when ${\upsilon }_O=\text{24V}$ . Find $i_N$ and $i_P$ for this condition. (b) Using the results of part (a), determine the diode and transistor currents when ${\upsilon }_O=0$ .

Figure P8.28