Chapter 17, Problem 17.34P

For the transistors in the TTL circuit in Figure P17.34, the parameters are ${\beta }_F=100$ and ${\beta }_R=0.3$ (for each input emitter). (a) For ${\upsilon }_X={\upsilon }_Y={\upsilon }_Z=2.8\text{V}$ determine $i_{B1}$ , $i_{B2}$ , and $i_{B3}$ . (b) For ${\upsilon }_X={\upsilon }_Y={\upsilon }_Z=0.1\text{V}$ , determine $i_{B1}$ and $i_{B4}$ for a fanout of 5.

Figure P17.34