Chapter 13, Problem 13.16TYU

Consider the LF155 BiFET input stage in Figure 13.25. The p−channelJFET parameters are $I_{DSS}=300\mu \text{A}$ , $V_p=1\text{V}$ , and $\lambda =0.01{\text{V}}^{-1}$ . The supply voltagesare $V^{+}=5\text{V}$ and $V^{-}=-5\text{V}$ . Let $V_{BE}\left(\text{npn}\right)=0.6\text{V}$ and $V_{EB}\left(\text{pnp}\right)=0.6\text{V}$ .Determine the bias currents $I_{C3},I_{C2}$ , and $I_{C1}$ . (Ans. $I_{C1}=I_{C2}=I_{C3}=300\mu \text{A}$ )