The emitter-follower circuit shown in Figure P5.89 is biased at (V^{+}=2.5 mathrm{~V}) and (V^{-}=-2.5 mathrm{~V}). Design a

Question:

The emitter-follower circuit shown in Figure P5.89 is biased at $V^{+}=2.5 \mathrm{~V}$ and $V^{-}=-2.5 \mathrm{~V}$. Design a bias-stable circuit such that the nominal $Q$-point values are $I_{C Q} \cong 5 \mathrm{~mA}$ and $V_{C E Q} \cong 2.5\mathrm{~V}$. The transistor current gain values are in the range $100 \leq \beta \leq 160$. Select standard 5 percent tolerance resistance values in the final design. What is the range in $Q$-point values?

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