Design a generalized Widlar current source (Figure P10.34) to provide a bias current of (I_{O}=100 mu mathrm{A})

Question:

Design a generalized Widlar current source (Figure P10.34) to provide a bias current of $I_{O}=100 \mu \mathrm{A}$ and an output resistance of $R_{o}=10 \mathrm{M} \Omega$. The circuit is to be biased at $V^{+}=3 \mathrm{~V}$ and $V^{-}=-3 \mathrm{~V}$. The transistor parameters are $I_{S}=10^{-15} \mathrm{~A}$ and $V_{A}=120 \mathrm{~V}$.

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