Question: Design a pnp version of the Wilson current source, using a resistor to establish (I_{text {REFF }}). The circuit parameters are (V^{+}=9 mathrm{~V}) and (V^{-}=-9

Design a pnp version of the Wilson current source, using a resistor to establish $I_{\text {REFF }}$. The circuit parameters are $V^{+}=9 \mathrm{~V}$ and $V^{-}=-9 \mathrm{~V}$, and the transistor parameters are: $V_{E B}($ on $)=0.7 \mathrm{~V}, \beta=25$, and $V_{A}=\infty$. If the load current is $0.8 \mathrm{~mA}$, what is $I_{\mathrm{REF}}$ ?

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