Figure P10.1 shows another form of a bipolar current source.

(a) Neglecting base currents, derive the expression for \(I_{C}\) in terms of the circuit, transistor, and diode parameters.

(b) If the transistor \(\mathrm{B}-\mathrm{E}\) and diode voltages are equal, show that, for \(R_{1}=R_{2}\), the expression for \(I_{C}\) reduces to\ [I_{C}=\frac{\left(-V^{-}\right)}{2 R_{3}}\]

(c) For \(V^{-}=-10 \mathrm{~V}\) and \(V_{B E}\) (on) \(=V_{\gamma}=0.7 \mathrm{~V}\), design the circuit such that \(I_{C}=I_{1}=I_{2}=2 \mathrm{~mA}\).

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R3 R ww D ZD 12 R2 www V Figure P10.1