According to the circuit in Fig. $6\mathrm{.}1,$ the reference voltage Vref is supplied from an independent voltage source, and we want to eliminate this additional voltage source requirement. Design a circuit that generates the Vref from the voltage source Vdd$.$ As a result, a single voltage source of $12$ V supplies the whole circuit. Hint: Rather than a resistive divider circuit, use a diode$-$resistor pair to deliver a regulated voltage to the non inverting terminal of the op$-$amp. Draw your complete design

Figure $6\mathrm{.}1$ The circuit schematic of the voltage regulator circuit Show the derivation of equation $(6\mathrm{.}1).$