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In the circuit shown, both the enhancement mode NMOS transistors have the following characteristics:$k_{n} ݇ = \mu _{n}C_{ox}(W/L) = 1\:mA/V^{2};V_{TN} = 1V.$ Assume that the channel length modulation parameter $\lambda$ is zero and body is shorted to source. The minimum supply voltage ܸ$V_{DD}$ (in volts) needed to ensure that transistor $M_{1}$ operates in saturation mode of operation is _______.