D 8.3 Using VDD = 1.8 V and a pair of matched MOSFETs, design the current-source circuit of Fig. 8.1 to provide an output current of 150-µA nominal value. To simplify matters, assume that the nominal value of the output current is obtained at VO VGS. The circuit must operate for VO in the range of 0.3 V to VDD and the change in IO over this range must be limited to 10% of the nominal value of IO. Find the required value of R and the device dimensions. For the fabrication-process technology used, μnCox = 400 µA/V2, = 10 V/µm, and Vt = 0.5 V.