Response to the following problem:
Using VDD = 1.8 V and a pair of matched MOSFETs, design the current-source circuit of Fig. to provide an output current of 150-μAnominal value. To simplify matters, assume that the nominal value of the output current is obtained at VO ? VGS. It is further required that the circuit operate for VO in the range of 0.3 V to VDD and that the change in IO over this range 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 utilized, μnCox = 400 μA/V2, V? A = 10 V/μm, and Vt = 0.5 V.
