Response to the following problem:
For VDD =1.3 Vand using IREF =100 μA, it is required to design the circuit of Fig. to obtain an output current whose nominal value is 100 μA. Find R if Q1: and Q2: are matched with channel lengths of 0.5 μm, channel widths of 5 μm, Vt = 0.4 V, and K1n = 500 μA/V2.
What is the lowest possible value of VO? Assuming that for this process technology the Early voltage V1A =5 V/μm, find the output resistance of the current source. Also, find the change in output current resulting from a +0.5-V change in VO.
