Problem:
1. Sketch the p-channel counterpart of the current-source circuit of Figure. Note that while the circuit of Figure should more appropriately be called a current sink, the corresponding PMOS circuit is a current source. Let VDD = 1.3 V, / Vt /= 0.4 V, Q1:
and Q2:
be matched, and μpCox = 80 μA/V2. Find the device W/L ratios and the value of the resistor that sets the value of IREF so that a nominally 80-μA output current is obtained. The current source is required to operate for VO as high as 1.1 V. Neglect channel-length modulation.
