The reference current in each of the constant-current source circuits shown in Figures 11.41 and 11.42 is IREF = 0.5 mA. All bipolar transistor parameters are β = 150 and VA = 80 V, and all MOSFET parameters are: Kn = 500 μA/V2, VTN = 1 V, and λ = 0.0125 V−1. Neglecting bipolar base currents, determine the output resistance Ro of each constant-current source.
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