2. Wilson Current Mirror (20) The following circuit shows a MOS Wilson mirror in which Q1 and Q3 are matched, and they have the same (W/L), ratio that is 2 times of the (W/L)2 of Q2. All MOSFETs have the same V. 1) Derive the relationship between Loud and IREF. 2) Using small-signal model of the MOSFETs, derive and appreciate the output resistance of the current source, Ro. VDD lout Ro IREF Q3 Ires Loz ↓ IDi Q₁ Q2 -Vss