2p 2i 221 Some applications (e.g., differential amplifiers or cascode amplifiers) require current sources with a very high output resistance. One of the methods for achieving this goal is by using the principle of cascoding. The figure shows a double-cascode current source, which is used to generate some bias current I for the circuit above it. The transistors Q1-Q3 are identical and have the same bias point. Determine (approximately) the value of the small-signal resistance of this current source, Tout, seen looking into the drain of Q3, as indicated in the figure. VDD Circuit VBIAS3 Q3 VBIAS2Q2 VBIAS1 Q1 Tout I = 0.2 mA Vov = 0.1 V VA = 1.5 V Tout 15 k b Tout 22.5 ks? Tout 30 kn 4 Tout 225 k Tout 2.7 MS- Tout 5.4 M g Tout 7 MR h Tout 13 MQ

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