9.20 Find the differential half-circuit for the differential amplifier shown in Fig. P9.20 and use it to derive an expression for the differential gain Ad ≡ vod/vid in terms of gm, RD, and Rs. Neglect the Early effect. What is the gain withR s = 0? What is the value of Rs (in terms of 1/gm) that reduces the gain to half this value?

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images - 9.20 Find the differential half-circuit for the differential amplifier shown in Fig. P9.20 and use it to derive an expression for the differential gain Ad ≡ vod/vid in terms of gm, RD, and Rs. Neglect the Early effect. What is the gain withR s = 0? What is the value of Rs (in terms of 1/gm) that reduces the gain to half this value?

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