9.47 For each of the emitter-degenerated differential amplifiers shown in Fig. P9.47, find the differential half-circuit and derive expressions for the differential gain Ad and differential input resistance Rid. For each circuit, what dc voltage appears across the bias current source(s) in the quiescent state (i.e., with v id = 0)? Hence, which of the two circuits will allow a larger negative VCM?

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images - 9.47 For each of the emitter-degenerated differential amplifiers shown in Fig. P9.47, find the differential half-circuit and derive expressions for the differential gain Ad and differential input resistance Rid. For each circuit, what dc voltage appears across the bias current source(s) in the quiescent state (i.e., with v id = 0)? Hence, which of the two circuits will allow a larger negative VCM?

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