19. Determine the input and output impedances for each amplifier configuration in Figure 12-69. Aol = 175,000 Zi, = 10 MQ Zou = 75 N Aol = 200,000 Zin = 1 MN Zout = 25 N Aol = 50,000 Zin = 2 MO Zou = 50 N %3D %3D %3D Vin o %3D Vin O d21 Vin O- o Vout o Vout Vout Rf 560 k Rf 47 k2 Rf 1.0 MQ R; R; 1.5 k2 2.7 kN R; 56 k2 (а) (b) (c) FIGURE 12-69

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