8.78 Consider the BJT cascode amplifier of Fig. 8.38 for the case all transistors have equal β and ro. Show that the voltage gain Av can be expressed in the form A v = − 12  VA  /V T VT  VA  +(1/β) Evaluate A v for the case  VA  = 5 V and β = 50. Note that except for the fact that β depends on I as a second-order effect, the gain is independent of the bias current I!

8.78 - 8.78 Consider the BJT cascode amplifier of Fig. 8.38 for the case all transistors have equal β and ro. Show that the voltage gain Av can be expressed in the form A v = − 12  VA  /V T VT  VA  +(1/β) Evaluate A v for the case  VA  = 5 V and β = 50. Note that except for the fact that β depends on I as a second-order effect, the gain is independent of the bias current I!

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images - 8.78 Consider the BJT cascode amplifier of Fig. 8.38 for the case all transistors have equal β and ro. Show that the voltage gain Av can be expressed in the form A v = − 12  VA  /V T VT  VA  +(1/β) Evaluate A v for the case  VA  = 5 V and β = 50. Note that except for the fact that β depends on I as a second-order effect, the gain is independent of the bias current I!

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