7.61 Figure P7.61 shows an alternative equivalent-circuit representation of an amplifier. If this circuit is to be equivalent to that in Fig. 7.34(b) show that Gm = Av o/Ro. Also convince yourself that the transconductance Gm is defined as G m = i ovi R L =0 and hence is known as the short-circuit transconductance. Now, if the amplifier is fed with a signal source (vsig,Rsig) and is connected to a load resistance R L show that the gain of the amplifier proper Av is given by Av = GmRo RL and the overall voltage gain Gv is given by

61 9 - 7.61 Figure P7.61 shows an alternative equivalent-circuit representation of an amplifier. If this circuit is to be equivalent to that in Fig. 7.34(b) show that Gm = Av o/Ro. Also convince yourself that the transconductance Gm is defined as G m = i ovi R L =0 and hence is known as the short-circuit transconductance. Now, if the amplifier is fed with a signal source (vsig,Rsig) and is connected to a load resistance R L show that the gain of the amplifier proper Av is given by Av = GmRo RL and the overall voltage gain Gv is given by

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images - 7.61 Figure P7.61 shows an alternative equivalent-circuit representation of an amplifier. If this circuit is to be equivalent to that in Fig. 7.34(b) show that Gm = Av o/Ro. Also convince yourself that the transconductance Gm is defined as G m = i ovi R L =0 and hence is known as the short-circuit transconductance. Now, if the amplifier is fed with a signal source (vsig,Rsig) and is connected to a load resistance R L show that the gain of the amplifier proper Av is given by Av = GmRo RL and the overall voltage gain Gv is given by

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