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Question 11.7: Determining the Transresistance-Amplifier Model Find the tra...

Determining the Transresistance-Amplifier Model
Find the transresistance-amplifier model for the amplifier shown in Figure 11.12.

11.12
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With an open-circuit load, the output voltage is

v_{o\mathrm{oc}}=A_{voc}v_i

and the input current is

i_i=\frac{v_i}{R_i}

Thus, we find the transresistance gain as

R_{moc}=\frac{v_{o\mathrm{oc}}}{i_i}A_{voc}R_i=100\mathrm{~k}\Omega 

The resulting transresistance model of the amplifier is shown in Figure 11.17.

11.17

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