2.30 The inverting circuit with the T network in the feedback

is redrawn in Fig. P2.30 in a way that emphasizes the

observation that R, and R, in effect are in parallel (because

the ideal op amp forces a virtual ground at the inverting input

terminal). Use this observation to derive an expression for the

gain (v/v) by first finding (v/v,) and (v/v). For the latter

use the voltage-divider rule applied to R, and (R₂ || R.).

110-

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R₁

Figure P2.30

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R₂

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R₁

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R₁

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