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Find { v }_{ 0 } in the circuit in Fig. 5.95, assuming that { R }_{ f } = ∞ (open circuit).

Step-by-step

If { R }_{ q} = ∞, the first stage is an inverter.

\mathrm{V}_{\mathrm{a}}=-\frac{15}{5}(10)=-30 \mathrm{mV}

when { V }_{ a } is the output of the first op amp.

The second stage is a noninverting amplifier.

\mathrm{v}_{\mathrm{o}}=\left(1+\frac{6}{2}\right) \mathrm{v}_{\mathrm{a}}=(1+3)(-30)=\underline{-120 \mathrm{mV}}

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