*7.63 Most practical amplifiers have internal feedback that make them non-unilateral. In such a case, Rin depends on R L. To illustrate this point we show in Fig. P7.63 the equivalent circuit of an amplifier where a feedback resistance R f models the internal feedback mechanism that is present in this amplifier. It is Rf that makes the amplifier non-unilateral. Show that

63 10 - *7.63 Most practical amplifiers have internal feedback that make them non-unilateral. In such a case, Rin depends on R L. To illustrate this point we show in Fig. P7.63 the equivalent circuit of an amplifier where a feedback resistance R f models the internal feedback mechanism that is present in this amplifier. It is Rf that makes the amplifier non-unilateral. Show that

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images - *7.63 Most practical amplifiers have internal feedback that make them non-unilateral. In such a case, Rin depends on R L. To illustrate this point we show in Fig. P7.63 the equivalent circuit of an amplifier where a feedback resistance R f models the internal feedback mechanism that is present in this amplifier. It is Rf that makes the amplifier non-unilateral. Show that

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