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For large-signal operation of oscillators, it is typically necessary to obtain the large signal device parameters of the active two-port network and calculate the external feedback elements for the circuit –. Figure 1 shows the simplified circuit diagram for a series feedback oscillator comprising the intrinsic transistor, its package parasitics, and the external feedback circuit. Both series and parallel feedback arrangements are common in oscillator circuits . The circuit example shown below is based on the series feedback circuit and accounts for all intrinsic parasitic parameters –.