D 8.91 Design three Widlar current sources, each having a 100-μA reference current: one with a current transfer ratio of 0.8, one with a ratio of 0.10, and one with a ratio of 0.01, all assuming high β. For each, find the output resistance, and contrast it with r o of the basic unity-ratio source that is providing the desired current and for which RE = 0. Use β = ∞ and VA = 50 V.

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images - D 8.91 Design three Widlar current sources, each having a 100-μA reference current: one with a current transfer ratio of 0.8, one with a ratio of 0.10, and one with a ratio of 0.01, all assuming high β. For each, find the output resistance, and contrast it with r o of the basic unity-ratio source that is providing the desired current and for which RE = 0. Use β = ∞ and VA = 50 V.

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