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Buffer amplifier
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====Impedance transformation using the MOSFET voltage follower==== Using the small-signal circuit in Figure 5, the impedance seen looking into the circuit is no longer ''R<sub>L</sub>'' but instead is infinite (at low frequencies) because the MOSFET draws no current. As frequency is increased, the parasitic capacitances of the transistors come into play and the transformed input impedance drops with frequency.
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