The source follower amplifier provides lower output impedance and essentially unity gain. The circuit diagram is shown in Figure P2.20(a), and the small-signal model is shown in Figure P2.20(b).This circuit uses an FET and provides a gain of approximately unity. Assume that R2 >> R1 for biasing purposes and that Rg >> R2.
(a) Solve for the amplifier gain.
(b) Solve for the gain when gm = 2000 μΩ and Rs = 10 kΩ where Rs = R1 + R2.
(c) Sketch a block diagram that represents the circuit equations.

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DO 우- RG R3 FIGURE P2.20 The source follower or common drain amplifier using an FET