6.4. Load Coupling Capacitor
The complete practical amplifier includes a load, RL, at the output. This requires an additional coupling capacitor. The amplifier with an attached load is shown in Fig. 6.3. We will assume that the effect of the output resistance, rds, can be neglected. The transistor appears as a current source of magnitude Id. The equivalent signal circuit at the output can be represented as shown in Fig. 6.4(a) and (b). In Figure 6.4(b), the current source and drain resistor are replaced with a voltage-source equivalent. From Fig. 6.4(b), the output voltage is
Equation 6.13
Figure 6.3. Amplifier with capacitively coupled ...
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