Drain of the MOSFET connected to Vdd, and constant voltage across Vdd of the MOSFET would become small-signal ground. Voltage applied across the gate and source terminals, source of the MOSFET connected to the resistor, and connected to ground. We represent the Common drain amplifier in the form of a small-signal model.įigure 1: Common Drain Amplifier small signal model To determine the voltage gain of the amplifier, we must determine the output voltage over the input voltage. The input resistance is equal to infinity. When the input voltage is zero, the flow of the current is zero. Voltage source VIN connected to the gate, (gm) (vgs) voltage-dependent current source at the source terminal.
To determine the input resistance, apply the test voltage at input and measure the current flowing out of it. Based on these parameters, it provides insight into how the circuit will interact with other components. Let us analyze the input resistance, output resistance, and the gain of the amplifier. The Common drain amplifiers are different from Common source amplifiers where the resistor connected across the drain. The Common drain amplifier is a single transistor MOSFET amplifier, one of the basic fundamental MOSFET amplifiers.
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