Question

The most important advantage in using a MOSFET instead of a BJT at the output is:

1. High input resistance
2. High voltage gain
3. Low output resistance
4. High output signal range

Answer 1

The primary advantage of using a MOSFET over a BJT is its high input resistance, which results in minimal power consumption and avoids loading on previous circuit stages.

Step-by-step explanation:

The most important advantage in using a MOSFET instead of a BJT (Bipolar Junction Transistor) at the output is the high input resistance that MOSFETs offer. This is because a MOSFET is voltage-controlled, where the input impedance is primarily capacitive, and as such, it tends to be orders of magnitude higher than the input impedance of a BJT, which is current-controlled and typically much lower.

The high input resistance of a MOSFET means that it requires very little input current to control the output, making it more efficient in terms of power consumption. This becomes particularly advantageous in applications requiring high speed or dealing with high-impedance signal sources. Moreover, this characteristic ensures minimal loading on the previous stages of an electronic circuit.