FET in Digital vs Analog Circuits: A Practical Comparison

Field Effect Transistors (FETs) are widely used in various circuit designs. However, their role and behavior differ significantly depending on whether they’re used in digital or analog circuits. This post provides a side-by-side comparison of how FETs function in each type of circuit, highlighting application differences and design considerations.     1. FET Usage in Digital Circuits In digital circuits, FETs primarily serve as switches. When the gate voltage reaches a certain threshold, the FET turns on (conducts); otherwise, it turns off. This switching property forms the basis for logical operations. CMOS logic, for example, uses NMOS and PMOS pairs to implement gates such as NAND and NOR. Operation: On/Off switching based on gate voltage Main Uses: GPIO control on microcontrollers, logic gates, digital signal routing Features: Fast switching, low power consumption, high integration     2. FET Usage in Analog Circui...