What are the common biasing techniques for MOSFET amplifiers?

Common MOSFET biasing techniques include: Fixed bias (simple but unstable with Vth variations), Self-bias with source resistor (provides negative feedback for stability), Voltage divider bias (sets stable gate voltage, source resistor for further stability), and Current source biasing (best for IC design with current mirrors). For MOSFETs, the goal is to set proper ID and VDS for desired gm while ensuring operation in saturation region. Source degeneration resistor helps stabilize operating point against threshold voltage variations.