RF Amplifiers

Function: Amplify radio frequency signals while maintaining signal integrity, gain, bandwidth, and linearity.

Key Parameters

• Gain: Output power vs. input power (dB)
• Noise Figure (NF): Signal-to-noise degradation (lower is better)
• IP3 (Third-Order Intercept): Linearity & distortion performance
• Bandwidth: Frequency range of operation
• P1dB (Compression Point): Output power at 1 dB compression
• VSWR / Return Loss: Impedance matching (typically 50Ω)

Types

Common Technologies

Bipolar (Si, SiGe), GaAs, GaN, CMOS — chosen based on frequency, power, and efficiency needs.

Design Tips

• Impedance match I/O (use Smith Chart)
• Stability check (K-factor, μ-factor)
• Proper biasing (voltage/current regulation)
• Thermal management (especially for PAs)
• Decoupling & layout (minimize parasitics)