Amplifiers (LNA)

1. Conceptual Intuition (L1)

• The megaphone analogy.
• Signal-to-Noise Ratio (SNR) preservation (why the first amp matters).
• Saturation: The ceiling of amplification.

2. Engineering Math (L2)

• Noise Figure ($NF_{dB}$).
• 1dB Compression Point (P1dB).
• Third Order Intercept (IP3) and Intermodulation.
• Friis Formula for cascaded Noise Figure.

3. System Application (L3)

• Stability Circles (Rollet's K-factor) - preventing oscillation.
• Input/Output Matching vs Noise Matching (Optimum Gamma).
• Biasing networks and thermal runaway.

Interactive Component: System Noise Figure Calculator

• Description: Calculate cascaded system performance.
• Controls: Stage Gains, Stage NFs. Shows dominant contributor.