Noise Analysis
Understanding and minimizing electronic noise for high-performance analog circuits.
Electronic noise limits the minimum signal level a circuit can process. Understanding noise sources and how to minimize them is critical for sensitive analog designs like audio preamps and sensor interfaces.
Objectives
- Identify thermal, shot, and flicker noise sources
- Calculate noise voltage and current densities
- Determine signal-to-noise ratio and noise figure
- Design low-noise amplifier input stages
- Apply noise reduction techniques
Key Takeaways
- Thermal noise is proportional to √(resistance × bandwidth)
- Shot noise depends on DC current
- 1/f noise dominates at low frequencies
- Input stage noise contribution is most critical