Understanding Noise Sources and Measurements: BJT Transistors Explained
Discover the fundamentals of noise sources and measurements in this detailed tutorial! Gregory demonstrates how to use a BJT transistor as a noise source, exploring its configuration with a reverse-biased base-emitter junction and a series of common-emitter amplifiers.
Using a Spectrum Analyzer with a noise marker function, Gregory analyzes circuit output noise, estimating the BJT's Excess Noise Ratio (ENR) by factoring in the noise floor and the amplification gain slope.
Key takeaways include:
Calculating Noise Power Density and Noise Temperature for accurate measurements.
Understanding noise behavior through practical, easy-to-follow steps.
This video is perfect for electronics enthusiasts and professionals looking to deepen their understanding of noise characteristics and measurement techniques.
BJT PN Junction Noise Source
https://gusbertianalog.com/bjt-pn-jun...
Video about Noise Temperature and SNR
• Signal to Noise Ratio, Noise Temperat...
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00:42 - Circuit Overview: Understanding the Measurement Setup
01:32 - Why Measure Noise? The Motivation Behind the Analysis
02:54 - Noise Characteristics: Key Concepts and Behavior
04:14 - Calculating Noise Power Density Explained
05:48 - Reverse-Biased Base-Emitter Junction in BJT Transistors
06:46 - Spectrum Analyzer Basics: Noise Measurement Techniques
08:08 - Role of RBW and Noise Marker in Noise Analysis
11:24 - Automated Noise Measurements for Improved Accuracy
14:54 - Amplifier Gain De-Embedding: Step-by-Step Process
17:10 - Estimating Excess Noise Ratio (ENR) for BJTs
19:00 - Spectrum Analyzer Noise Floor: Correction Techniques
23:04 - Detailed Circuit Description and Configuration
26:04 - Noise Sources: Zener Effect vs. Avalanche Breakdown
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