Tips: How to Measure LF Noise of Ultra-Low Noise Device
应用文章
Best Solution for LF Noise Measurement
Keysight E4727B (Advanced Low-Frequency Noise Analyzer; A-LFNA) allows you to measure the LF (Low Frequency) noise of semiconductor devices very easily. The E4727B consists of hardware and software. The user can measure LF noise by just entering the expected measurement conditions and the software will then set all parameters of hardware optimally. However, there are some difficulties to measure ultra-low noise devices like JFET. The most important thing to measure the ultra-low noise device is to keep the S/N ratio against to system noise floor. The S/N ratio of E4727B is decided by the following parameters and this document explains how to set these parameters optimally for LF noise measurement of ultra-low noise devices.
• LNA Noise Floor
• SMU Noise Floor
• RLOAD Value