Lock-in

Lock-in amplifier on a chip

Lock-in amplifier on a chip
  1. What is lock-in amplifier?
  2. What is phase sensitive detection?

What is lock-in amplifier?

Lock-in amplifiers are used to detect and measure very small AC signalsall the way down to a few nanovolts. Accurate measurements may be made even when the small signal is obscured by noise sources many thousands of times larger.

What is phase sensitive detection?

Phase-sensitive detection is a powerful method for seeing very small signals in the presence of overwhelming noise. Developed in the 1960's, it's become a ubiquitous experimental technique, and the lock-in amplifier1 is the instrument which makes this method possible.

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