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No, a properly implemented lock-in amplifier essentially computes a single-bin Discrete Fourier Transform of the input, measuring energy (and phase) only at the frequency of interest. Of course practical implementations will be slightly "leaky". However, a more crude implementation of a synchronous detector which merely uses the reference signal to ...


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To get started, the NEP is the power of the signal that give you an SNR of 1 (not very useful for communication) at a bandwidth of 1 Hz (Damn slow). To do a quick back of the envelope calculation, pick a bandwidth, close to half your desired data rate, and a desired SNR, and get \$P = SNR \cdot NEP \cdot \sqrt{BW}\$. You will probavly get something higher ...


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The OP is looking for an S/N formula, as per the first paragraph of their statement, and also has a specific question about a nomograph figure they though might be relevant. These two things are addressed separately. Any SNR (aka S/N) formula will necessarily depend on the specific circumstances, e.g., how is the measurement noise distributed, is it ...


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