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Generalized lock-in amplifier for precision measurement of high frequency signals
Siyuan Fu1, Atsunori Sakurai, Liang Liu
1Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden.
Abstract:
We herein formulate the concept of a generalized lock-in amplifier for the precision measurement of high frequency signals based on digital cavities. Accurate measurement of signals higher than 200 MHz using the generalized lock-in is demonstrated. The technique is compared with a traditional lock-in and its advantages and limitations are discussed. We also briefly point out how the generalized lock-in can be used for precision measurement of giga-hertz signals by using parallel processing of the digitized signals.
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