Generalized lock-in amplifier for precision measurement of high frequency signals

摘要

We herein formulate the concept of a generalized lock-in amplifier for theprecision measurement of high frequency signals based on digital cavities.Accurate measurement of signals higher than 200 MHz using the generalizedlock-in is demonstrated. The technique is compared with a traditional lock-inand its advantages and limitations are discussed. We also briefly point out howthe generalized lock-in can be used for precision measurement of giga-hertzsignals by using parallel processing of the digitized signals.