title: Generalized lock-in amplifier for precision measurement of high frequency signals.
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.
authors.affiliation: Department of Electrical and Information Technology, Lund University, Ole Römers väg 3, 22363 Lund, Sweden.
authors.forename: Siyuan
authors.initials: S
authors.lastname: Fu
authors.forename: Atsunori
authors.initials: A
authors.lastname: Sakurai
authors.forename: Liang
authors.initials: L
authors.lastname: Liu
authors.forename: Fredrik
authors.initials: F
authors.lastname: Edman
authors.forename: Tõnu
authors.initials: T
authors.lastname: Pullerits
authors.forename: Viktor
authors.initials: V
authors.lastname: Öwall
authors.forename: Khadga Jung
authors.initials: KJ
authors.lastname: Karki