INVESTIGADORES
URTEAGA Raul
artículos
Título:
High-Frequency Digital Lock-In Amplifier Using Random Sampling
Autor/es:
M.O. SONNAILLON; RAÚL URTEAGA; FABIÁN J. BONETTO
Revista:
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Referencias:
Año: 2008 vol. 57 p. 616 - 621
ISSN:
0018-9456
Resumen:
A high-frequency digital lock-in amplifier (LIA) thatuses a random-sampling scheme is proposed and tested experimentallyin this paper. By using this sampling strategy, it ispossible to process, without aliasing effects, periodic signals offrequencies that are several times higher than the Nyquist frequency.Analytical and numerical analyses that show the advantagesand limitations of the proposed scheme are presented.A high-frequency digital LIA implementation is also described.The prototype maximum sampling frequency is 150 kHz, and itsmaximum signal frequency without aliasing is 2.5 MHz, limitedonly by the random-sampling period quantization. Experimentalresults that validate the proposal are presented.