Title :
A novel method for detection of aliased frequency components in FFT-based spectrum analysers and digital oscilloscopes
Author :
Baier, J. ; Fürst, H.W.
Author_Institution :
Inst. fuer Elektrische Messtechnik, Tech. Univ. of Vienna, Austria
Abstract :
A new method for detection of aliased frequency components in fast Fourier transform (FFT)-based spectrum analyzers and digital oscilloscopes has been developed. The basic system consists of two analog-to-digital converters (ADCs) working at slightly different sample rates. The frequency components occurring in the resulting spectra are also slightly shifted to each other. By calculating the difference between the two spectra, an aliased frequency component will give a contribution to the difference that a nonaliased component will not
Keywords :
analogue-digital conversion; cathode-ray oscilloscopes; fast Fourier transforms; signal processing equipment; signal sampling; spectral analysers; FFT-based spectrum analysers; aliased frequency components; analog-to-digital converters; digital oscilloscopes; sample rates; Baseband; Difference equations; Digital filters; Discrete transforms; Frequency; Hydrogen; Oscilloscopes;
Conference_Titel :
Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-1281-3
DOI :
10.1109/ISCAS.1993.393835
