Title :
Triangularly weighted zero-crossing detector providing ΣΔ frequency-to-digital conversion
Author :
Hovin, M.E. ; Lande, T.S. ; Wisland, D.T. ; Kiaei, S.
Author_Institution :
Dept. of Inf., Oslo Univ., Norway
fDate :
6/19/1997 12:00:00 AM
Abstract :
It is shown that for delta-sigma (ΣΔ) frequency-to-digital conversion (FDC) there is no need for a ΣΔ modulator, since a limited FM signal itself may be considered as an asynchronous ΣΔ bit-stream. By feeding the limited FM signal directly to a sinc2 ΣΔ decimator, a triangularly weighted zero-crossing counter FDC is introduced, providing ΣΔ noise shaping. The results measured confirm the theory
Keywords :
detector circuits; frequency modulation; sigma-delta modulation; ΣΔ frequency-to-digital conversion; ΣΔ noise shaping; asynchronous ΣΔ bit-stream; delta-sigma conversion; limited FM signal; sinc2 ΣΔ decimator; triangularly weighted zero-crossing detector;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19970732
