EP 0607299 A4 19940824 - NMR RECEIVER WITH SIGMA-DELTA A/D CONVERTER.
Title (en)
NMR RECEIVER WITH SIGMA-DELTA A/D CONVERTER.
Publication
Application
Priority
- US 9208491 W 19921006
- US 77336191 A 19911007
Abstract (en)
[origin: WO9307679A1] An NMR receiver (60) utilizing the Sigma-Delta modulation method implemented in the analog-to-digital converter (88) device to enable the use of much simpler analog anti-aliasing filters (86) that have a wider bandwidth. The analog filters do not induce phase distorsion of the signal in the operating frequency and thus eliminates the need for first order phase correction by the digital signal processor. Further, there is no requirement for adjustment in the filters (86) since the digital decimation filter (88) contained within the analog-to-digital converter device (88) acts as a digital lowpass filter.
IPC 1-7
IPC 8 full level
A61B 5/055 (2006.01); G01R 33/32 (2006.01); G01R 33/36 (2006.01); H03M 3/02 (2006.01)
CPC (source: EP)
G01R 33/3621 (2013.01)
Citation (search report)
- [Y] US 5045777 A 19910903 - ITAGAKI HIDENOBU [JP]
- [Y] US 4950999 A 19900821 - AGNELLO ANTHONY M [US], et al
- [Y] H.-J. DRESSLER: "Interpolative Bandpass - A/D - Conversion", SIGNAL PROCESSING. EUROPEAN JOURNAL DEVOTED TO THE METHODS AND APPLICATIONS OF SIGNAL PROCESSING, vol. 22, no. 2, February 1991 (1991-02-01), AMSTERDAM NL, pages 139 - 151, XP000208672
- See references of WO 9307679A1
Designated contracting state (EPC)
BE CH DE DK FR GB IE IT LI LU NL SE
DOCDB simple family (publication)
WO 9307679 A1 19930415; CA 2120746 A1 19930415; EP 0607299 A1 19940727; EP 0607299 A4 19940824; IL 103339 A0 19930315; JP H07502593 A 19950316
DOCDB simple family (application)
US 9208491 W 19921006; CA 2120746 A 19921006; EP 92921798 A 19921006; IL 10333992 A 19921005; JP 50713593 A 19921006