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CA 2045568 A1 · Owner: Huang, Qiuting · Inventors: Huang, Qiuting
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Second order sigma-delta sections are cascaded to form high order A/D converters suitable for CMOS realisation. Compared to the cascade of first order sigma-delta sections approach the new, structure requires less comparators and less complex digital circuits. The structure is also less sensitive to low frequency amplifier noise, which is important at 16-bit resolution level. A fourth-order integration noise shaping sigma-delta A/D converter front end is disclosed capable of achieving 16-bit resolution and converting up to 64kHz baseband signals.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 15, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 15, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.