Differential amplifier using voltage level shifting to achieve rail-to-rail input capability at very low power supply voltage
CA 2009476 C · Owner: Koninklijke Philips Electronics N.V. · Inventors: Huijsing, Johan Hendrik; Maris, Marien George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A differential amplifier coupled between sources of a high supply voltage (V HH) and a low supply voltage (V LL) contains a pair of differential portions (30 and 32) that, are used to amplify a differential input signal (V I1 and V I2). One of the differential portions is turned on when the common-mode voltage of the input signal is in a portion of the supply range extending up to the high supply voltage. The other is turned on when the input common-mode voltage is in a portion of the supply range extending down to the low supply voltage. A level-shift circuit (38 40, 42, 44, and 46) selectively raises or lowers the voltages at input points (P1, P2, P3, and P4) to the differential portions. …
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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 February 7, 1990 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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.