Symmetric integrated amplifier with controlled dc offset voltage
CA 1289205 C · Owner: American Telephone And Telegraph Company · Inventors: Vella-Coleiro, George Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A symmetric integrated FET amplifier (e.g. 30) is disclosed which exhibits a DC offset voltage that is insensitive to power supply variations as well, as variations in the threshold voltages of the FETs forming the amplifier. These variations are known to be most prevalent in InP-based FET amplifier arrangements. The symmetry is achieved by using a pair of impedance matching elements (e.g. 44, 46) in the input stage of the amplifier to essentially match the impedance of the input FET and its load element; a matching buffer FET (e.g. 48) and diode level shifting arrangement (e.g. 50) are used to match similar elements present in the output branch of the amplifier structure. The …
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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
- Granted September 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2008.
- 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.