Folded cascode field-effect transistor amplifier with increased gain
CA 1238695 A · Owner: American Telephone And Telegraph Company · Inventors: Saari, Veikko R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A fully differential CMOS operational amplifier (10) of the folded cascode type has a differential input network (12) and a transimpedance stage (14). The transimpedance output stage (14) is made up of two similar negative and positive signal branches (32,24) connected in parallel with each other between supply voltage nodes (V+,V-). Each signal branch includes a P-channel current source transistor (48,60), a cascode transistor (50,62), an N-channel a pull-down transistor (40,52), and an N-channel current source transistor (42,54), all connected in tandem respectively, between a positive supply voltage node and the drain of a feedback transistor (44,56) which has, its source …
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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 June 28, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 2005.
- 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.