Cascaded internal impedance dependent amplifier with accurate variable gain control
CA 1286735 C · Owner: Hughes Aircraft Company · Inventors: Yang, Steve S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An internal impedance dependent amplifier has a gain as determined by the impedance at a predetermined node within the amplifier. A PIN diode is coupled to the predetermined node. The PIN diode is driven with a forward biased current which serves as the accurate gain control (AGC) signal for the amplifer. In the preferred embodiment, the PIN diode is driven by an operational amplifier in such a manner that the impedance thus coupled to the predetemrined node in the amplifier is temperature independent. Becuase the PIN diode has an impedance given by:, log R = A + B log Ip where, R is the impedance of the PIN diode; Ip is the forward biasing current; and A and B constants which are …
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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 July 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 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.