Digital phase comparator
CA 1069592 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Clark, Michael A.G.; Underhill, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high gain digital phase comparator which in digital phase lock loop systems can give a thousandfold reduction in ripple and close-in noise sideband amplitudes. The comparator is of the sample-and-hold type but the normal ramp reference waveform is replaced by a waveform with a very steep rising or falling slope. This slope is sampled and its steepness gives the increased gain of the phase comparator. Additional logic and switching circuits are added to make the comparator frequency-sensitive. - 30 -
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
- Granted January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.