The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1989
Filed:
Feb. 27, 1987
Peter G Laws, Swindon, GB;
Plessey Overseas Limited, Ilford, GB;
Abstract
A circuit comprising three stages, a differential input stage, a store and integrate stage, and a differential output stage. Both input and output stages are co-operative with enable/disable switching, which switching is controlled by timing signals provided externally to control the periods of integration and data reading. The store and integrate stage comprises a pair of transistors and individual current sources, charge being integrated by a capacitor connected between the transistors. At the end of each period of integration the capacitor may be discharged via these sources, or, parallel sources and a further switch may be added to allow separate reset and hole period provision. Such circuits may be combined and timed out in phased sequence for fastest operation. They may be incorporated in Costas phase-locked loops and used as a means of communication data recovery.