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:
Jul. 13, 1999
Filed:
Nov. 06, 1997
Juha Rapeli, Oulu, FI;
Jose De Albuquerque Epifanio Da Franca, Lisbon, PT;
Carlos Mexia De Almeida De Azeredo Leme, Lisbon, PT;
Joao Paulo Zuna Bello, Sacavem, PT;
Pedro Antonio De Sousa Cardoso Lopes, Almada, PT;
Ricardo Dos Santos Reis, Amadora, PT;
Nokia Mobile Phones Limited, Espoo, FI;
Abstract
A charge transfer from signal voltage (U.sub.S) to integrating capacitance (C.sub.O) is accomplished by means of charge transfer capacitance (C.sub.i), an active element (T) and controllable switches (S.sub.61, S.sub.62, S.sub.63, S.sub.64). The operation of the circuit is additionally based on the fact that the charge transfer to the charge transfer capacitance (C.sub.i) is terminated when the transistor (T) is in a current-carrying state and that current flow is ensured by a constant-current element set. These features are combined preferably in such a way that the breaking current of charge transfer is equally great as previously said current of the constant-current element.