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:
Mar. 25, 2008
Filed:
Jul. 06, 2006
Fesseha Tessera Seifu, London, GB;
Marco Fornasari, Colchester, GB;
Samir Aboulhouda, Ipswich, GB;
Avago Technologies General IP Pte Ltd, Singapore, SG;
Abstract
A Root Mean Square (RMS) detector circuit includes a first differential pair circuit arranged to operate in a common mode. The detector circuit also includes a compensation circuit unit having a second differential pair circuit to duplicate an unwanted base current drawn by the first differential pair circuit. The compensation circuit unit is arranged to generate an offset voltage using the duplicated base current. The compensation circuit unit also has an operational amplifier coupled to an NMOS transistor so as to generate a corrective current corresponding to the offset voltage, the corrective current being mirrored by a current mirror and provided as a compensatory current to an input of the first differential pair circuit.