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:
Dec. 26, 2000
Filed:
Apr. 23, 1999
Edward L Henderson, Atkinson, NH (US);
David B Bell, Los Altos, CA (US);
Linear Technology Corporation, Milpitas, CA (US);
Abstract
The invention provides RF power controllers that cancel offset voltages in the power control loop and external offset voltages by coupling the output of the RF power controller to an auto-zero amplifier during STANDBY mode. The auto-zero amplifier controls the output voltage of the RF power controller during each STANDBY mode so as to eliminate the effect of offset voltages. The voltage at the input of the auto-zero amplifier that allows the offset voltages to be canceled is stored during ENABLE mode. The stored voltage is used by the auto-zero amplifier to continue to remove the effect of the offset voltages on the output voltage of the RF power controller during ENABLE mode. Offset drifts due to temperature, power supply changes, etc. are canceled due to frequent offset sampling.