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:
Apr. 02, 2019
Filed:
Sep. 27, 2013
Cristian Pavao-moreira, Frouzins, FR;
Olivier Doare, Mid Pyrenees, FR;
Birama Goumballa, Larra, FR;
NXP USA, Inx., Austin, TX (US);
Abstract
A calibration circuit and a method for calibrating a RC circuit, such as a high-pass filter, of an integrated circuit are provided. The calibration circuit comprises a filter arrangement having tuneable filter for filtering an input signal having a predetermined frequency. The filter comprises tuneable resistor elements, a saturation detector for detecting saturation and non-saturation of the tuneable filter by comparing a comparison voltage with the signal voltage of the filtered input signal, calibration control logic for providing incrementing and decrementing counter signals. The calibration circuit sets the comparison voltage to a first threshold voltage provides iteratively the incrementing counter signal to the filter until saturation is detected reduces the comparison voltage to a predetermined second threshold voltage after saturation is detected, the second threshold voltage being a lower value than the first threshold voltage, and provides the decrementing counter signal to the filter until non-saturation is detected.