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:
Aug. 07, 2001
Filed:
Oct. 08, 1998
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A gain ranging AD converter is provided having two separate gain paths. There is provided a low-gain path and a high-gain path. The low gain path is processed through an analog modulator (,) and then through a filter section to provide on an output of a high-pass filter (,), a low-gain signal which is then compensated for in an equalizer section (,). This equalizing section (,) calibrates the output signal to ensure that the difference between the calibrated signal and the high-gain signal differs only by the fixed gain between the two paths. The high-gain path also includes a modulator (,) for processing through a filter section to provide on the output of a high-pass filter section (,) a high-gain signal. A calibration generator (,) is utilized to generate the parameters for performing the equalization. This calibration generator (,) utilizes both phase and amplitude information from the high-gain path and from both the calibrated low-gain path to generate the calibration parameters for use by the equalizing section (,). Thereafter, the mixing operation is performed to provide a “blend” before summing with a summing junction (,).