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. 03, 1990
Filed:
Jun. 13, 1988
Adrian B Early, Buda, TX (US);
Crystal Semiconductor, Austin, TX (US);
Abstract
A chopper stabilized analog-to-digital converter includes an analog modulator (10) and a digital filter (12). The analog modulator (10) is comprised of two integrators (20) and (22). The first integrator (20) is a chopper stabilized integrator which is comprised of a chopper stabilized differential amplifier (32) and a capacitively switched input. The amplifier (32) is operable to receive a chopping frequency F.sub.CH that is one-half the sampling frequency F.sub.S and synchronized thereto. The amplifier (32) is operable to modulate the noise up to the chopping frequency F.sub.CH, which frequency is in the rejection portion of the filter response for the digital filter (12), thus rejecting 1/f noise.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile