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. 04, 1998
Filed:
Dec. 16, 1996
Motorola, Inc., Schaumburg, IL (US);
Abstract
An analog-to-digital converter is introduced which operates as an oversampled delta-sigma converter. The converter is implemented fully differentially, having doubled integrator capacitors (130, 230), comparators (180, 280), and feedback units (160, 260). In order to reduce the influence of parasitic capacities, the feedback units (160, 260) comprise cascoded switches (171-179). Internal auxiliary signals for controlling the feedback units (160, 260) return to zero at clock frequency. The converter can be used in an integrated signal processing circuit having analog and digital domains on one chip. The capacitors (130, 230) itself are implemented by MOS transistors with the same single poly process as the rest of the circuit. In a second embodiment of the invention, the analog-to-digital converter (500) comprises multiple comparators (580, 572, 573, 574), dynamic matching circuits (801, 802). The comparators (572, 573, 574) can received dithered input signals.