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. 02, 1991
Filed:
Mar. 02, 1990
Charles D Thompson, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An oversampling analog-to-digital converter is responsive to an analog input signal for providing a digital output signal representative of the magnitude of the analog input signal at an output bus. The analog input signal is quantized through a sigma delta modulator stages for providing first and second digital output signals which are recombined through at least first and second digital integrators and at least first and second digital differentiators of a low pass comb filter for providing the digital output signal. The first digital output signal controls the application of either a digital correction signal or digital zeroes to the least significant portion of a predetermined number of accumulator cells of the first digital integrator thereby substituting the digital correction signal for the digital output signal to weight the latter's contribution and compensate for the quantization error which increases the resolution of the digital output signal.