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:
Sep. 22, 1992
Filed:
Jan. 03, 1991
Mohammad Yunus, Fremont, CA (US);
Harris Corp., Melbourne, FL (US);
Abstract
A sigma-delta analog-to-digital converter employs multiplexed single-loop modulators in parallel and respectively phased time-divided clocks. The parallel modulators have the effect of producing digital output at a high sampling frequency that is a multiple of the phased switching frequencies applied to the modulator circuits. In one preferred embodiment, four second-order sigma-delta modulators are driven in clocked phased sequence and combined by a multiplexor circuit. Another embodiment employs second-order modulators using RC integrators. A further embodiment replaces the multiplexor with an adder when in-phase modulator clocks are used, and the adder also acts as a simple low pass filter.