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. 09, 2008
Filed:
Sep. 12, 2003
Feng Chen, Plano, TX (US);
Feng Chen, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A sigma-delta modulator includes a discrete time circuit that receives a digital feedback signal and an input signal, where the input signal includes information and one or more analog input currents. The discrete time circuit converts the digital feedback signal into an analog feedback signal during a first discrete time and sums the analog feedback signal and the one or more analog input currents during a second discrete time to yield one or more summed signals. A continuous time circuit includes passive elements, is coupled to the discrete time circuit, and operates to filter the one or more summed signals using a first-order filter and a second-order filter in order to generate one or more filtered signals. A quantizer is coupled to the continuous time circuit and generates the digital signal using the one or more filtered signals, where the digital signal comprising the information.