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. 27, 1994
Filed:
Nov. 03, 1992
Applicant:
Inventors:
Charles D Thompson, Austin, TX (US);
Eric J Swanson, Buda, TX (US);
Assignee:
Crystal Semiconductor Corporation, Austin, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341143 ; 341172 ;
Abstract
The thermal noise generated through the feedback capacitor of a delta-sigma modulator is attenuated by transferring a reference voltage through the capacitor in two separate steps during each sampling period. This permits a reduction in the size of the feedback capacitor, thereby reducing thermal noise, without increasing the voltage on the switching capacitors on the summing node side of the feedback capacitors which would induce degradation due to hot electron effects.