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:
Dec. 21, 2004
Filed:
Mar. 12, 2003
Glenn A. Mayfield, West Lafayette, IN (US);
Radian Research, Inc., Lafayette, IN (US);
Abstract
A method and apparatus for analog-to-digital (A/D) converting an input signal having a first polarity include providing an integrator including a capacitance coupled to an input port of an amplifier, coupling an A/D converter to an output port of the amplifier, changing the amount of charge stored in the capacitance by coupling the input signal and a reference source having a second and opposite polarity to the capacitance, and controlling an A/D conversion cycle of the A/D converter to simultaneously charge and discharge the capacitance with the input signal and the reference source prior to each A/D conversion cycle. Another method and apparatus for (A/D) converting an input signal include providing an integrator including a capacitance coupled to an input port of an amplifier, coupling an A/D converter to an output port of the amplifier, changing the amount of charge stored in the capacitance at a known time rate by alternately coupling the input signal and a reference source to the capacitance through at least one switch, and controlling an A/D conversion cycle of the A/D converter and the at least one switch for controlling the coupling of the input signal and the reference source to the capacitance.