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:
Mar. 07, 2000
Filed:
Sep. 05, 1997
Lawrence D Engh, Redwood City, CA (US);
Jung Sheng Hoei, Newark, CA (US);
Vashal Sarin, Santa Clara, CA (US);
Information Storage Devices, Inc., San Jose, CA (US);
Abstract
AC coupling and signal amplification using switched capacitors. The use of a switched capacitor to simulate a resistor in amplifier coupling in an integrated circuit processing audio frequency signals avoids the need for external components, reducing cost and eliminating the need for pinouts for the external components. In a system including an anti-aliasing filter, capacitive coupling is used for coupling between amplifiers, with the gain of the second amplifier being set by a feedback capacitor between the amplifier output and its input, as sized relative to the coupling capacitor. The switched capacitor in the feedback loop of the second amplifier preferably couples the output of the anti-aliasing filter back to the amplifier input, thereby minimizing the aliasing from the capacitor switching.