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:
May. 25, 2010
Filed:
Aug. 01, 2008
Thomas L. Botker, Andover, MA (US);
Thomas L. Botker, Andover, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
An amplifier front-end comprises an input node for receiving a common-mode voltage V, a differential transistor pair having first and second inputs and outputs, a capacitor, a reference voltage V, an error correction circuit, and a switching network. The switching network charges the capacitor to V; couples the capacitor to the differential pair's first input and couples Vto the pair's second input such that the voltage at both inputs is ˜V; and couples the input node to the capacitor's other terminal such that the voltage at the first input is level-shifted to ˜(V+V). The error correction circuit—typically an auto-zero circuit—is coupled to the differential pair's outputs and arranged to reduce charge injection error and kT/C noise components that would otherwise be present in the outputs due to the level shift.