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:
Nov. 27, 2001
Filed:
Jul. 07, 1999
Damien McCartney, Limerick, IE;
John O'Dowd, Limerick, IE;
Niall McGuinness, Limerick, IE;
John Keane, Dublin, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A method and circuit for providing a reference voltage to a charge balance circuit. The method includes transferring charge corresponding to V,and charge corresponding to &Dgr;V,to a summing node of the charge balance circuit, where V,is a voltage produced across a p-n junction and where &Dgr;V,is a difference between two V,voltages. With such method, instead of forming a bandgap reference circuit which produces a bandgap reference voltage and applying such voltage to the reference sampling and charge transfer circuit, charge corresponding to V,and charge corresponding to &Dgr;V,are transferred to the input summing node of the modulator in correct proportion and with a polarity corresponding to the modulator output. Thus, the reference sampling and charge transfer circuit delivers V,and &Dgr;V,charge samples to the summing node having the correct proportion and polarity, that in aggregate over a modulator cycle, equal the charge that sampling the reference voltage V,produced by the explicit bandgap reference circuits would deliver.