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:
Feb. 25, 2014
Filed:
Sep. 25, 2012
Colin Lyden, Baltimore, IE;
Donal Bourke, Mallow, IE;
Dennis A. Dempsey, Newport, IE;
Dermot G. O'keeffe, Blarney, IE;
Patrick Kirby, Raheen, IE;
Colin Lyden, Baltimore, IE;
Donal Bourke, Mallow, IE;
Dennis A. Dempsey, Newport, IE;
Dermot G. O'Keeffe, Blarney, IE;
Patrick Kirby, Raheen, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A control circuit for use with a four terminal sensor, the sensor having first and second drive terminals and first and second measurement terminals, the control circuit arranged to drive at least one of the first and second drive terminals with an excitation signal, to sense a voltage difference between the first and second measurement terminals, and control the excitation signal such that the voltage difference between the first and second measurement terminals is within a target range of voltages, and wherein the control circuit includes N poles in its transfer characteristic and N−1 zeros in its transfer characteristic such that when a loop gain falls to unity the phase shift around a closed loop is not substantially 2π radians or a multiple thereof, where N is greater than 1.