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:
Sep. 26, 2006
Filed:
Jan. 27, 2005
Michael P. Daly, Wicklow, IE;
Evaldo M. Miranda, Saratoga, CA (US);
David Thomson, Fremont, CA (US);
A. Paul Brokaw, Tucson, AZ (US);
Michael P. Daly, Wicklow, IE;
Evaldo M. Miranda, Saratoga, CA (US);
David Thomson, Fremont, CA (US);
A. Paul Brokaw, Tucson, AZ (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A voltage source includes first and second pn junctions which conduct the outputs of respective current sources to establish respective base-emitter voltages Vand Vat respective nodes; Vand Vcan each be generated with a current I or a current N*I. An amplifier Ahas its non-inverting input connected to the second node and its inverting input connected to the first node through an input capacitor; a feedback capacitor is connected between the inverting input and a third node. Switches are connected between A's inverting input and A's output, between the third node and A's output, and between the third node and a circuit common point. A control circuit operates the switches and current sources during first and second operating phases to selectively produce a temperature independent output voltage or a temperature dependent output voltage.