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. 03, 2004
Filed:
Feb. 13, 2001
Michael Andrew Krupka, San Diego, CA (US);
Quantum Applied Science and Research, Inc., San Diego, CA (US);
Abstract
An electronic circuit stabilizes an ultrahigh input impedance amplifier by altering the amplifier's input potential. This input potential includes both the desired input signal and the amplifier's input bias current. With an amplifier having an input port and a guard, both the input port and the guard will have the same input potential. Accordingly, the stabilizing circuit of the present invention provides the input potential at the guard to an electronic device which separates the input signal from the input bias current. This creates a corrective signal. The corrective signal is then used through a feedback path to alter the input potential so that the desired input signal can be fed into the amplifier without adverse consequences from the input bias current.