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. 04, 2014
Filed:
Dec. 22, 2009
Andrew David York, Bristol, GB;
Brian Halsall, Bristol, GB;
Gregory Ian Chance, Bristol, GB;
Oxford Instruments Nanotechnology Tools Limited, Oxfordshire, GB;
Abstract
A signal generating system comprises a signal generator () for generating an electrical signal at a predetermined frequency; an impedance matching circuit (), the electrical signal being supplied from the signal generator () via the impedance matching circuit () to a reactive load () in use; and an impedance matching control system () for detecting the electrical signal between the signal generator and the reactive load and for adjusting the impedance matching circuit () to achieve a predetermined condition. The impedance matching circuit control system () comprises a heterodyne circuit, and the system further comprises a heterodyne frequency generator () coupled to the signal generator () to generate a second, heterodyne frequency from the predetermined frequency from the signal generator. This second, heterodyne frequency is mixed with the detected signal to generate sum and difference signals. A filter () passes the difference signal and a processor (Magnitude control; Phase control;) responsive to the difference signal is used to adjust the impedance matching circuit () to achieve the predetermined condition.