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, 1979
Filed:
Feb. 24, 1978
Applicant:
Inventor:
Joseph F Wrinn, North Quincy, MA (US);
Assignee:
Teradyne, Inc., Boston, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ;
Abstract
Electrical circuitry for measuring low level signals comprising a source of ac signals to be measured, a synchronous detector clocked at the frequency of said ac, and a transformer coupling the source to the detector, improved in that, between the transformer and the detector, there are provided a wideband amplifier for amplifying both the information signal and noise present in the transformer output, followed by a filter having a passband of width intermediate those of the amplifier and the detector and centered on the clock frequency of the detector.