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:
Aug. 27, 1991
Filed:
Aug. 24, 1989
Applicant:
Inventor:
Kevin B McDonald, Bend, OR (US);
Assignee:
Tektronix, Inc., Beaverton, OR (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ; G06G / ;
U.S. Cl.
CPC ...
307491 ; 356 731 ;
Abstract
An avalanche photodiode non-linearity correction circuit cancels a portion of a non-linear recovery error response by the APD to an input signal by using the fact that the non-linear recovery error is only mildly dependent upon the APD gain. The gain of the APD is varied from data acquisition cycle to data acquisition cycle, with the acquired data being stored. The stored data from consecutive data acquisition cycles are combined in a summation circuit to effectively cancel a significant portion of the non-linear recovery error response.