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:
Oct. 12, 1993
Filed:
Mar. 19, 1992
Applicant:
Inventor:
Mario Giorgetta, Winterthur, CH;
Assignee:
Kistler Instrumente AG, Winterthur, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330 51 ; 330 85 ;
Abstract
The invention relates to a charge amplifier circuit with a control loop for resetting, which for minimizing the leakage currents that falsify the measuring results includes two diodes (D.sub.1) and (D.sub.2), connected antiparallel in the loop and constituting input protection diodes of an integrated circuit (ISK). In the operating (measuring) phase the diode resistance (R.sub.D) is extremely high and the voltage drop over the diode pair is small, so that no significant leakage current gets through onto the charge amplifier input IN.sub.Q. In the reset phase the diode resistance (R.sub.Dr) is practically nil.