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, 2001
Filed:
Oct. 11, 2000
Applicant:
Inventor:
John William Hynd, Williamsville, NY (US);
Assignee:
PCB Piezotronics, Inc., Depew, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 1/36 ;
U.S. Cl.
CPC ...
H03F 1/36 ;
Abstract
A zero input current charge sensitive preamplifier comprised of a feedback means and, optionally, a charge cancellation means whereby the feedback means is comprised of a feedback loop having a feedback capacitor and a composite operational amplifier having a non-inverting input and being comprised of a common drain differential amplifier, having at least one junction field effect transistor which is coupled with a monolithic operational amplifier; and wherein the charge cancellation means is comprised of an integrator placed in the feedback loop at the non-inverting input of the composite operational amplifier.