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. 23, 1999
Filed:
Sep. 09, 1998
Applicant:
Inventor:
Lewis R Carroll, Berkeley, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ; H01J / ;
U.S. Cl.
CPC ...
330277 ; 330308 ; 2502 / ;
Abstract
The input of a source-follower, or equivalent amplifier sub-circuit, utilizing a low-transconductance, low-reverse-leakage, low-capacitance, junction field-effect transistor, with its gate-source junction forward biased, is directly connected to the input of a charge-integrating preamplifier. This provides an attractive alternative to a high-ohm resistor which is typically used as a discharge element in low-noise charge-integrating preamplifiers in nuclear-particle, x-ray, and gamma-ray spectroscopy.