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:
Sep. 19, 2000
Filed:
Jun. 04, 1999
John L Vampola, Santa Barbara, CA (US);
Mary J Hewitt, Santa Barbara, CA (US);
Raytheon Company, Lexington, MA (US);
Abstract
An amplifier circuit, referred to as a charge mode capacitor transimpedance amplifier (or CM-CTIA) an input node (IN) and an output node (OUT), and includes a transistor (M.sub.IN) having a gate terminal (G) coupled to the input node, a source terminal (S), and a drain terminal (D) coupled to the output node, a first capacitance (C.sub.FB) coupled between the gate terminal and the drain terminal, a second capacitance (C.sub.S) coupled between the source terminal and a first potential (GND), a third capacitance (C.sub.D) coupled between the drain terminal and the first potential or another fixed potential, a first switch (SW1) coupled between a second potential and the drain terminal, and a second switch (SW2) coupled between a third potential (V.sub.RESET) and the gate terminal. During use, the input node is coupled to an output of a radiation detector, such as a photovoltaic IR detector (12) that forms one element or pixel of an array of IR detectors. An open loop gain of the amplifier circuit is established by a ratio of the value of the second capacitance to the value of the third capacitance, and a transimpedance of the amplifier circuit is established by the value of the first capacitance, the value of the second capacitance, and the value of the third capacitance.