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:
Mar. 17, 1998
Filed:
Jun. 07, 1995
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
This is a monolithic infrared detector readout circuit for a capacitive sensing element 111 wherein a high gain preamplifier 115 is biased by a large bias element 113, e.g. on the order of 10.sup.12 ohms. The output of the preamplifier 115 is band-limited by a low pass single-pole filter 117 having a high value resistive element 119, e.g. on the order of 10.sup.9 ohms, and then is clamped by a clamp circuit 131 to a stable reference in a manner that doubles the amplitude of the signal and minimizes low frequency bias shifts and fixed pattern noise. The output of the clamp circuit 131 is buffered by buffer 123 prior to being multiplexed by row address signals. The output from a multiplex switch 125 is then applied to the column line for output to a video circuit or the like.