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. 13, 1990
Filed:
Oct. 10, 1989
Royal A Gosser, Reidsville, NC (US);
Analog Devices, Incorporated, Norwood, MA (US);
Abstract
An integrated-circuit (IC) transimpedance amplifier having a successive series of DC-coupled balanced symmetrical amplifier stages with overall current feedback. The input stage includes a pair of series-connected NPN/PNP transistor with common emitters serving as the inverting input terminal. The second stage includes a cross-coupled transistor quad with the bases of the first quad pair coupled to the collectors of the first stage transistors. The inter-stage coupling circuit includes a series string of diodes connected between the collectors of the first stage transistor pair. The input stage transistor pair is identical to the transistor pairs of the second stage quad, and all of those transistors carry identical DC currents. An output stage amplifier is driven by a signal from the collectors of the first transistor pair of the second stage quad. The second transistor pair of the quad is coupled to the output stage through current mirrors to augment the output signal.