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:
Apr. 14, 1987
Filed:
Sep. 06, 1985
David D Heston, Dallas, TX (US);
Randall E Lehmann, Garland, TX (US);
David J Seymour, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A monolithic low noise variable gain amplifier with series feedback includes a dual gate field effect transistor (DGFET) having a common source FET and a common gate FET with scaled gate widths and/or an interelectrode matching element connected to ground through a capacitor positioned between the two gates for reducing the minimum noise figure of the common gate FET and establishing the output load for the common source FET, and an inductive series feedback line for connecting the common source FET to ground. The amount of series feedback between the source and ground of the DGFET as well as the appropriate output load obtained through gate width scaling are selected to make the conjugate input impedance equal to the optimum impedance for a simultaneous noise match and power match.