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. 03, 1991
Filed:
Apr. 06, 1990
James B Beyer, Madison, WI (US);
Joseph W Byrne, Waukesha, WI (US);
Wisconsin Alumni Research Foundation, Madison, WI (US);
Abstract
A highly directive, broadband, bidirectional distributed amplifier has a series of FETs connected between input and output lines which have their effective transconductances scaled in accordance with binomial coefficients along the distributed amplifier to maximize the directivity of the amplifier. Directivities on the order of -25 to -35 dB are obtained over as much as an octave in frequency. The effective binomial scaling may be achieved by insertion of appropriately sized capacitors in the gate lines of each of the FETs. The minimization bandwidth may be shifted to lower frequencies by incorporating passive impedances between the active devices in both the gate and drain lines. These impedances preferably comprise T-section inserts composed of serially connected lumped inductors and a capacitance from the junction between the inductors to ground. The distributed amplifier is bidirectional so that it can be excited from either port on the gate line with high directivity exhibited at each respective port on the drain line.